Yaesu Musen 20533X20 VHF Amateur Radio with Scanning Receiver User Manual Operating Manual

Yaesu Musen Co., Ltd. VHF Amateur Radio with Scanning Receiver Operating Manual

USERS MANUAL

VHF FM TRANSCEIVERFT-252Operating ManualYAESU MUSEN CO., LTD.Tennozu Parkside Building2-5-8 Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-0002 JapanYAESU USA6125 Phyllis Drive, Cypress, CA 90630, U.S.A.YAESU UKUnit 12, Sun Valley Business Park, Winnall CloseWinchester, Hampshire, SO23 0LB, U.K.YAESU HKUnit 2002, 20/F, 9 Chong Yip Street,Kwun Tong, Kowloon, Hong KongFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
ContentsScanning ............................................................29VFO Scanning ...............................................30Manual VFO Scan .....................................30Programmed VFO Scan ............................. 30Memory Scanning ..........................................31How to Skip (Omit) a Channelduring Memory Scan Operation ................31Preferential Memory Scan .........................32Memory Bank Scan ...................................33Programmable (Band Limit) Memory Scan(PMS) .............................................................34“Priority Channel” Scanning(Dual Watch) ..................................................35Automatic Lamp Illumination on Scan Stop ..................................................37Band Edge Beeper .........................................37Weather Alert Scan ........................................38Emergency Channel Operation ......................39Smart Search Operation ..................................40ARTS (Automatic Range Transponder System)  ........41DTMF Operation .............................................44Miscellaneous Settings .....................................47Password ........................................................47Changing the Channel Steps ..........................48Receive Battery Saver Setup .........................48TX Battery Saver ...........................................49Transmitter Time-Out Timer (TOT) ..............49Busy Channel Lock-Out (BCLO) ..................50DCS Code Inversion ......................................50Changing the TX Deviation Level .................51Reset Procedures ..............................................52Set Mode ...........................................................53Specications ....................................................63General Description ...........................................1Accessories & Options .......................................2Controls & Connections ....................................3Top & Front Panel ...........................................3LCD .................................................................4Installation of Accessories .................................5Antenna Installation .........................................5Installation of FNB-124LI Battery Pack..........5Battery Charging ..............................................6Low Battery Indication ....................................6Belt Clip Installation ........................................7Operation ............................................................8Switching Power On and Off ...........................8Adjusting the Audio Volume Level .................8Squelch Adjustment .........................................8Frequency Navigation ......................................9Transmission ..................................................10Advanced Operation ........................................ 11Keyboard Locking .........................................11LCD Illumination...........................................12Disabling the Keypad Beeper ........................12RF Squelch.....................................................13Checking the Battery Voltage ........................13Repeater Operation..........................................14Repeater Shifts ...............................................14Automatic Repeater Shift (ARS) ...................14Manual Repeater Shift Activation .................15CTCSS/DCS Operation ...................................17CTCSS Operation ..........................................17DCS Operation...............................................18Tone Search Scanning .................................... 19CTCSS/DCS Bell Operation..........................20Split Tone Operation ......................................21Tone Calling (1750 Hz) .................................21Memory Mode ..................................................22Memory Storage ............................................22Storing Independent Transmit Frequencies (“Odd Split”) ..........22Memory Recall ..............................................23HOME Channel Memory ..............................23Labeling Memories ........................................24Memory Offset Tuning ..................................25Deleting Memories ........................................26Memory Bank Operation ...............................26Moving Memory Data to the VFO ................27Memory Only Mode ......................................27Weather Broadcast Channels .........................28FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 1General DescriptionThe FT-252 is a compact, high-performance FM hand-held providing up to ve watts of RF power and wealth of convenient features for the 2-meter amateur band.Additional  features  include  a  transmit Time-Out  Timer  (TOT), Automatic  Power-Off (APO), Automatic Repeater Shift (ARS), YAESU’s exclusive ARTS™ (Auto-Range Transponder  System) which “beeps” the user when you move out of communications range with another ARTS™ equipped  station. And  an  RF squelch circuit allows  the owner to set the squelch to open at a programmable setting of the S-Meter, thus reduc-ing guesswork in setting the squelch threshold.We appreciate your purchase of the FT-252, and encourage you to read this manual thoroughly, so as to learn about the many exciting features of your exciting new YAESU hand-held transceiver! FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual2Supplied Accessories FNB-124LI  7.4 V  Rechargeable Lithium-Ion Battery Pack YHA-75 Antenna SAD-11B  AC Wall Charger (100 - 120 VAC, Typ-A plug) CD-57  Charger Cradle  Belt Clip  Operating Manual  Warranty CardAvailable Options FNB-124LI  7.4 V Rechargeable Lithium-Ion Battery Pack SAD-11B/C/U  AC Wall Charger CD-57  Charger Cradle CN-3  BNC-to-SMA Adapter:  “B” sufx is for use with 100-120 VAC, “C” and “U” sufx is for use with 230-240 VAC.Availability of accessories may vary. Some accessories are supplied as standard per lo-cal requirements, while others may be unavailable in some regions. This product is de-signed to perform optimally when used with genuine YAESU accessories. YAESU shall not be liable for any  damage to this product and/or accidents such as  re, leakage or explosion of a battery pack, etc., caused by the malfunction of non- YAESU accessories. Consult your YAESU dealer for details regarding these and any newly-available options. Connection of any non-YAESU-approved accessory, should it cause damage, may void the Limited Warranty on this apparatus.Accessories & OptionsFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 3  Antenna Jack  Connect the supplied rubber ex antenna (or an-other antenna presenting a 50-Ohm impedance) here. DIAL Knob  The main tuning Dial is used to set the operating frequency,  and  is  also  used  for  menu selections and other adjustments. Speaker  The internal speaker is located here. PTT (Push To Talk) Switch  Press  this  switch  to transmit, and release it (to receive) after your transmission  is completed.  LCD (Liquid Crystal Display)  The display shows the current operating conditions, as described on the next page. Keypad  These 9 keys select many of most important operating features on the FT-252. MIC  The internal microphone is located here. EXT DC Jack  This  coaxial DC  jack  allows connection to an external DC power  source  (5-10V  DC). The center pin  of  this  jack  is the Positive (+) connection.Do not allow the FT-252 to become sub-merged in water while the rubber cap over the EXT DC jack is removed.Controls & Connectors FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual4Controls & Connectors (LCD)Operating FrequencyBUSY IndicatorTX IndicatorMemory Channel NumberS- & PO MeterSkip Memory Channel or Pref-erential Memory ChannelRepeater Shift DirectionCTCSS/DSC OperationKey Lock ActiveBell Alarm ActiveBattery Saver ActiveDual Watch ActivePriority ChannelBattery IndicatorMemory Bank ActiveLow TX Power SelectedAutomatic Power-Off ActiveDTMF Autodial ActiveSecondary Keypad ActiveFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 5Antenna InstallationThe supplied antenna provides good results over the entire frequency range of the trans-ceiver. However, for enhanced reception on certain non-Amateur frequencies, you may wish to connect an antenna designed specically for that fre-quency range,  as the  supplied antenna  is necessarily  a com-promise outside the Amateur band, and cannot be expected to provide high performance at all frequencies.To install the supplied antenna, hold the bottom end of the an-tenna, then screw it onto the mating connector on the transceiv-er until it is snug. Do not over-tighten by use of extreme force.Notes:  Never transmit without having an antenna connected.  When installing the supplied antenna, never hold the upper part of the antenna while screwing it onto the mating connector on the transceiver.  If using an external antenna for transmission, ensure that the SWR presented to the transceiver is 1.5:1 or lower, to avoid excessive feedline loss.Installation of FNB-124LI Battery PackThe FNB-124LI  is  a high  performance  Li-ion battery  providing  high capacity  in  a compact package. Recharging can be provided while the pack is installed inside the FT-252.Installation of the battery is easy and quick:  Open the Battery Cover Latch on the Battery Cover, then remove the Battery Cover from the radio while pulling the top side of the Battery Cover.  Connect the  3-pin connector from the Battery  pack to the battery jack on the transceiver.   Install the FNB-124LI Battery Pack into the radio.  Install  the Battery Cover by carefully  aligning  the two  tabs  on  the  bottom  of the  cover  with  the  slots on the radio, then gently press the top side of the Battery Cover. Conrm that a Rubber Gasket of the Battery Cover is installed correctly.  Close the Battery Cover Latch until it locks in place with a “Click”.Caution:To insure the FT-252  will  not  have a  problem  with water intrusion, make sure the battery cover is properly installed and the battery latch is closed.Installation of AccessoriesFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual6Battery ChargingIf the battery has never been used, or its charge is depleted, it may be charged by con-necting the SAD-11B  Overnight  Battery  Charger,  as  shown  in  the  illustration,  to  the EXT DC jack. If only 12 ~ 16 Volt DC power is available, the optional E-DC-5B DC Cable (with its cigarette lighter plug) or  E-DC-6 DC Cable (plug and wire only)  may also be used for charging the battery.The display will blink “CHG.ING”, while the battery is being charged. When charging is nished, the “CHG.ING” disappears in the display.A  fully-discharged pack will  be  charged completely  in  5  hours.  Disconnect the SAD-11B from the EXT DC jack and the AC line outlet.Installation of AccessoriesImportant Note The SAD-11B is not designed to power the transceiver for operation (reception or transmission).  Please be advised that the SAD-11B may contribute noise to TV and radio reception in the immediate vicinity, so we do not recommend its use adjacent to such devices.Low Battery IndicationWhen the battery  charge is  almost  depleted, a “ ” icon will  appear  on the display. When the “ ” icon appears, it is recommended that you charge the battery soon.No Icon: Enough Battery Power: Lower Battery Power (Blinking):  Prepare to charge (or replace) the BatteryFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 7Belt Clip Installation / RemovalInstallation of Accessories To install the Belt Clip:  Align  the  Belt  Clip  to  the  groove above  the Battery compartment, then press  the  Belt  Clip  downward  until  it locks in place with a “Click”.  To remove the Belt Clip:  Press the Belt Clip tab away from the transceiver  to  unlock  the  Belt  Clip, then slide the Belt Clip up-ward to re-move it.Belt Clip TabFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual8Switching Power ON and OFF  Be sure the Battery Pack is installed, and that the battery is fully charged. Connect the antenna to the top panel ANTENNA jack.  Press and hold the [POWER] key for two seconds to turn on the radio The current DC supply voltage will be indicated on the display for 2 seconds. After this 2 second interval, the display will resume its normal indication of the operating frequency.  