Tekk BCH-220 Scanning Receiver User Manual Scanning receiver English Manual

Tekk International Inc. Scanning Receiver Scanning receiver English Manual

User Manual

 Content  Brief Introduction Thank you for buying scanning receiver. The goal is to provide cost-effective communication equipment for a variety of business sites and the amateur and supply all fast-paced walks of life with perfect communication solutions. This product uses amateur frequency ,you need to apply for use to radio management institution of the provinces, cities or autonomous regions . please read this manual carefully in order to know how to properly operate the radio before use.    Unpacking and Checking Equipment Welcome to use radios, before using we suggest you: ·Please check the packing box of this product and see if there are signs of damage. ·Please open the packing box carefully. We recommend that you identify the items listed in the following packing list. if you find that our product and its accessories in handling are lost or damaged during the shipment. Please immediately contact dealers.  Parts List  Item Quantity Rubber Antenna  1 Li-ion Battery Pack  1 Desktop Charger  1 Power Adapter  1 Belt Clip  1 User’s Manual  1 Warranty Card  1 Hand Strap  1
  Preparation Charging the Battery   1. Using the battery  The battery is not completely charged at the factory, please charge it before using. To extend the battery life time, please power off the battery when you don't use two way radio, and save battery in a cool (temperature less than 25  )and dry place.℃  2    Precautions of Charging Equipment 1. Do not expose the charger to rain or snow. 2. Do not operate the charger if it has received a sharp blow, or has been dropped or damaged in any way. 3. Do not disassemble the charger if it has received a sharp blow, or has been dropped or damaged in any way. 4. Never alter the AC cord or plug provided with the unit. If the plug will not fit the outlet, have the proper outlet installed by a qualified electrician. An improper condition can result in a risk of electric shock. 5. To reduce the risk of damage to the cord or plug, pull the plug rather than the cord when disconnecting the charger from the AC receptacle. 6. To reduce the risk of electric shock, unplug the charger from the outlet before attempting any maintenance or cleaning. 7. Use of an attachment not recommended or sold by JUSTON may result in a risk of fire, electric shock, or personal injury. 8. Make sure the cord is located so it will not be stepped on, tripped over, or subjected to damage or stress. 9. An extension cord should not be used unless absolutely necessary. Use of an improper extension cord could result in a risk of fire and/or electric shock. If an extension cord must be used, make sure that: •The pins on the plug of the extension cord are the same number, size, and shape as those on the plug of the charger. •The extension cord is properly wired and in good electrical condition. •The cord size is 18 AWG for lengths up to 100 feet, and 16 AWG for lengths up to 150feet. 10. Do not replace charger's power cord. If the power cord damages, you must stop using charger immediately.     3. Charging the Battery   Please use the battery charger designated by to charge battery. After purchase or extended storage (more than two months), the first time to charge battery cannot make battery reach its normal operating capacity. After repeating charge /discharge it two or three times, the operating capacity will increase to its normal capacity.
  4. Please Charge the Radio According to Operation Steps as Follows: 1. Insert power adapter into power supply socket. 2. Insert output terminal of power adapter into DC jack behind the charging kit, now the charging orange indicator lights about 2 seconds then goes out. 3. Insert the battery or radio equipped with battery into the charging kit. 4. Confirm the battery and charging kit terminal contact reliably, when charging indicator light turns into red and charging starts. 5. After completion of charge (charging time about 5 hours), light turns to be green.   5. Indicators Display As Following:  Status Indicator Power Connected  Orange light is on about 2 seconds then goes out No battery(temperature end judges)  All go out Charge normally    Red light is on The battery is fully charged  Green light is on Fault (over temperature, battery short circuit or over discharge state)   Red light flashes  Note: Before charging, please turn off radio power equipped with battery. When charging, using radio will interfere with normal charge of battery and receiver effect.   Basic operations   Power On/Off                  Turn the power switch knob clockwise to turn on radio power; to turn it off ,turn the power switch knob counter-clockwise.   Volume Control             Turn the volume switch knob clockwise to increase volume; to decrease the volume, rotate the volume switch knob counter-clockwise.   RX When radio receiving information ,green LED lights . 1) Only same signaling and CTCSS setting can receive information . 2) May not receive any calling if radio is at lower signal and set high level SQL. 3) Local dealer maybe program your radio with CTCSS/DCS . Users can receive the same signaling information if chosen channel with CTCSS/DCS . Or it can not get any calling .
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     Program Settings   Radio Basic Information   1) Frequency    Please type in desired frequency value.    2) Back to factory default settings    You can initialize factory default settings by program software.   3) Delete Channel Group   You can delete the chosen channel by program software .   4) Turn On SP   Turn on speaker, you can hear sound from radio when it receives correct signaling.    Optional Items   1)Alarm before TOT       You can set an alert tone sounds from the speaker before TOT is cut.  2)Voice Report   Your radio can choose different languages voice report : English ,Chinese ,Off .  1) Beeper of Radio Power On   Choose desired beeper to sound when turn on the radio .  2) SQL  The purpose of the squelch is to mute the speaker when no signals are present. With the squelch level ( 0-9) correctly set , you will hear sound only while actually receiving signal. The higher the selected squelch level, the stronger the signals must be when receive.  The appropriate squelch level depends on ambient RF noise conditions.   3) Key Lock 1.Long press this key with lock icon . 2.Auto-lock: Set time to active auto-lock .It will be invalid when turn on radio again . 3.Auto-lock + memory : Set time to active auto-lock .It will be valid when turn on radio again.
 4) Working Mode   Frequency:    LCD display frequency value. Channel:        LCD display channel No. Frequency +Channel: LCD display both modes . 5)Frequency Step   There are 2.5K ,6.25K .........100K for selectable.  7)Back Light Choose to turn on/off backlight and set lighting duration.  9)Channel Name Display Only available at channel mode . Tick √: Display   Not tick √: No Display    10)Beeper  Turn beeper on/off . If turn off beeper ,key tone and power on tone will not be available .    11)Decode Tail Elimination by Frequency Without CTCSS/DCS Decode Tail tone elimination by frequency at channel without CTCSS/DCS decode .  12)Encode Tail Elimination by Frequency Without CTCSS/DCS Encode Tail tone elimination by frequency at channel without CTCSS/DCS encode .    13)Key Lock Enable the key lock function.  14)UP/DOWN Lock Enable UP/DOWN lock function.  15)Support Non-standard CTCSS and DCS Your radio can set any desired non-standard CTCSS and DCS    Scan   Scan Mode   According to chosen scan mode ,radio stops or continues to scan.  1)