To turn the radio off, press and hold the [POWER] key for two seconds.Adjusting the Audio Volume LevelPress the [VOL/SQL] key to enter the receiver audio adjustment mode. When “VOL” is displayed, rotate the DIAL knob or press the [p]/[q] key until the noise or audio from the speaker is at a comfortable level.Squelch AdjustmentPress the [VOL/SQL] key twice to enter the squelch level adjustment mode. When “LVL” is displayed, rotate the DIAL knob or press the [p]/[q] key to set the Squelch so that the backgroundnoise is just silenced. This state is known as the “Squelch Threshold”.1)  A special “RF Squelch” feature is provided on this radio. This feature allows you to set the squelch so that only signals exceeding a certain S-meter level will open the squelch. See page 13 for details.2)  If you’re operating in an area of high RF pollution, you may need to consider “Tone Squelch” operation using the built-in CTCSS Decoder. This feature will keep your radio quiet until a call is received from a station sending a carrier which contains a matching (subaudible) CTCSS tone. Or, if your friends have radios equipped with DCS (Digital Coded Squelch) like your FT-252 has, try using that mode for silent monitoring of busy channels.OperationFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 9OperationFrequency NavigationThe FT-252 will initially be operating in the “VFO” mode, a channelized system which allows free tuning throughout the operating band.Two basic frequency navigation methods are available on the FT-252:1) Tuning DialRotation of the DIAL  allows  tuning  in  the  pre-programmed  steps  established  for  the operating band. Clockwise rotation of the DIAL causes the FT-252 to be tuned toward a higher frequency, while counter-clockwise rotation will lower the operating frequency.If you press the [F/W] key momentarily, then rotate the DIAL, frequency steps of 1 MHz will be selected. This feature is extremely useful for making rapid frequency excursions over the wide tuning range of the FT-252.2) ScanningPress and hold in either the [p] or [q] key for one second to initiate upward or down-ward scanning, respectively (Manual VFO Scan).If you wish to reverse the direction of the scan (i.e. toward a lower frequency, instead of a higher frequency),  just  rotate  the DIAL  one  click  in the counter-clockwise direc-tion while the FT-252 is scanning. The scanning direction will be reversed. To revert to scanning toward a higher frequency once more, rotate the DIAL one click clockwise.The scanner will  stop  when  it receives a  signal  strong  enough  to break through  the Squelch threshold. The FT-252 will then hold on that frequency according to the setting of the “RESUME” mode (Set Mode Item 31: RESUME). Press the PTT switch momen-tarily to cancel the scanning. This only stops the scan; it does not cause transmission to occur. See page 29 for details regarding Scan Operation.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual10TransmissionOnce you have set up an appropriate frequency inside the 144 MHz Amateur  band on which the FT-252 can transmit, you’re ready to go on the air! These are the most basic steps; more advanced aspects of transmitter operation will be discussed later.  To transmit, press the PTT switch, and speak into the front panel microphone (located in the lower right-hand corner of the speaker grille) in a normal voice level. The “TX” indicator will appears on the LCD during transmission.  To return to the receive mode, release the PTT switch.  During transmission,  the relative power level will be indicated  on the  bar graph at the bottom of the LCD; full scale deection conrms “High Power”  operation,  while  deection  of two  bars  indicates “Low Power” operation. Six bars indicate “Medium Pow-er”  operation. Additionally, the “LOW”  icon  will  appear at  the  display  while  operating on the “Low Power” and “Medium Power” settings.1)  If you’re just talking to friends in the immediate area, you’ll get much longer battery life by switching to Low Power operation, described in the next chapter. And don’t forget: always have an antenna connected when you transmit.2)  Transmission is possible only on the 144 MHz amateur band.Changing the Transmitter Power LevelTo change the power level:  Press the [H/L] key. The LCD shows the current power output level.  Rotate the DIAL knob or press the [p]/[q] key to select the desired power output level. Available selections are “HIGH” (5 W), “MID” (2 W), and “LOW” (0.5 W).  When you have made your choice, press the PTT switch to save the new setting and return to normal operation.1)  The FT-252 is smart! When you store memories, you can store the power output settings separately in each memory, so you don’t waste battery power when using very close-in repeaters!2)  When you are operating on the “Low” or “Medium” power setting, you can press the [F/W] key, then press the PTT switch, to cause the FT-252 to transmit (tem-porarily) on High power. After one transmission, the power level will revert to the previously-selected (“Low” or “Medium” power) setting.Operation“Low” Power“Mid” Power“HigH” PowerFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 11Advanced OperationNow that you’re mastered the basics of FT-252 operation, let’s learn more about some of the really neat features.Keyboard LockingTo activate the locking feature, prees the [F/W] key, then press the [POWER] key.The “ ” icon  will appear  on the  LCD. To  cancel locking prees the [F/W] key, then press the [POWER] key.In  order  to  prevent  accidental  frequency change or  inadver-tent transmission, various aspects of the FT-252’s DIAL and keypad may be locked out. You may change the lockout combinations.To lock out some or all of the keys:1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 24: LOCK.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the  DIAL knob or press the  [p]/[q] key to  the desired  locking scheme as listed below:  LK KEY:  Just the front panel keypad is locked out LKDIAL: Just the top panel DIAL is locked out  LK K+D: Both the keypad and DIAL are locked out (factory default)  LK PTT: The PTT switch is locked out (TX not possible)  LK P+K: Both the PTT switch and keypad are locked out  LK P+D: Both the PTT switch and DIAL are locked out  LK ALL:  All of the above are locked out5.  When you have made your selection, press the PTT switch to save the new setting and return to normal operation.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual12LCD IlluminationYour  FT-252 includes a reddish  illumination  lamp  which  aids  in  nighttime  operation. The reddish illumination yields clear viewing of the display in a dark environment, with minimal degradation of your night vision.Three options for activating the lamp are provided:KEY Mode:  Illuminates the LCD lamp for ve seconds when you rotate the DIAL knob or press the keypad or any switch (except PTT switch). This is the factory-programmed default setting.CONT Mode:  Illuminates the LCD lamp continuously.OFF Mode:  Disables the LCD lamp.Here is the procedure for setting up the Lamp operating mode:1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 23: LAMP.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the DIAL knob or press the [p]/[q] key to select one of the three modes de-scribed above.5.  When you have made your choice, press the PTT switch to save the new setting and return to normal operation.Disabling the Keypad BeeperA keypad beeper provides useful audible feedback whenever a keypad is pressed.If you want to turn the beep off:1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 9: BEEP.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the DIAL knob or press the [p]/[q] key to change the setting to “OFF.”5.  Press the PTT switch to save the new setting and return to normal operation.6.  To turn the beep back on again, select “KEY” or “KEY+SC (factory default)” in step 4 above. KEY:          The beeper sounds when you press the keypad. KEY+SC:   The  beeper sounds  when  you press  the keypad, or  when  the scanner stops.Advanced OperationFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 13Advanced OperationRF SquelchA special RF Squelch feature is provided on this radio. This feature allows you to set the squelch so that only signals exceeding a certain S-meter level will open the squelch. To set up the RF squelch circuit for operation, use the following procedure:1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 33: RF SQL.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the DIAL knob or press the [p]/[q] key to select the desired signal strength level for the squelch threshold (S-1, S-2, S-3, S-4, S-5, S-7, S-FULL, or OFF).5.  Press the PTT switch to save the new setting and return to normal operation.Checking the Battery VoltageThe  FT-252’s  microprocessor  includes programming which will measure the current battery voltage.1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to to se-lect Set Mode Item 14: DC VLT.3.  Press the [F/W] key momentarily  to  display the current DC voltage being supplied.4.  Press the [F/W] key, followed by the PTT switch to return to normal operation.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual14Repeater OperationRepeater stations, usually located on mountaintops or other high locations, provide a dramatic extension of  the communication range  for low-powered hand-held  or mobile transceivers. The FT-252 includes a number of features which make repeater operation simple and enjoyable.Repeater ShiftsThe FT-252 has been congured, at the factory, with the repeater shift set to 600 kHz.Depending on  the part  of  the band in which you are  operating,  the  re-peater shift may be either downward (–)  or upward (+), and one of  these icons  will appear  at  the top  of  the LCD when repeater shifts have been enabled.Automatic Repeater Shift (ARS)The FT-252 provides a convenient Automatic Repeater Shift feature, which causes the appropriate repeater shift to be applied automatically whenever you tune into the desig-nated repeater sub-bands in your country. These sub-bands are shown below.If the ARS feature does not appear to be working, you may have accidentally disabled it.To re-enable ARS: 1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 6: ARS.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the DIAL knob or press the [p]/[q] key to select “ARS. ON”.5.  When you have made your selection, press the PTT switch to save the new setting and return to normal operation.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 15Repeater OperationManual Repeater Shift ActivationIf the ARS feature has been disabled, or if you need to set a repeater shift direction other than that established by the ARS, you may set the direction of the repeater shift manually.To do this:1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 34: RPT.MOD.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate  the DIAL  knob  or  press  the  [p]/[q]  key  to  select  the desired  shift  among “RPT.–”, “RPT.+”, and “RPT.OFF.”5.  When you have made your selection, press the PTT switch to save the new setting and return to normal operation.If you make a change in the shift direction, but still have Automatic Repeater Shift still engaged (see previous section), when you change frequency (by rotating the DIAL knob, for example) the ARS will over-ride your manual setting of the shift direction. Turn ARS off if you do not wish this to happen.If you make a change in the repeater shift on a memory channel that you already stored, the  radio  will  consider  this  a  “temporary”  change  unless  you store the memory  once more, this time with the desired repeater shift engaged.Changing the Default Repeater ShiftsIf you travel to a different region, you may need to change the default repeater shift so as to ensure compatibility with local operating requirements.To do this, follow the procedure below:1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 30: R SHIFT.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the DIAL knob or press the [p]/[q] key to select the new repeater shift mag-nitude.5.  When you have made your selection, press the PTT switch to save the new setting and return to normal operation.If you just have one “odd” split that you need to program, don’t change the “default” repeated shifts using this Set Mode Item. Enter the transmit and receive frequencies separately, as shown on page 22.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual16Checking the Repeater Uplink (Input) FrequencyIt often is helpful to be able to check the uplink (input) frequency of a repeater, to see if the calling station is within direct (“Simplex”) range.To do this, just press the [REV] key. You’ll notice that the  display  has  shifted  to  the repeater  uplink  frequency.  Press  the  [REV]  key  again  to  cause  operation  to  revert  to normal monitoring of the repeater downlink (output) frequency. While you are listening on the input frequency to the repeater using the [REV] key, the repeater offset icon will blink.The conguration of this key may be set either to “REV” (for checking the input fre-quency of a repeater), or “HOME” (for instant switching to the “Home” channel for the band you are operating on). To change the conguration of this key, use Set Mode Item 32: REV/HM. See page 59.Repeater OperationManual Repeater Shift ActivationFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 17CTCSS/DCS OperationCTCSS OperationMany repeater systems  require that a  very-low-frequency audio tone  be  superimposed on your FM carrier in order to activate the repeater. This helps prevent false activation of the repeater  by radar or  spurious  signals from  other  transmitters. This  tone system, called “CTCSS” (Continuous Tone Coded Squelch System), is included in your FT-252, and is very easy to activate.1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 42: SQL.TYP.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the DIAL  knob  or  press  the  [p]/[q]  key so that “TONE”  indication  appears  on  the  display;  this  activates the  CTCSS  Encoder, for access to repeaters requiring a CTCSS tone.5.  Rotation  of  the DIAL  knob  one more  “click”  or press the [p]/[q] key one more “press” in step “4” above will cause  the “TSQL” notation to  appear. When  “TSQL”  is displayed, this means that the Tone SQuelch system is ac-tive, which mutes your FT-252’s receiver until it receives a call from another radio sending out a matching CTCSS tone. This can help keep your radio quiet until a spe-cic call is received, which may be helpful while operating in congested areas of the band.1)  You  may  notice  a  “REV  TN”  indication  on  the  display  while  you  rotate the DIAL knob in this step; this means that the Reverse Tone Squelch system is active, which mutes your FT-252’s receiver (instead of opening the squelch) when it receives a call from the radio sending a matched CTCSS tone. The  “  ” icon will blink on the display when the Reverse Tone Squelch system is activated.2)  You may notice the “DCS” indications on the display while you rotate the DIAL knob still more. We’ll discuss the Digital Code Squelch system (for “DCS”) later.6.  When you have made your selection of the CTCSS tone mode, press the PTT switch to save the new setting.7.  Press the [SET] key to enter the Set mode.8.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 44: TN FRQ.9.  Press the [F/W] key momentarily to enable adjustment of this Item.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual1810. Rotate the DIAL knob until the display indicates the Tone Frequency you need to be using (ask the repeater owner/operator if you don’t know the tone frequency).11. When  you have  made your selection, press the [F/W] key, then press the PTT switch to  save the new settings  and exit to normal operation. This is differ-ent than the usual method of restoring normal operation, and it applies only to the configuration  of  the CTCSS/DCS frequencies.Your repeater may or may not re-transmit a CTCSS tone - some systems just use CTCSS to control access to the repeater, but don’t pass it along when transmitting. If the S-Meter deects, but the FT-252 is not passing audio, repeat steps “1” through “4” above, but rotate the DIAL so that “TSQ” disappears - this will allow you to hear all trafc on the channel being utilized.DCS OperationAnother  form  of  tone  access  control  is  Digital  Code  Squelch, or DCS. It  is  a  newer, more advanced tone  system  which generally provides  more  immunity from false  pag-ing  than does CTCSS. The  DCS  Encoder/Decoder is built into your  FT-252, and op-eration is very similar to that just  described for CTCSS. Your repeater system may be congured for DCS; if not, DCS is frequently quite useful in Simplex operation if your friend(s) use transceivers equipped with this advanced feature.Just as in CTCSS operation, DCS requires that you set the Tone Mode to DCS and that you select a tone code.1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 42: SQL.TYP.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the DIAL  knob  or  press  the  [p]/[q]  key so that “DCS” indication appears on the display; this activates the DCS Encoder/Decoder.5.  Press the PTT switch to save the new setting.6.  Press the [SET] key to enter the Set mode.7.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 15: DCS.COD.CTCSS OperationCTCSS/DCS OperationCTCSS TONE FREQUENCY (Hz)    67.0    69.3    71.9    74.4    77.0    79.7    82.5    85.4    88.5    91.5    94.8    97.4 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 159.8 162.2 165.5 167.9 171.3 173.8 177.3 179.9 183.5 186.2 189.9 192.8 196.6 199.5 203.5 206.5 210.7 218.1 225.7 229.1 233.6 241.8 250.3 254.1 – – – –FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 19DCS CODE 023 025 026 031 032 036 043 047 051 053 054 065 071 072 073 074 114 115 116 122 125 131 132 134 143 145 152 155 156 162 165 172 174 205 212 223 225 226 243 244 245 246 251 252 255 261 263 265 266 271 274 306 311 315 325 331 332 343 346 351 356 364 365 371 411 412 413 423 431 432 445 446 452 454 455 462 464 465 466 503 506 516 523 526 532 546 565 606 612 624 627 631 632 654 662 664 703 712 723 731 732 734 743 754 – – – – – –CTCSS/DCS Operation8.  Press the [F/W] key momentarily to enable adjustment of this Item.9.  Rotate  the  DIAL  knob  to  select  the desired DCS Code (a three-digit num-ber). Ask the repeater owner/operator if you don’t know DCS Code; if you are working  simplex,  just  set  up  the  DCS Code  to  be the same as  that  used  by your friend(s).10. When  you have  made  your selection, press the [F/W] key, then press the PTT switch to save the new settings and exit to normal operation.Remember that the DCS is an Encode/Decode system, so your receiver will remain muted until a matching DCS code is received on an incoming transmission. Switch the DCS off when you’re just tuning around the band!Tone Search ScanningIn operating  situations where you don’t know the CTCSS or  DCS tone  being used  by another station or stations, you can command the radio to listen to the incoming signal and scan in search of the tone being used. Two things must be remembered in this re-gard:  You must be sure that your repeater uses the same tone type (CTCSS vs. DCS).  Some repeaters do not pass the CTCSS tone; you may have to listen to the station(s) transmitting on the repeater uplink (input) frequency in order to allow Tone Search Scanning to work.To scan for the tone in use:1.  Set the radio up for either CTCSS or DCS Decoder operation (see the previous dis-cussions). In the case of CTCSS, “  ” will appear on the display; in the case of DCS, “   ” will appear on the display.2.  Press the [SET] key to enter the Set mode.3.  Rotate  the  DIAL knob or press  the  [p]/[q]  key to select  Set  Mode  Item  44:  TN FRQ or 15: DCS.COD. 4.  Press the [F/W] key,  then press  and hold in the [p] or [q] key for  one second to start scanning for the incoming CTCSS or DCS tone/code.5.  When the radio detects the correct tone or code, it will halt on that tone/code, and audio will be allowed to  pass. Press the  [F/W] key to  lock in  that tone/code, then press the [F/W] key again to exit to normal operation.DCS OperationFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual20If the Tone Scan feature does not detect a tone or code, it will continue to scan inde-nitely. When this happens, it may be that the other station is not sending any tone. You can press the PTT switch to halt the scan at any time.Tone Scanning works either in the VFO or Memory modes.CTCSS/DCS Bell OperationDuring CTCSS Decode or DCS operation, you may set up the FT-252 such that a ring-ing “bell” sound alerts you to the fact that a call is coming in. Here is the procedure for activating the CTCSS/DCS Bell:1.  Set  the  transceiver up for  CTCSS  Decode  (“Tone  Squelch”)  or  DCS  operation,  as described previously.2.  Adjust the operating frequency to the desired channel.3.  Press the [SET] key to enter the Set mode.4.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 10: BELL. 5.  Press the [F/W] key momentarily to enable adjustment of this Item.6.  Rotate the DIAL knob or press the [p]/[q] key to set the desired number of rings of the Bell. The available choices are “1 T,” “3 T,” “5 T,” or “8 T” rings, CONT (continuous ringing), or OFF.7.  Press the PTT switch momentarily to save the new setting and exit to normal operation.When you are called by a station whose transceiver is sending a CTCSS tone or DCS code which matches that set into your Decoder, the Bell will ring in accordance with this program-ming. When the CTCSS/DCS Bell is activated, the “ ” icon will appear at the upper right corner on the LCD.CTCSS/DCS OperationFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 21Split Tone OperationThe FT-252 can be operated in a Split Tone conguration via the Set mode.1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 41: SPLIT.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the DIAL  knob or press  the  [p]/[q]  key  to  select ON (to  enable  the  Split Tone feature).5. Press the PTT switch momentarily to save the new setting and exit to normal operation.When the  Split Tone  feature is  activated, you can see the  following additional  param-eters following the “DCS” parameter (while selecting the tone mode by Set Mode Item 42: SQL.TYP):D:  DCS Encode only (the “   ” icon will appear during operation)T DCS:  Encodes a CTCSS Tone and Decodes a DCS code  (the “ ” icon will blink and the “  ” icon will appear during operation)D TSQL: Encodes a DCS code and Decodes a CTCSS Tone (the “ ” icon will appear and the “ ” icon will blink during opera-tion)Select the desired operating mode from the selections shown above.Tone Calling (1750 Hz)If  the  repeaters  in  your  country require a  1750-Hz  burst  tone  for  access  (typically in Europe), you can set the [VOL/SQL] key to serve as a “Tone Call” switch instead. To change the conguration of this switch, we again use the Set Mode to help us.1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 25: M/T-CAL.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the DIAL knob or press the [p]/[q] key to select “T-CALL” on the display.5.  Press the PTT switch to save the new setting and exit to normal operation.To access a repeater, press and hold in the [VOL/SQL] key for the amount of time speci-ed by the repeater owner/operator. The transmitter will automatically be activated, and a 1750-Hz audio tone will be superimposed on the carrier. Once access to the repeater has  been  gained, you may release the [VOL/SQL]  key  for activating the transmitter thereafter.CTCSS/DCS OperationFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual22Memory ModeThe FT-252 provides a wide variety of memory system resources. These include:  200 “Standard” memory channels, numbered “1” through “200.”  A “Home” channel, providing storage and quick recall of one prime frequency.  10 sets of band-edge memories, also known as “Programmable Memory Scan” chan-nels, labeled “L1/U1” through “L10/U10.”  10 Memory Banks, labeled “BANK 1”  through  “BANK10.”  Each  Memory  Bank can be assigned up to 200 channels from the “standard” memory channels.  10 “Weather Broadcast” Channels.Memory Storage1.  Select  the  desired  frequency,  while operating in the VFO mode. Be  sure to set up any desired CTCSS or DCS tones, as well as any desired repeater offset, now. The power level may also be set at this time, if you wish to store it.2.  Press and hold in the [F/W] key for one second.3.  Within ten seconds of releasing the [F/W] key, you need to make a decision regard-ing channel storage. The microprocessor will automatically select the next-available “free” channel  (a memory  register on which no data has been stored), so  you may not wish to make any change; if this is the case, proceed to step 4. If you wish to se-lect a different channel number into which to store the data, rotate the DIAL knob or press the [p]/[q] key to select the desired memory channel.4.  Press the [F/W] key once more to store the frequency into memory.5.  You still will be operating in the “VFO” mode, so you may now enter other frequen-cies, and store them into additional memory locations, by repeating the above pro-cess.Storing Independent Transmit Frequencies (“Odd Splits”)All  memories  can  store  an independent transmit frequency,  for  operation  on  repeaters with non-standard shift. To do this:1.  Store  the  receive  frequency  using the method already  described  under  MEMORY STORAGE (it doesn’t matter if a repeater offset is active). 2.  Tune to the desired transmit frequency, then press and hold in the [F/W] key for one second.3.  Within ten seconds of releasing the [F/W] key, rotate the DIAL knob or press the [p]/[q] key to select the same memory channel number as used in step “1” above.4.  Press and hold in the PTT switch. Then while holding the PTT switch in, momen-tarily press the [F/W] key once more. (This does not key the transmitter).Whenever you recall a memory which contains independently-stored transmit and re-ceive frequencies, the “ ” indication will appear in the display.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 23Memory ModeMemory Recall1.  While operating in the VFO mode, press the [V/M] key to enter the Memory mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select the desired channel.3.  To return to the VFO mode, press the [V/M] key.HOME Channel MemoryA  special  one-touch  “HOME” channel is  available,  to  allow quick recall of  a  favorite operating frequency.Home Channel storage is simple to accomplish:1.  Change the setting of Set Mode Item 32: REV/HM from “REV” to “HOME,” if it is not already set to this option (see page 59).2.  Select the  desired frequency, while operating in the VFO mode.  Be sure  to set  up any desired CTCSS or DCS tones, as well as any desired repeater offset. The power level may also be set at this time, if you wish to store it.3.  Press and hold in the [F/W] key for one second.4.  While the memory channel number is blinking, just press the [REV] key. The fre-quency and other data (if any) will now be stored in the special HOME channel register.5.  To  recall  the  HOME  channel, press  the  [REV]  key  mo-mentarily while operating either in the VFO or MR mode.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual24Memory ModeLabeling MemoriesYou may wish to append an alpha-numeric “Tag” (label) to a memory or memories, to aid in recollection of the channel’s use (such as a club name, etc.). This is easily accom-plished using the Set Mode.1.  Recall the memory channel on which you wish to append a label.2.  Press the [SET] key to enter the Set mode.3.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 27: NM WRT.4.  Press the [F/W] key momentarily to display the previously stored label (if any).5.  Press the [F/W] key to clear any previous label.6.  Rotate the DIAL knob to select the rst digit of the desired label.7.  Press the [F/W] key to move to the next character.8.  If  you  make a  mistake,  press  the  [q]  key  to  back-space the cursor, then re-enter the correct letter, number, or sym-bol.9.  Repeat steps 5 through 7 to program the remaining letters, numbers,  or  symbols  of  the  desired label. A  total  of six characters may be used in the creation of a label.10. When you have programmed a label which is under 6 char-acters, press and hold in the [F/W] key for one second  to confirm the label (if  the  label  is  exactly 6 characters  in length, you do not need to press and hold in [F/W] key).11. When you have completed the creation of the label, press the PTT switch to save the label and return to the memory recall mode.To enable the alpha-numeric Tag (and disable the frequency display):1.  Set the FT-252 to the “MR” (Memory Recall) mode, and recall the memory channel on which you wish to enable the alpha-numeric Tag.2.  Press the [SET] key to enter the Set mode.3.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 26: NAME.4.  Press the [F/W] key momentarily to enable adjustment of this Item.5.  Rotate  the DIAL  knob or press the [p]/[q]  key to set this to “ALPHA”  (enabling the alpha-numeric “Tag” display).FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 256.  To display the frequency again, just repeat the above procedure.7.  When you have made your selection, press the PTT switch to save the setting and exit to normal operation.To display the frequency again, just repeat the above procedure, rotating the DIAL knob or press the [p]/[q] key to select “FREQ” in step 5 above.This procedure is not applied to all memory channels at once (just the channel on which you currently are operating).Memory Offset TuningOnce you have recalled a particular memory channel, you may easily tune off that chan-nel, as though you were in the “VFO” mode.1.  With the  FT-252 in the  “MR”  (Memory  Recall)  mode,  select  the desired memory channel.2.  Press and hold the [REV] key for one second to activate the “Memory Tuning” fea-ture. The  Memory  Channel  number  will  be replaced by “tun.” And if  you  have  an  alpha-numeric  Tag  displayed on the  memory channel,  the display  will automatically revert  to  display  of  the  operating  frequency,  so  you  can navigate without having to enter the Menu to change the display conguration.3.  Rotate the DIAL knob, as desired, to tune to a new frequency. The synthesizer steps selected for VFO operation will be the steps used during Memory Tuning.4.  If you wish to return to the original memory frequency, just press the [V/M] key mo-mentarily. The display will revert  to display  of the alpha-numeric Tag (if any) that may have originally appeared on the LCD.5.  If you wish to store a new frequency set during Memory Tuning, just press and hold in the [F/W] key for one second, per normal memory storage procedure. The micro-processor  will  automatically set itself to the next-available clear memory  location, and you then press [F/W] again to lock in the new frequency.1) If you want to replace the original memory contents with those of the new frequen-cy, be sure to rotate the DIAL knob to the original memory channel number!2) Any required CTCSS/DCS changes, or repeater offset modications, must be done before storing the data into the new (or original) memory channel location.Memory ModeFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual26Memory ModeDeleting MemoriesYou  may delete  any of  the memories  (except for  Memory Channel “1” and the Home Channel). The procedure for deleting a channel is quite simple.1.  Press the [V/M] key, if needed, to enter the MR mode.2.  Press and hold in the [F/W] key for one second, then rotate the DIAL knob or press the [p]/[q] key to select the memory channel to be deleted.3.  Press  the [SET] key momentarily. The  display  will  revert  to  memory  channel #1. The previously-selected memory will be deleted.Important Notice! Once deleted, the channel data cannot be recovered!Memory Bank OperationThe large  number of memories  available  in  the FT-252 could be  difficult to utilize without some means of organizing them. Fortunately, the FT-252 includes provision for dividing the memories into as many as ten Memory Groups, so you can categorize the memories in a manner convenient to you.Assigning Memories to a Memory Bank1.  Recall  the memory  channel  to  be  assigned  to  a  Memory Bank.2.  Press  and hold in the [V/M] key for  one second, then ro-tate the DIAL knob or press the [p]/[q] key to select the Memory Bank number you want as the Memory Bank for this channel (“BANK 1” ~ “BANK10”).3.  Press  and hold  in  the  [F/W]  key  for  one  second  to  copy the memory channel data into the Memory Bank.1)  You may assign one memory channel into multiple Memory Banks.2) The PMS memory channels (L1/U1 through L10/U10) may not be assigned to a Memory Bank.Memory Bank Recall1.  Press the [V/M] key, if needed, to enter the Memory Recall mode.2.  Press  and  hold  in  the [V/M]  key, then  rotate the  DIAL knob or press the [p]/[q] key to select the desired Mem-ory Bank (“BANK 1” through “BANK10”).3.  Press  the [V/M] key  momentarily; now, as you  rotate the DIAL knob or press the [p]/[q] key to select memories, you will observe that  you  can  only  select  memory chan-nels  in the current memory bank. The  “ ”  indication will appear at the left side of the frequency display while operating within a Memory Bank.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 274.  To  change to  another Memory Bank, press and  hold in  the [V/M] key, rotate the DIAL knob or press the [p]/[q] key to select the new Memory Bank, then press the [V/M] key momentarily.5.  To exit from Memory Bank operation, select “NOBANK” in  step 4 above. You  are  now  in  the  “standard” Memory Recall  mode, without utilization of  the  Memory  Banks. The memories stored in the various Banks will remain in those banks, however; you do not need to store them again.Removing Memories from a Memory Bank1.  Recall the memory channel to be removed from a Memory Bank.2.  Press and hold in the [V/M] key for one second, then press and hold in the [F/W] key to remove the memory channel data from the Memory Bank.Moving Memory Data to the VFOData stored on memory channels can easily be moved to the last selected VFO, if you like.1.  Select the memory channel containing the frequency data to be moved to the VFO.2.  Press  and  hold the  [V/M]  key  to  activate  the  “Memory Tune” feature  temporarily, then press and hold in the [V/M] key for one second. The data will now have been copied to the last selected VFO, although the original memory contents will remain intact on the previously-stored channel.If a Split Frequency Memory channel was transferred, the TX frequency will be ig-nored (you will be set up for Simplex operation on the Receive frequency).Memory Only ModeOnce memory channel programming has been completed, you may place the radio in a “Memory Only” mode, whereby VFO operation is impossible. This may be particularly useful during public-service events, where a number of operators may be using the radio for rst time, and ultimate simplicity of channel selection is desired.To place the radio into the Memory Only mode:1.  Turn the radio off.2.  Press and hold in the [V/M] key while turning the radio on.3.  Rotate the DIAL knob to select the “F5 M-ONLY” option, then press the [SET] key.To return to normal operation, repeat the above power-on pro-cedure.Memory ModeFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual28Memory ModeWeather Broadcast ChannelsThe VHF Weather Broadcast Station Memory Channel Bank has been pre-programmed at the factory, for quick selection of NOAA weather information stations.1.  Press the [F/W] key, then press the [V/M] key to recall the Weather Broadcast Memory Bank.2.  Rotate the DIAL knob or press the [p]/[q] key to select the desired Weather Broadcast channel.3.  If you  wish  to  scan  this bank to  search  for louder stations, just press the PTT switch. When the scanner pauses on a station, press the PTT switch once to halt the scan, or press it twice to restart the scan.4.  To exit to normal operation, press the [V/M] key.Severe Weather AlertIn the event of extreme weather disturbances, such as severe thunderstorms and hurri-canes, the NOAA (National Oceanic and Atmospheric Administration) sends a weather alert accompanied  by  a 1050 Hz  tone  and subsequent weather  report  on one of  the NOAA weather channels. See page 38  for details regarding activation of this mode.CH0102030405CH0607080910Frequency162.550 MHz162.400 MHz162.475 MHz162.425 MHz162.450 MHzFrequency162.500 MHz162.525 MHz161.650 MHz161.775 MHz163.275 MHzFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 29The  FT-252  allows you to scan  just  the  memory  channels,  the  entire  operating  band, or  a portion of that band. It  will  halt  on  signals  encountered,  so  you  can talk to the station(s) on that frequency, if you like.Scanning operation is basically the same in each of the above modes. Before you begin, take a moment to select the way in which you would like the scanner to resume scan-ning after it halts on a signal.Setting the Scan-Resume TechniqueThree options for the Scan-Resume mode are available:BUSY:  In this mode, the scanner will halt on a signal it encounters. Two seconds after the  carrier  has dropped because the other station(s) ceased  transmission,  the scanner will resume. In the case of constant-carrier signals like Weather Station broadcasts, the scanner will likely remain on this frequency indenitely.HOLD:  In this mode, the scanner will halt on a signal it encounters. It will not restart automatically; you must manually re-initiate scanning if you wish to resume.TIME:  In this mode, the scanner will halt on a signal it encounters, and will hold there for ve seconds. If you do not take action to disable the scanner within that time period, the scanner will resume even if the stations are still active.To set the Scan-Resume mode:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL  knob  or press the [p]/[q]  key  to  select Set Mode Item 31: RESUME.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate  the  DIAL  knob  or  press  the  [p]/[q]  key  to  select  the  desired  scan-resume mode.5.  When you have made your selection, press the PTT switch to save the new setting and exit to normal operation.The default condition for this Set Mode Item is “TIME”.ScanningSetting tHe SqueLcH LeveL during Active ScAnning oPerAtionThe FT-252 allows adjustment of the Squelch level “on the y” while you are scanning.1.  While the scanner is engaged, press the [VOL/SQL] key twice (the current squelch level (e.g. “LVL 1”) will appear in ne print above the frequency display).2.  Rotate  the  DIAL knob or press  the  [p]/[q]  key  to  select  the  desired Squelch level.3.  Press  the  PTT  switch  momentarily to save the  new  setting  and  exit to normal operation. In this case, pressing the PTT switch this one time will not causing scanning to stop.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual30ScanningVFO ScanningThe FT-252 provides two VFO scanning functions: “Manual VFO Scanning” and “Pro-grammed VFO Scanning.”Manual VFO Scan1.  Select the VFO mode by pressing the [V/M] key, if necessary.2.  Press  and  hold  in  either  the  [p] or [q]  key  for  one  second  to  initiate  upward  or downward scanning, respectively. 3.  If and when the scanner encounters a signal strong enough to open the squelch, the scanner will halt temporarily; the decimal point of the frequency display will blink during this “Pause” condition.4.  The  scanner  will  then  resume  according to the Scan-Resume  mode  selected  in  the previous section.5.  To cancel scanning, press the PTT switch or [V/M] key.Programmed VFO Scan1.  Select the VFO mode by pressing the [V/M] key, if necessary.2.  Press and hold the [REV] key, then rotate the DIAL knob or press the [p]/[q] key to select the bandwidth for the Programmed VFO scanner. Available selections are ±1 MHz, ±2 MHz, ±5 MHz, PMS-x, and ALL.±1 MHz, ±2 MHz, ±5 MHz:  The scanner will  sweep  frequencies  within the selected bandwidth.PMS-x: The  scanner will sweep  frequencies  within  the currently-selected PMS frequency pair. See page 34 for details.ALL:  The scanner will sweep all frequencies.3. Press the PTT switch momentarily to save the new setting and exit to normal operation.4.  Press  and  hold  in  the  [V/M]  key  for  one  second  to  start scanning.5.  If and when the scanner encounters a signal strong enough to open the squelch, the scanner will halt temporarily; the decimal point of the frequency display will blink during this “Pause” condition.6.  The  scanner  will  then  resume  according to the Scan-Resume  mode  selected  in  the previous section.7.  To cancel scanning, press the PTT switch.When you start  the  Programmed  VFO  Scanner,  the  FT-252  will  be  changing fre-quency in the upward direction. If you want to change direction of the scan while it is underway, rotate the DIAL knob one click in the opposite direction (in this case, one click counter-clockwise). You’ll see the scanner turn around and change frequency downward!FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 31Memory ScanningMemory scanning is similarly easy to initiate:1.  Select the Memory mode by pressing the [V/M] key, if necessary.2.  Press  and  hold  in  either  the  [p] or [q] key for one second  to  initiate  upward  or downward scanning, respectively.3.  If and when the scanner encounters a signal strong enough to open the squelch, the scanner will halt temporarily; the decimal point of the frequency display will blink during this “Pause” condition.4.  The  scanner  will  then  resume  according to the Scan-Resume  mode  selected  in  the previous section.5.  To cancel scanning, press the PTT switch.How to Skip (Omit) a Channel during Memory Scan OperationAs mentioned previously, some continuous-carrier stations like a Weather Broadcast sta-tion will seriously impede scanner operation if you are using the “Carrier Drop” Scan-Resume mode, as the incoming signal will not pause long enough for the transceiver to resume scanning. Such channels may be “Skipped” during scanning, if you like:1.  Recall the Memory Channel to be skipped during scanning.2.  Press the [SET] key to enter the Set mode.3.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 40: SKIP.4.  Press the [F/W] key momentarily enter the “Skip” channel-selection mode.5.  Rotate  the DIAL  knob or  press the  [p]/[q] key so as to select “SKIP”. The current Memory Channel will now be ignored  during  scanning. The  “ONLY”  selection  is  used for “Preferential  Memory  Scan,” described  in the  next section.6.  When you have made your selection, press the PTT switch to save the setting and exit to normal operation.When you recall the “skipped” memory channel manually, a small “” icon will appear at the left of the memory channel number, indicating it is to be ignored during scanning.To re-institute a channel into the scanning loop, select “OFF” in  step  5  above  (the  “Skipped”  channel  will,  of  course,  still  be  accessible  via  manual channel selection methods using the DIAL knob in the MR mode, whether or not it is locked out of the scanning loop).ScanningFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual32ScanningPreferential Memory ScanThe FT-252 also allows you to set up a “Preferential Scan List” of channels which you can “ag” within the memory system. These channels are designated by a blinking “” icon when you have selected them, one by one, for the Preferential Scan List.When you initiate memory scanning, beginning on a channel with the blinking “” icon appended, only those channels bearing the blinking  “”  icon will be scanned.  If  you initiate scanning on a channel which does not have the blinking “” icon appended, you will scan all channels including those with the blinking “” icon appended.Here is the procedure for setting up and using the Preferential Scan List:1.  Recall the Memory Channel which you wish to add to the Preferential Scan List.2.  Press the [SET] key to enter the Set mode.3.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 40: SKIP.4.  Press the [F/W] key momentarily enter the “Skip” channel-selection mode.5.  Rotate  the DIAL  knob or  press the  [p]/[q] key so as to select “ONLY”.6.  When  you have  made  your  selection,  press  the  PTT switch to save the setting and exit to normal operation.7.  To remove a channel from the Preferential Scan List, just repeat the above proce-dure, rotating the DIAL knob to select “OFF” in step 5 above.To initiate Preferential Memory Scan:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key to select Set Mode Item 38: SCN MD.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate  the  DIAL  knob or press  the  [p]/[q] key so  as  to select “ONLY”.5.  Press  the PTT switch to save  the setting and exit to  nor-mal operation.6.  Now, press and hold in either the [p] or [q] key for one second to initiate the Pref-erential Memory Scan. Only the channels which have the blinking “” icon append-ed to the channel number will be scanned.7.  To cancel the  Preferential  Memory  Scan,  just  repeat  the  above  procedure,  rotating the DIAL knob or press the [p]/[q] key to select “MEM” in step 4 above.Memory ScanningFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 33Memory Bank ScanWhen the Memory Bank feature is engaged, the scanner sweeps only memory channels in the current  Memory Bank. However, if  the Memory Bank  Link Scan feature  is en-abled, you may sweep the memory channels in several Memory Banks which you have selected.To enable the Memory Bank Link Scan feature:1.  Set the radio to the Memory mode by pressing the [V/M] key, if necessary.2.  Press and hold in the [V/M] key  for one second, then rotate the DIAL knob or press the [p]/[q] key to  select  the rst  Memory  Bank (“BANK 1” ~  “BANK10”) you wish to sweep using Memory Bank Link Scan.3.  Press  the  [F/W]  key  momentarily. The  current  Memory Bank will now  be  swept  during Memory Bank  Scan. A “decimal point” will be appended between the “N” and “K” of the  Memory Bank  number indication (such as BAN.K 2).4.  Repeat  steps  2  and  3 above, to append  the  “decimal  point”  to  any  other  Memory Banks you wish to sweep.5.  Now, press  and hold in the [p] or [q] key  for one second to initiate  the Memory Bank Link Scan.6.  To remove a Memory Bank from the Memory Bank Link Scan, repeat steps 2 and 3 above, to delete the “decimal point” from the Memory Bank number indication.ScanningMemory ScanningFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual34ScanningProgrammable (Band Limit) Memory Scan (PMS)This feature allows you to set sub-band limits for either scanning or manual VFO opera-tion. For example, you might wish to set up a limit (in North America) of 144.300 MHz to 148.000 MHz so as to prevent encroachment into the SSB/CW “Weak Signal” portion of the band below 144.300 MHz. Here’s how to do this:1.  Set the radio to the VFO mode by pressing the [V/M] key, if necessary.2.  Using the techniques learned earlier, store (per the above concept) 144.300 MHz into Memory Channel #L1 (the “L” designates the Lower sub-band limit).3.  Likewise,  store  148.000  MHz  into  Memory  Channel  #U1 (the “U”  designates  the Upper sub-band limit).4.  Conrm the radio is in the VFO mode, press and hold in the [REV] key for one sec-ond, and rotate the DIAL knob to select the desired PMS frequency pair (PMSxx), then press the PTT switch.5.  Now, press and hold in the [V/M] key for one second to initiate Programmable (Band Limit) Memory Scan. Scanning  will  now  be  limited  within the just-programmed range.6.  10  pairs  of  Band  Limit  memories,  labeled  L1/U1 through L10/U10 are available. You therefore can set upper and lower operation limits in multiple segments on the band, if you like.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 35“Priority Channel” Scanning (Dual Watch)The FT-252’s scanning features include a two-channel scanning capability which allows you to operate on a VFO or Memory channel, while periodically checking a user-dened Memory Channel for activity. If a station is received on the Memory Channel which is strong enough to open the Squelch, the scanner will pause on that station in accordance with the Scan-Resume mode set via Set Mode Item 31: RESUME. See page 29.Here is the procedure for activating Priority Channel Dual Watch operation:VFO Priority1.  Recall the memory channel you wish to use as the “Priority” frequency.2.  Now, set the radio to the VFO mode by pressing the [V/M] key.3.  Press  the  [F/W]  key,  then press  the  [VOL/SQL]  key  to  activate  the  VFO  Priority mode. The  display  will  remain  on  the VFO  frequency,  but  every  ve  seconds  the radio will check the Priority Channel (memory channel) for activity.4.  Press [F/W]  [VOL/SQL] again to disable the VFO Priority mode.Memory Channel Priority1.  Store the frequency you wish to be the “Priority” Channel into memory channel “1”.2.  Now, set the radio for operation on another memory channel.3.  Press the [F/W] key, then press the [VOL/SQL] key to activate the Memory Priority mode. The display will remain on the current memory channel frequency, but every ve seconds the radio will check the Priority Channel (memory channel “1”) for ac-tivity.4.  Press [F/W]  [VOL/SQL] again to disable the Memory Priority mode.When the Memory Bank feature is activated, the FT-252 will check the lowest num-bered memory channel in the current Memory Bank as the Priority Channel.HOME Channel Priority1.  Recall the memory channel you wish to use as the “Priority” frequency.2.  Now set the radio for operation on the HOME channel by pressing the [F/W] key followed by [REV].3.  Press the [F/W] key, then press the [VOL/SQL] key to activate the HOME Priority mode. The display will remain on the HOME channel frequency, but every ve sec-onds the radio will check the Priority Channel (memory channel) for activity.4.  Press [F/W]  [VOL/SQL] again to disable the HOME Priority mode.ScanningFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual36WX Channel Priority1.  Recall the memory channel you wish to use as the “Priority” frequency.2.  Now, set the radio for operation on a WX channel by press the [F/W] key, then press the [V/M] key.3.  Press the [F/W]  key,  then  press  the  [VOL/SQL]  key  to  activate  the  WX  Priority mode. The display will remain on the WX channel frequency, but every ve seconds the radio will check the Priority Channel (memory channel) for activity.4.  Press [F/W]  [VOL/SQL] again to disable the VFO Priority mode.Scanning“Priority Channel” Scanning (Dual Watch)Priority Revert ModeDuring Priority channel operation (Dual Watch), a special feature is available which will allow you to move to the Priority channel instantly, without waiting for activity to appear on the Priority channel.When this feature is enabled, and Priority monitoring is engaged, just press the PTT switch; operation will instantly revert to the Priority channel.To enable the Priority Revert operation:1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to se-lect Set Mode Item 35: PRI.RVT.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to set this Set Mode Item to “RVT. ON.”5.  When  you have  made your  selection, press  the PTT  switch to  save the  setting and exit to normal operation.6.  To disable the Priority Revert operation, just repeat the above procedure, rotat-ing the DIAL knob to select “RVT.OFF” in step 4 above.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 37Automatic Lamp Illumination on Scan StopThe FT-252 will  automatically illuminate the LCD/Keypad Lamp whenever the  scan-ner stops on a signal; this allows you to see the frequency of the incoming signal better at night. Note that this will, of course, increase the battery consumption, so be sure to switch it off during the day (the default condition for this feature is “ON”).The procedure for disabling the Scan Lamp is:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key to  select Set Mode Item 39: SCN.LMP.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to set this Set Mode Item to “OFF.”5.  When you have made your selection, press the PTT switch to save the setting and exit to normal operation.Band Edge BeeperThe  FT-252 will automatically “beep” when a band edge is encountered during scan-ning (either in standard VFO scanning or during PMS operation). You may also enable this  feature  (band  edge  beeper) to  operate  when  the  frequency  reaches  the  band  edge while tuning using the DIAL knob.The procedure for enabling the Band-Edge Beeper is:1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 20: EDG.BEP.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to set this Set Mode Item to “BEP. ON.”5.  When you have made your selection, press the PTT switch to save the setting and exit to normal operation.ScanningFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual38Weather Alert ScanThis feature allows you to check the Weather Broadcast Memory Channels for the pres-ence of the NOAA Alert Tone while operating using VFO scan or Memory channel scan.When the Weather Alert Scan feature is engaged, the FT-252  will  check  the Weather Broadcast Memory Channels  for  activity  every five seconds  while  scanning. If you watch the  display carefully,  you’ll  observe  the scanner  periodically shifting  to the Weather Broadcast bank, scanning the Weather channels quickly in search of the Alert Tone, after which regular scanning will resume for another ve seconds.To enable the Weather Alert Scan feature:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key  to  select Set Mode Item 48: WX ALT.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to select “ON”.5.  When you have made your selection, press the PTT switch to save the setting and exit to normal operation.6.  To disable the Weather Alert Scan feature, select “OFF” in step 4 above.1)  When the Weather Alert Scan feature is engaged, the Scan-Resume mode is xed to “TIME”.2)  If you are just scanning the Weather Broadcast Channels, the FT-252’s receiver will remain muted indenitely unless the Alert Tone is received. This yields a long period of monitoring time, as no power will be consumed via audio output while scanning for the Alert Tone is in progress.ScanningFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 39The FT-252 includes an “Emergency” feature which may be useful if you have some-one monitoring on the same frequency as your transceiver’s “Home” channel. See page 23 for details on setting up the Home channel.The “Emergency” feature is activated by pressing and holding in the [SET] key for one second. When  this is done,  (A)  the radio is  placed on the  Home  channel, (B) it  emits a loud “Alarm” sound (the volume is controlled  by the DIAL knob), (C) it ashes the LCD  lamp,  (D)  if  you  press the  PTT  switch,  you  will  disable the  Emergency feature temporarily; you can then transmit on the Home channel, and (E) two seconds after the PTT switch release, the Emergency feature will resume.To disable the “Emergency” feature, press the [SET] key momentarily or turn the radio off by pressing the [POWER] switch.Use  this  feature  if  you  are out for  a  walk  and  want  a  quick  way of  alerting  a  family member as to a dangerous situation. The alarm sound may  discourage an attacker and allow you to escape.1)  Be sure to arrange with a friend or family member to be monitoring on the same frequency, as there will be no identication sent via the Emergency alarm sound. And do not transmit the alarm tone except in a true emergency!2)  The “Emergency” feature may be changed to another function via Set Mode Item 21: EMG S; see page 57 for details.Emergency Channel OperationFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual40The  Smart  Search  feature  allows you to load frequencies automatically according to where activity is encountered by your radio. When Smart Search is engaged, the trans-ceiver will search above and below your current frequency, storing active frequencies as it goes (without stopping on them even momentarily); these frequencies are stored into a special Smart Search memory bank, consisting of 31 memories (15 above the current frequency, 15 below the current frequency, plus the current frequency itself).Two basic operating modes for Smart Search are available:SINGLE: In this mode, the transceiver will sweep the current band once in each direc-tion starting on  the  current  frequency. All channels  where activity is present will be loaded into the Smart Search memories; whether or not all 31 memo-ries are lled, the search will stop after one sweep in each direction.CONT:  In this mode, the transceiver will make one pass in each direction as with One-Shot searching; if all 31 channels are not lled after the rst sweep, however, the radio will continue sweeping until they are all lled.Setting the Smart Search Mode1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key to select Set Mode Item 37: S SRCH.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate  the DIAL knob  or press the [p]/[q] key to  select the desired Smart Search mode (see above).5.  When  you have  made  your  selection,  press  the  PTT switch to save the setting and exit to normal operation.Storing Smart Search Memories1.  Set the radio to the VFO mode. Be sure that you have the Squelch adjusted properly (so that band noise is quieted).2.  Press the [F/W] key, then press the [H/L] key to begin the Smart Search scanning.3.  As active channels are detected, you will observe the number of “loaded” channels increasing in the regular memory channel window.4.  Depending  on the mode you set for Smart  Search opera-tion (“SINGLE” or “CONT”), the Smart Search scan will eventually terminate, and  the  LCD  will revert to  Smart Search Memory Channel “C.”5.  To recall the Smart Search memories, rotate the DIAL knob to choose from among the frequencies stored by Smart Search.6.  To return to normal operation, press the [VFO(PRI)] key.Smart Search OperationFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 41The ARTS™ feature uses DCS signaling to inform both parties when you and another ARTS™-equipped  station  are  within  communications  range. This may  be  particularly useful during Search-and Rescue situations, where is important to stay in contact with other members of your group.Both stations must set up their DCS codes to the same code number, then activate their ARTS™ feature using the command appropriate for their radio. Alert ringers may be ac-tivated, if desired.Whenever you push the PTT  switch,  or every 25  (or  15) seconds after ARTS™ is activated, your radio will transmit a signal which includes a (subaudible) DCS signal for about 1 second. If the other radio is in range, the beeper will sound (if enabled) and the display will show “IN.RNG” as opposed to the out of  range  display “OUT.RNG” in which ARTS™  op-eration begins.Whether you talk or not, the polling every 15 or 25 seconds will continue until you de-activate ARTS™. Every 10 minutes, moreover, you can have your radio transmit  your callsign via  CW, so  as to comply  with identication require-ments. When ARTS™ is de-activated, DCS will also be deactivated (if you were not us-ing it previously in non-ARTS™ operation).If you move out of range for more than one minute (four pollings), your radio will sense that no signal has been received, three beeps will sound, and the display will revert to “OUT.RNG.” If you move back into range, your radio will again beep, and the display will change back to the “IN.RNG” indication.During ARTS™  operation, your  operating frequency will  continue to  be displayed, but no changes may be made to it or other settings; you must terminate ARTS™ in order to resume normal operation. This is a safety feature designed to prevent accidental loss of contact due to channel change, etc.Basic ARTS™ Setup and Operation1.  Set your radio and the other radio(s) to the same DCS code number, per the discus-sion on page 18.2.  Press  the  [POWER] key  momentarily. You will  observe the “OUT. RNG”  display on the LCD below the operating frequency. ARTS™ operation has now commenced.3.  Every 25 seconds, your radio will transmit a “polling” call to the other station. When that station responds with its own ARTS™ polling signal, the display will change to “IN.RNG” to conrm that the other station’s polling code was received in response to yours.4.  Press the [POWER] key momentarily to exit ARTS™ operation and resume normal functioning of the transceiver.ArtS™ (Automatic Range Transponder System)FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual42ARTS™ constitutes a form of “remote control” operation that may be restricted to certain frequencies. U.S. users should conrm the current status of §97.201(b) of the FCC’s rules governing the 144 MHz band of the Amateur service before utilizing this feature.ARTS™ Polling Time OptionsThe ARTS™ feature may be programmed to poll every 25 seconds (default value) or 15 seconds. The default value provides maximum battery conservation, because the polling signal is sent out less frequently. To change the polling interval:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key  to  select Set Mode Item 5: AR INT.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to select the desired polling interval (15 or 25 seconds).5.  When you have made your selection, press the PTT switch to save the new setting and exit to normal operation.ARTS™ Alert Beep OptionsThe ARTS™ feature allows two kinds of alert beeps (with the additional option of turn-ing them off), so as to alert you to the current status of ARTS™ operation. Depending on your location and the potential annoyance associated with frequent beeps, you may choose the Beep mode which best suits your needs. The choices are:INRANG:  The beeps are issued only when the radio rst conrms that you are within range, but does not re-conrm with beeps thereafter.ALWAYS:  Every time a polling transmission is received from the other station, the alert beeps will be heard.OFF:  No alert beeps will be heard; you must look at the display to conrm cur-rent ARTS™ status.To set the ARTS™ Beep mode, use the following procedure:1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 4: AR BEP.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to select the desired ARTS™ Beep mode (see above).5.  When you have made your selection, press the PTT switch to save the new setting and exit to normal operation.ArtS™ (Automatic Range Transponder System)FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 43CW Identier SetupThe ARTS™ feature includes a CW identier, as discussed previously. Every ten min-utes during ARTS™ operation, the radio can be instructed to send “DE (your callsign) K” if this feature is enabled. The callsign eld may contain up to 6 characters.Here’s how to program the CW Identier:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key  to  select Set Mode Item 12: CW WRT.3.  Press the [F/W] key momentarily to display any previous-ly-stored callsign.4.  Press the [F/W] key again to clear any previous callsign.5.  Rotate  the  DIAL knob to  select the rst  letter/number  of your callsign, then press the [F/W] key momentarily  to save the rst letter/number and move on to the next char-acter.6.  Repeat  the  previous step, as  many  times as necessary, to complete your  callsign. If you make a  mistake, press  the [q] key to move back to the previous letter/number’s slot, then re-select the correct letter/number.7.  When you have nished entering your entire callsign and it contains less  than  6  characters, press and  hold  in  the [F/W] key for one second to conrm the callsign. (if you callsign has exactly 6 characters, you do not need to press and hold in [F/W] in this step).8.  Press the PTT switch to save the settings and exit to normal operation.9.  Press the [SET] key to enter the Set mode.10. Rotate the DIAL  knob  or  press the [p]/[q]  key  to  select Set Mode Item 13: CWID.11. Press  the  [F/W]  key  momentarily,  then  rotate  the  DIAL knob to set this  Item  to “TX ON” (to enable  the  CW ID function).12. Press the PTT switch to save the settings and exit to normal operation.ArtS™ (Automatic Range Transponder System)FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual44DTMF OperationDespite the  lack of  a DTMF keypad, you can  still transmit  DTMF tones  with the FT-252 for repeater control or autopatch use.DTMF AutodialerNine  DTMF Autodial memories  are  provided,  allowing  you  to  store  telephone  num-bers for autopatch use. You can also store short autopatch or Internet-link access code streams so as to avoid having to send them manually.Here is the DTMF Autodial storage procedure:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key to select Set Mode Item 19: DT WRT.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate  the DIAL knob to select  the DTMF  Memory reg-ister  (“d1”  ~  “d9”) into  which  you wish  to  store this DTMF string.5.  Press the [F/W] key momentarily to begin DTMF Memory entry into the selected register.6.  Rotate the DIAL knob to select the rst digit of the DTMF string. Selectable entries are 0 - 9, and A - F, with E and F representing DTMF “” and “#” tones respectively.7.  Press  the [F/W] key  to accept the rst digit  and move to the next digit of the DTMF string.8.  Repeat  steps  5 and  6  until  you  have  completed  the  tele-phone number.9.  If you make a mistake, press the [q] key to move back to the previous digit, then re-select the correct number.10. If  the  telephone  number  made  up  of  numbers only,  you  may  key  in  the telephone number directly from the keypad.11. Press and hold in the [F/L] key for one second to save the setting.12. If you store other numbers, repeat steps 4- 10 above, using a different DTMF memo-ry register.13. When  all required DTMF memories  are  lled  to  your  satisfaction,  press  the  PTT switch to save the settings and exit to normal operationFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 45To send the telephone number:1.  Press and hold the PTT switch to continue transmitting during following steps.A.  Press the [p] or [q] key to select the DTMF Memory register ([d 1] through [d 9]) you wish to send.B.  Press the [F/L] key momentarily to transmit the tone string.   Once the string begins, you may release the PTT switch, asthe transmitter will be held “on the air” until the DTMF string is completed.You  can  change  the DTMF Autodialer  sending  speed,  using Set Mode  Item  18:  DT  SPD. See page 57 for details.You  can also set a longer  delay between  the time you press the  numerical key  (corre-sponding to the DTMF memory string; with PTT switch pressed) and the instant when the rst DTMF digit is sent, using Set Mode Item 17: DT  DLY. See page 57 for details.When  you  activate  the ANI  (Automatic  Number  Identication)  feature  during  DTMF operation, the DTMF tones stored in ANI memory will automatically be sent whenever you press the PTT switch.DTMF OperationFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual46DTMF OperationStoring the ANI code1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key to select Set Mode Item 2: ANI.WRT.3.  Press the [F/W] key momentarily to display any previous-ly-stored ANI code.4.  Press the [F/W] key again to clear any previous ANI code.5.  Rotate the DIAL knob to select the rst number/letter (0-9, A, B, C, D, E (substitute for “”), and F (substitute for “#”), then press the [F/W] key momentarily to save the rst letter/number and move on to the next character.6.  Repeat the previous step, as many times as necessary (up to 16 characters), to com-plete ANI code. If you make a mistake, press the [q] key to move back to the previ-ous letter/number’s slot, then re-select the correct letter/number.7.  When you have nished entering the ANI code and it contains less than 16 charac-ters, press and hold in the [F/W] key for one second to conrm the callsign. (if the ANI code has exactly 16 characters, you do not need to press and hold in [F/W] in this step).8.  Press the PTT switch to save the settings and exit to normal operation.Activating the ANI feature1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key to select Set Mode Item 1: ANI.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to select “ON.”5.  Press the PTT switch to save the new setting and activate the ANI feature.6.  Press the PTT switch to send the DTMF tones stored in ANI memory.7.  To disable the ANI feature, just repeat the above procedure, rotating the DIAL knob  or press the [p]/[q] key to select “OFF” in step 4 above.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 47PasswordThe FT-252 provides a security password feature which can minimize the chance that your transceiver could be used by an unauthorized party.When the password feature is activated, the radio will ask for the  four digit password to be entered  when  the  radio  is  rst turned  on. You must enter  the  four  digit  password  from  the keypad. If the wrong password is entered, the microprocessor will shut down the radio automatically.To enter the password , use the following procedure:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key to  select Set Mode Item 29: PSWD W.3.  Press  the  [F/W]  key,  then  press the [F/W]  key again  to clear any previous password.4.  Rotate the DIAL knob to select the rst digit of the desired number/letter (0-9, A, B, C, D, E, and F).5.  Press the [F/W] key to move to the next digit.6.  Repeat steps 4 and 5 to program the remaining numbers/letters of the desired password.7.  If you make a mistake, press the [q] key to move back to the previous digit, then re-select the correct number/letter.8.  When you have nished entering the password, press the PTT switch to save the new setting and exit to normal operation.We recommend that you to write down the password number, and keep it in a safe place you can easily nd if you forget your password.To Activate the Password feature:1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL knob or press the [p]/[q] key to select Set Mode Item 28: PASSWD.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4. Rotate the DIAL knob or press the [p]/[q] key to set this Set Mode Item to “PWD. ON.”5.  When you have made your selection, press the PTT switch to save the new setting and exit to normal operation.6.  If you wish to disable the Password feature, just repeat the above procedure, rotat-ing the DIAL knob to select “PWD.OFF” in step 4 above.If you forget the password number, you may turn on the transceiver by performing the “All Reset” procedure (see page 52). However, the FT-252 will clear the password, as well as all memories, and will restore all other settings to factory defaults.Miscellaneous SettingsFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual48Changing the Channel StepsThe  FT-252’s  synthesizer  provides  the  option  of  utilizing  channel  steps  of 5/10/12.5/15/20/25/50/100 kHz per step, as well as an automatic step selection based on the current operating frequency (“AUTO”), any number of which may be important to your operating requirements. The FT-252 is set up at the factory in the “AUTO” con-guration, which  probably is satisfactory  for most operation.  However, if  you need to change the channel step increments, the procedure to do so is very easy.1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key  to  select Set Mode Item 22: F STEP.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the DIAL knob or press the [p]/[q] key to select the new channel step size.5.  When you have made your selection, press the PTT switch to save the new setting and return to normal operation.Receive Battery Saver SetupAn important feature of the FT-252  is  its  Receive  Battery  Saver, which “puts the ra-dio  to  sleep”  for  a  time  interval,  periodically  “waking  it  up”  to  check  for activity.  If somebody is talking on the channel, the FT-252 will remain in the “active” mode, then resume  its “sleep” cycles. This  feature  significantly reduces quiescent battery drain, and you may change the amount of “sleep” time between activity checks using the Set Mode:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key  to  select Set Mode Item 36: RXSAVE.3.  Press the [F/W] key momentarily to enable adjustment of this Item.4.  Rotate the DIAL knob or press the [p]/[q] key to select the desired “sleep” duration. The selections available are 200 ms, 300 ms, 500 ms, 1 second, 2 seconds, or OFF. The default value is 200 ms.5.  When you have made your selection, press the PTT switch to save the new setting and exit to normal operation.Miscellaneous SettingsFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 49Miscellaneous SettingsTX Battery SaverThe  FT-252  also  includes  a useful Transmit Battery Saver,  which will automatically lower  the  power  output  level  when  the  last  signal  received  was  very  strong.  For  ex-ample, when you are in the immediate vicinity of a repeater station, there generally is no reason to use the High Power output in  order to achieve full-quieting access to the repeater. With the Transmit Battery Saver, the automatic selection of Low Power opera-tion conserves battery drain signicantly.To activate the Transmit Battery Saver:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key  to  select Set Mode Item 46: TXSAVE.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to set this Set Mode Item to “SAV. ON” (thus activating the Transmit Battery Saver).5.  When you have made your selection, press the PTT switch to save the new setting and exit to normal operation.Transmitter Time-Out Timer (TOT)The TOT feature  provides  a safety  switch which  limits  transmission time  to  a pre-programmed value. This will promote battery conservation by not allowing you to make excessively-long transmissions, and in the event of a stuck PTT switch (perhaps if the radio is wedged between car seats) it can prevent interference to other users as well as battery depletion. As congured at the factory the TOT feature is set to “6 minutes,” and here is the procedure for activating it:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key  to  select Set Mode Item 45: TOT.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to set the Time-Out Timer to the de-sired “Maximum TX” time (between 1 and 30 minutes), or OFF.5.  When you have made your selection, press the PTT switch to save the new setting and exit to normal operation.1)  When your transmission time is within 10 seconds of the Time-Out Timer expira-tion, an Alert bell will provide an audible warning from the speaker.2)  Since brief transmissions are the mark of a good operator, try setting up your ra-dio’s TOT feature for a maximum transmission time of one minute. This will sig-nicantly improve battery life, too!FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual50Busy Channel Lock-Out (BCLO)The BCLO  feature prevents  the radio’s transmitter  from being  activated if  a  signal strong enough to break  through  the  “noise” squelch is present.  On  a  frequency where stations using different CTCSS or DCS codes may be active, BCLO prevents you from disrupting their communications accidentally (because your radio may be muted by its own Tone Decoder). The default setting for the BCLO is OFF, and here is how to change that setting:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key to select Set Mode Item 8: BCLO.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to set this Set Mode Item to “BCL. ON” (thus activating the BCLO feature).5.  When you have made your selection, press the PTT switch to save the new setting and exit to normal operation.DCS Code InversionThe  DCS  system was rst introduced in  the  commercial  LMR  (Land  Mobile  Radio) service, where it is now in widespread use. DCS is sometime referred to by its different proprietary names, such as DPL® (Digital Private Line®, a registered trademark of Mo-torola, Inc.).DCS  uses a codeword consisting of a  23-bit  frame,  transmitted  (subaudible)  at  a  data rate of 134.4 bps (bit/sec). Occasionally, signal inversion can result in the complement of a code to be sent or received. This prevents the receiver’s squelch from opening with DCS enabled, as the decoded bit sequence would not match that selected for operation. Typical situations that might cause inversion to occur are:  Connection of an external receiver preamplier.  Operating through a repeater.  Connection of an external linear amplier.Note that code inversion does not mean that any of the above listed equipment is defec-tive!In certain amplier congurations, the output signal (phase) is inverted from the input. Small signal or power ampliers having an odd number (1, 3, 5, etc.) of amplication stages may result in inversion of a transmitted or received DCS code.While under  most circumstances  this should  not occur  (amplier designs  and industry Miscellaneous SettingsFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 51standards take this  into account), if  you nd that  your receiver squelch  does not open when both  you and  the other station are using a common DCS code, you or the other station (but not both) can try the following:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key to  select Set Mode Item 16: DCS.N/R.3.  Press  the [F/W]  key  momentarily,  then  rotate the DIAL knob or press the [p]/[q] key to select one of the follow-ing modes: T/RX N:  Encoder, Normal; Decoder, Normal  RX R:  Encoder, Normal; Decoder, Reverse (Inverted)  TX R:   Encoder, Reverse (Inverted); Decoder, Normal T/RX R:  Encoder, Reverse (Inverted); Decoder, Reverse (Inverted)4.  When you have made your selection, press the PTT switch to save the new setting and exit to normal operation.5.  Remember  to  restore the default  setting to “T/RX N”  (Encoder; Normal, Decoder; Normal) when done.Changing the TX Deviation LevelIn many areas of the world, channel congestion has required that operating channels be closely spaced. In such operating environments, it often is required that operators use re-duced deviation levels, so as to reduce the potential for interference to users on adjacent channels. The FT-252 includes a simple method of accomplishing this:1.  Press the [SET] key to enter the Set mode.2.  Rotate  the  DIAL knob or press  the  [p]/[q] key to  select Set Mode Item 47: WID.NAR.3.  Press the [F/W] key momentarily to enable adjustment of this Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to set this Set Mode Item to “NAR-ROW.” In this  conguration (HALF DEVIATION  active),  the transmitter’s devia-tion  will  be  approximately  ±2.5  kHz,  and  the  received  audio  output  level  will  be increased, for easier listening on the narrow signal.5.  When you have made your selection, press the PTT switch to save the new setting and exit to normal operation.The “normal” setting for the deviation (when this Menu Item is set to WIDE) is ±5 kHz.Miscellaneous SettingsFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual52In the event of erratic operation of the transceiver, it is possible that data on the micro-processor may have become corrupted. While this is a highly unusual situation, the only path to recovery may involve resetting of the microprocessor. Here’s how to do this:1.  Turn the radio off.2.  Press and hold in the [V/M] key while turning the radio on.3.  Rotate the DIAL knob to select one of the choices from the reset menu:  F1 SETRST:   Resets the Set (Menu) mode settings to their factory defaults.  F2 MEMRST:  Clears the Memory settings to factory defaults.  F3 MB RST:    Clears the Memory Bank Assignments.  F4 ALLRST:   Clears all memories and other settings to factory defaults.4.  Press the [V/M] key momentarily to complete the reset procedure.The “F5” option is used for setting up the “Memory Only” mode. See page 27 for de-tails regarding the memory Only mode.Reset ProceduresFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 53The FT-252 Set Mode, already described in parts of many previous chapters, is easy to activate and set. It may be used for conguration of a wide variety of transceiver param-eters, some of which have not been detailed previously. Use the following procedure to activate the Set Mode:1.  Press the [SET] key to enter the Set mode.2.  Rotate the DIAL  knob  or  press  the [p]/[q]  key to select the Set Mode Item to be adjusted.3.  Press the [F/W] key momentarily to enable adjustment of the Set Mode Item.4.  Rotate the DIAL knob or press the [p]/[q] key to adjust or select the parameter to be changed on the Set Mode Item selected in above step.5.  After completing your selection and adjustment, press the PTT switch momentarily to save the new setting and exit to normal operation.Some Set Mode Items (like Set Mode Item 44: TN FRQ) require that the [F/W] key be pressed after setting of the parameter, and before exiting to normal operation.Set (Menu) ModeSet Mode iteM 1 [ANI]2 [ANI.WRT]3 [APO]4 [AR BEP]5 [AR INT]6 [ARS]8 [BCLO]9 [BEEP]10 [BELL] 11 [CLK.SFT]12 [CW WRT]13 [CWID]14 [DC VLT]15 [DCS.COD]16 [DCS.N/R] 17 [DT DLY] 18 [DT SPD]19 [DT WRT]20 [EDG.BEP]  21 [EMG S]  22 [F STEP] 23 [LAMP]24 [LOCK]  Function Enables/Disables the ANI function.Setting of the Automatic Program the ANI Identier.Power-Off feature.Selects the Beep option during ARTS operation.Selects the Polling Interval during ARTS operation.Enables/Disables the Automatic Repeater Shift function.Enables/Disables the Busy Channel Lock-Out feature.Enables/Disables the beeper.Selects the number of CTCSS/DCS Bell ringer repetitions.  Shifting of the CPU clock frequency.Programs and activates the CW Identier.Enables/disables the CW identier during ARTS operation.Indicates the DC Supply Voltage.Setting of the DCS code.Enables/Disables “Inverted” DCS code decoding. Setting of the DTMF Autodialer Delay Time. Setting of the DTMF Autodialer Sending Speed.Programming of the DTMF Autodialer.Enables/Disables the Band-edge beeper while selecting the frequency via the DIAL knob.Selects the alarm(s) utilized when the Emergency function is engaged. Setting of the synthesizer steps. Selects the LCD/Keypad Lamp mode.Selects the Control Locking lockout combination.  AvAiLAbLe vALueS (deFAuLt: Bold ItalIc)ANI.OFF/ANI. ON---OFF / 0.5H - 12.0 HINRANG / ALWAYS / OFF25 SEC / 15 SECARS. ON / ARS.OFFBCL. ON / BCL.OFFKEY+SC / KEY / OFFOFF / 1T / 3T / 5T / 8T / CONTSFT.OFF / SFT. ON---TX OFF / TX ON---104 DCS codes (023)T/RX N, RX R, TX R, T/RX R50MS / 100MS / 250MS / 450MS / 750MS / 1000MS50MS / 100MS---BEP.OFF / BEP. ON EMG.BEP / EMG.LMP / EMG.B+L / EMG.CWT / EMG.C+B / EMG.C+L / EMG.ALL / OFF5 / 10 / 12.5 / 15 / 20 / 25 / 50 / 100 kHz, or AUTOKEY / CONT / OFFLK KEY / LKDIAL / LK K+D /LK PTT / LK P+K / LK P+D / LK ALLFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual54Set (Menu) ModeFunction Selects the [VOL/SQL] key function.Toggles the display indication between “frequency” and the channel’s “Alpha/Numeric Tag.”Stores Alpha-Numeric “Tags” for the Memory channels.Enables/disables the Password feature.Stores the password.Sets the magnitude of the repeater Shift.Selects the Scan Resume mode.Selects the function of the [HM/RV] key.Adjusts the RF Squelch threshold level. Sets the Repeater Shift Direction.Enables/disables the Priority Revert feature.Selects the Receive-mode Battery Saver interval (“sleep” ratio) Selects the Smart Search Sweep mode.Selects the Memory Scan channel-selection mode.Enables/Disables the Scan lamp while paused.Selects the Memory Scan “Skip” channel-selection mode.Enables or disables “VFO Split” operation.Selects the Tone Encoder and/or Decoder mode. Indicate the current temperature inside the transceiver’s case.Setting of the CTCSS Tone Frequency.Setting of the TOT time.Enables/Disables the Transmitter Battery Saver.Select Wide (±5 kHz) or Narrow (±2.5 kHz) TX Deviation.Enables/Disables the Weather Alert Scan feature.AvAiLAbLe vALueS (deFAuLt: Bold ItalIc)MONI / T-CALLFREQ / ALPHA ---PWD.OFF / PWD. ON---0.00 - 99.95 MHz (0.60 MHz)BUSY / HOLD / TIME<REV> / <HOME>S-1 / S-2 / S-3 / S-4 / S-5 /  S-6 / S-8 / S-FULL / OFFRPT.OFF / RPT.– / RPT. +RVT.OFF / RVT. ON200 MS / 300 MS /500 MS / 1 SEC / 2 SSEC / OFFSINGLE / CONTONLY / MEMON / OFFOFF / SKIP / ONLYSPL.OFF / SPL. ONOFF / TONE / TSQL / REV TN / DCS / ECS---50 CTCSS tones (100 Hz)1MIN - 30MIN or OFF (6 MIN)SAV.OFF / SAV. ONWIDE / NARROWALT.OFF / ALT. ONSet Mode iteM 25 [M/TCAL]26 [NAME] 27 [NM WRT]28 [PASSWD]29 [PSWD W]30 [R SHFT]31 [RESUME]32 [REV/HM]33 [RF SQL] 34 [RPT.MOD]35 [PRI.RVT]36 [RXSAVE] 37 [S SRCH]38 [SCN MD]39 [SCN.LMP]40 [SKIP]41 [SPLIT]42 [SQL.TYP] 43 [TEMP]44 [TN FRQ]45 [TOT]46 [TXSAVE]47 [WID.NAR]48 [WX ALT]FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 55Set Mode Item 1 [ANI]Function: Enables/Disables the ANI function.Available Values: ANI.OFF/ANI. ONDefault: ANI. OFFSet Mode Item 2 [ANI.WRT]Function: Program the ANI Identier.See page 46 for details.Set Mode Item 3 [APO]Function: Setting of the Automatic Power-Off feature.Available Values: OFF/0.5H - 12.0 H in 0.5 hour multiplesDefault: OFFSet Mode Item 4 [AR BEP]Function: Selects the Beep option during ARTS operation.Available Values: INRANG/ALWAYS/OFFDefault: INRANGINRANG: Beeps sound only when the radio rst detects that you are within range.ALWAYS: Beeps sound every time a polling transmission is received from the other sta-tion (every 15 or 25 seconds when in range).OFF:  No alert beeps sound.Set Mode Item 5 [AR INT]Function: Selects the Polling Interval during ARTS operation.Available Values: 25 SEC/15 SECDefault: 25SECSet Mode Item 6 [ARS]Function: Enables/Disables the Automatic Repeater Shift function.Available Values: ARS. ON/ARS.OFFDefault: ARS. ONSet Mode Item 8 [BCLO]Function: Enables/Disables the Busy Channel Lock-Out feature.Available Values: BCL. ON/BCL.OFFDefault: BCL.OFFSet (Menu) ModeFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual56Set Mode Item 9 [BEEP]Function: Enables/Disables the beeper.Available Values: KEY+SC/KEY/OFFDefault: KEY+SCKEY+SC:  The beeper sounds when you press any key, or when the scanner stops.KEY:         The beeper sounds when you press any key.OFF:         Beeper is disabled.Set Mode Item 10 [BELL]Function: Selects the number of CTCSS/DCS Bell ringer repetitions.Available Values: OFF/1T/3T/5T/8T/CONT (Continuous ringing)Default: OFFSet Mode Item 11 [CLK.SFT]Function: Shifting of the CPU clock frequency.Available Values: SFT.OFF/SFT. ONDefault: SFT.OFFThis function is only used to move a spurious response “birdie,” should it fall on a de-sired frequency.Set Mode Item 12 [CW WRT]Function: Programs and activates the CW Identier (used during ARTS operation).See page 41 for details.Set Mode Item 13 [CWID]Function: Enables/disables the CW identier during ARTS operation.Available Values: TX OFF/TX ONDefault: TX OFFSet Mode Item 14 [DC VLT]Function: Indicates the DC Supply Voltage.Set Mode Item 15 [DCS.COD]Function: Setting of the DCS code.Available Values: 104 standard DCS codesDefault: DCS.023Set Mode Item 16 [DCS.N/R]Function: Enables/Disables “Inverted” DCS code decoding.Available Values: T/RX  N, RX  R, TX  R,  T/RX RDefault: T/RX NSet (Menu) ModeDCS CODE 023 025 026 031 032 036 043 047 051 053 054 065 071 072 073 074 114 115 116 122 125 131 132 134 143 145 152 155 156 162 165 172 174 205 212 223 225 226 243 244 245 246 251 252 255 261 263 265 266 271 274 306 311 315 325 331 332 343 346 351 356 364 365 371 411 412 413 423 431 432 445 446 452 454 455 462 464 465 466 503 506 516 523 526 532 546 565 606 612 624 627 631 632 654 662 664 703 712 723 731 732 734 743 754 – – – – – –FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 57Set Mode Item 17 [DT DLY]Function: Setting of the DTMF Autodialer Delay Time.Available Values: 50MS/100MS/250MS/450MS750MS/1000MSDefault: 450MSSet Mode Item 18 [DT SPD]Function: Setting of the DTMF Autodialer Sending Speed.Available Values: 50MS (high speed)/100MS (low speed)Default: 50MSSet Mode Item 19 [DT WRT]Function: Programming of the DTMF Autodialer.See page 44 for details.Set Mode Item 20 [EDG.BEP]Function: Enables/Disables the Band-edge beeper while selecting the frequency via the DIAL knob.Available Values: BEP.OFF/ BEP. ONDefault: BEP.OFFSet Mode Item 21 [EMG S]Function: Selects the alarm(s) utilized when the Emergency function is engaged.Available Values: EMG.BEP/EMG.LMP/EMG.B+L/EMG.CWT/EMG.C+B/EMG.C+L/EMG.ALL/OFFDefault: EMG.B+LEMG.BEP:  Loud “Alarm” sounds.EMG.LMP: The LCD/Keypad lamp ashes.EMG.B+L:  Loud “Alarm” sounds and the LCD/Keypad lamp ashes.EMG.CWT: Transmits the Morse Code “SOS” (• • • – – – • • •) message on the air be-ginning one minute after activation of the Emergency function.EMG.C+B:  Loud “Alarm” sounds and the Morse Code “SOS” (• • • – – – • • •) mes-sage is transmitted on the air beginning one minute after activation of the Emergency function.EMG.C+L:  The LCD/Keypad lamp ashes, and the Morse Code “SOS” (• • • – – – • • •) message is transmitted on the air beginning one minute after activation of the Emergency function.EMG.ALL:  All of the above are activated.OFF: Disables the Emergency function.When the radio  is set to  the EMG.CWT, EMG.C+B,  EMG.C+L, or EMG.ALL mode, the radio  will be  instructed to  send “DE  (your callsign)”  after the  sending of  the SOS message, if your callsign is entered via Set Mode Item 13: CWID.Set (Menu) ModeFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual58Set Mode Item 22 [F STEP]Function: Setting of the synthesizer steps.Available Values: 5/10/12.5/15/20/25/50/100 kHz, or AUTODefault: AUTO (Step automatically changes according to operating frequency.)Set Mode Item 23 [LAMP]Function: Selects the LCD/Keypad Lamp mode.Available Values: KEY/CONT/OFFDefault: KEYKEY:  Illuminates the Keypad/LCD lamp for ve seconds when you rotate the DIAL knob or press the keypad or any switch (except PTT switch). This is the facto-ry-programmed default setting.CONT:  Illuminates the Keypad/LCD lamp continuously.OFF:  Disables the Keypad/LCD lamp.Set Mode Item 24 [LOCK]Function: Selects the Control Locking lockout combination.Available Values: LK KEY/LKDIAL/LK K+D/LK PTT/LK P+K/LK P+D/LK ALLDefault: LK K+DNote: “K” = “Key;” “D” = “Dial;” and “P” = “PTT.”Set Mode Item 25 [M/TCAL]Function: Selects the [VOL/SQL] key function.Available Values: MONI/T-CALLDefault: Depends on the transceiver version.MONI:  Pressing the [VOL/SQL]  key  causes  the  Noise/Tone Squelch  to be  over-ridden, allowing you to listen for weak (or non-encoded) signals.T-CALL: Pressing the [VOL/SQL] key activates a 1750-Hz burst tone, used for repeater access in many countries (especially in Europe).Set Mode Item 26 [NAME]Function: Toggles the display indication between “frequency” and the channel’s “Alpha/Numeric Tag.”Available Values: FREQ/ALPHADefault: FREQSet Mode Item 27 [NM WRT]Function: Stores Alpha-Numeric “Tags” for the Memory channels.See page 24 for details.Set Mode Item 28 [PASSWD]Function: Enables/disables the Password feature.Available Values: PWD.OFF/PWD. ONDefault: PWD.OFFSet (Menu) ModeFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 59Set Mode Item 29 [PSWD W]Function: Stores the password.Available entries are 0-9, A, B, C, D, E, and F.Set Mode Item 30 [R SHIFT]Function: Sets the magnitude of the repeater Shift.Available Values: 0.00 - 99.95 MHz (50 kHz increments)Default: Depends on the operating band and transceiver version.Set Mode Item 31 [RESUME]Function: Selects the Scan Resume mode.Available Values: BUSY/HOLD/TIMEDefault: BUSYBUSY:  The  scanner  will  hold  until the signal disappears, then will  resume  when  the carrier drops.HOLD: The scanner will stop when a signal is received, and will not restart.TIME:  The scanner will hold for the ve seconds, then resume whether or not the other station is still transmitting.Set Mode Item 32 [REV/HM]Function: Selects the function of the [REV(HOME)] key.Available Values: <REV>/<HOME>Default: <REV><REV>:  Pressing the [REV(HOME)] key reverses the transmit and receive frequencies during repeater operation.<HOME>: Pressing the [REV(HOME)] key instantly recalls a favorite “Home” channel.Set Mode Item 33 [RF SQL]Function: Adjusts the RF Squelch threshold level.Available Values: S-1/S-2/S-3/S-4/S-5/S-6/S-8/S-FULL/OFFDefault: OFFSet Mode Item 34 [RPT.MOD]Function: Sets the Repeater Shift Direction.Available Values: RPT.OFF/RPT. –/RPT. +Default: Depends on the transceiver version, as well as the setting of Set Mode Item 4: ARS.Set Mode Item 35 [PRI.RVT]Function: Enables/disables the Priority Revert feature.Available Values: RVT.OFF/RVT. ONDefault: RVT.OFFSee page 36 for details.Set (Menu) ModeFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual60Set Mode Item 36 [RXSAVE]Function: Selects the Receive-mode Battery Saver interval (“sleep” ratio)Available Values: 200 MS(1:1)/300 MS(1:1.5)/500 MS(1:2.5)/1 S(1:5)/2 S(1:10)/OFFDefault: 200 MSSet Mode Item 37 [S SRCH]Function: Selects the Smart Search Sweep mode.Available Values: SINGLE/CONTDefault: SINGLESINGLE:  The transceiver sweeps the current band once in each direction, starting on the current frequency. All channels where activity is present (up to 15 in each direction) are loaded into the Smart Search memories. Whether or not all 31 memories are lled, the search stops after one sweep in each direction.CONT:  The  transceiver makes  a sweep  in  each direction  as with  the  “SINGLE” mode, but if all 31 channels are not lled after the rst sweep, the radio con-tinues sweeping until they are all lled.Set Mode Item 38 [SCN MD]Function: Selects the Memory Scan channel-selection mode.Available Values: ONLY/MEMDefault: MEMONLY:  The scanner will only scan channels that are agged (Preferential Scan List).MEM:   The scanner will “skip” the agged channels during scanning.Set Mode Item 39 [SCN.LMP]Function: Enables/Disables the Scan lamp while paused.Available Values: ON/OFFDefault: ONSet Mode Item 40 [SKIP]Function: Selects the Memory Scan “Skip” channel-selection mode.Available Values: OFF/SKIP/ONLYDefault: OFFSKIP:    The scanner will “skip” the agged channels during scanning.ONLY:  The scanner will only scan channels that are agged (Preferential Scan List).OFF:     All memory channels will be scanned (the “ag” will be ignored).Set (Menu) ModeFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 61Set Mode Item 41 [SPLIT]Function: Enables/Disables split CTCSS/DCS coding.Available Values: SPL.OFF/SPL. ONDefault: SPL.OFFWhen this Set Mode Item is set to “SPL. ON,” you will see the following additional pa-rameters after the “DCS” parameter while conguring Set Mode Item 44: SQL.TYP.D:           DCS Encode only.T DCS:   Encodes a CTCSS tone and Decodes a DCS code.D TSQL: Encodes a DCS code and Decodes a CTCSS tone.Select the desired operating mode from the selections shown above.Set Mode Item 42 [SQL.TYP]Function: Selects the Tone Encoder and/or Decoder mode.Available Values: OFF/TONE/TSQL/REV TN/DCS/ECSDefault: OFFTONE:    CTCSS EncoderTSQL:     CTCSS Encoder/DecoderREV TN: Reverse CTCSS Decoder (Mutes receiver when matching tone is received)DCS:       Digital Coded Encoder/DecoderECS:       Enhanced Paging & & Code SquelchNote: See also Set Mode Item 41: SPLIT regarding additional selections available dur-ing “Split Tone” operation.Set Mode Item 43 [TEMP]Function: Indicate the current temperature inside the transceiver’s case.Set Mode Item 44 [TN FRQ]Function: Setting of the CTCSS Tone Fre-quency.Available Values: 50 standard CTCSS tonesDefault: 100.0 HzSet Mode Item 45 [TOT]Function: Setting of the TOT timeAvailable Values: 1MIN - 30MIN or OFFDefault: 6MIN (minutes)The time-out timer shuts off the transmitter after continuous transmission of the pro-grammed time.Set (Menu) ModeCTCSS TONE FREQUENCY (Hz)    67.0    69.3    71.9    74.4    77.0    79.7    82.5    85.4    88.5    91.5    94.8    97.4 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 159.8 162.2 165.5 167.9 171.3 173.8 177.3 179.9 183.5 186.2 189.9 192.8 196.6 199.5 203.5 206.5 210.7 218.1 225.7 229.1 233.6 241.8 250.3 254.1 – – – –FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual62Set Mode Item 46 [TXSAVE]Function: Enables/Disables the Transmitter Battery Saver.Available Values: SAV.OFF/ SAV. ONDefault: SAV.OFFSet Mode Item 47 [WID.NAR]Function: Select Wide (±5 kHz) or Narrow (±2.5 kHz) TX Deviation.Available Values: WIDE/NARROWDefault: WIDENote: If “Narrow” is selected, the receiver audio level is increased slightly to compen-sate for the reduced deviation. The receiver IF lter bandwidth is not changed via this setting.Set Mode Item 48 [WX ALT]Function: Enables/Disables the Weather Alert Scan feature.Available Values: ALT.OFF/ALT. ONDefault: ALT. OFFSet (Menu) ModeFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual 63General Frequency Ranges:           RX 136 - 174 MHz                                        TX  144 - 146 (148) MHzChannel Steps:                  5/10/12.5/15/20/25/100 kHzFrequency Stability:          ±2.5 ppm @ 14º to 140º F (–10° to +60° C)Repeater Shift:                 ±600 kHz Emission Type:                 F2 , F3Antenna Impedance:     50 Supply Voltage:                 Nominal:   7.4 V DC(Negative Ground)             Operating: 5.0 ~ 10.0 V DC (EXT DC Jack)Current Consumption:      200 mA (Receive, 200 mW output)(Approx. @7.4 V)               70 mA (Standby, Saver Off)                                        25 mA (Standby, Saver On)                                        0.5 mA (Auto Power Off)                                        1.6 A (5 W TX)Operating Temperature:   –4º to 140º F (–20 °C to +60 °C)Case Size:                         2.45” (W) x 4.74” (H) x 1.52” (D) (62  x 120.5  x 38.5  mm)                                        (W/O knob, antenna, & belt clip)Weight:                             9.9 Oz (280 g) with FNB-124LI, antenna, and belt clipTransmitterRF Power Output:             5.0 W (High) / 2.0 W (Middle) / 0.5 W (Low)  (@7.4 V)Modulation Type:             Variable Reactance F2, F3Maximum Deviation:        ±5.0 kHz (F2, F3)Spurious Emission:           At least 60 dB down (@ High and Middle power)                                        At least 40 dB down (@ Low power)Microphone Impedance:   2 kReceiverCircuit Type:           Direct-ConversionSensitivity:                       0.2 µV for 12 dB SINAD (144-148 MHz)                                        0.16 µV for 12 dB SINAD (Out of Amateur band)Selectivity:                        12 kHz/35 kHz (–6 dB /–60 dB)AF Output:                       800 mW @ 16  for 10 % THD (Internal Speaker)(@ 4.8 V)Specications  are  subject  to  change  without  notice,  and  are  guaranteed  within  the 144 MHz amateur band only. Frequency ranges and functions will vary according to transceiver version; check with your dealer.SpecicationsFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
FT-252 OperaTing Manual64NoteFCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
1. ChangesormodicationstothisdevicenotexpresslyapprovedbyYAESUMUSENcouldvoidtheuser’sauthorizationtooperatethisdevice.2. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference including received, interference that may cause undesired operation.3. The scanning receiver in this equipment is incapable of tuning, or readily being altered, by the User to operate within the frequency bands allocated to the Domestic public Cellular Telecommunications Service in Part 22.WARNING:MODIFICATIONOFTHISDEVICETORECEIVECELLULARRADIOTELEPHONESERVICESIGNALSISPROHIBITEDUNDERFCCRULESANDFEDERALLAW.DECLARATION BY MANUFACTURERThe Scanner receiver is not a digital scanner and is incapable of being convertedormodiedtoadigitalscannerreceiverbyanyuser.FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.
Copyright 2013YAESU MUSEN CO., LTD.All rights reserved.No portion of this manualmay be reproducedwithout the permission ofYAESU MUSEN CO., LTD.Printed in JapanEH053N100FCC ID: K6620533X20 / IC: 511B-20533X20YAESU MUSEN CO., LTD.

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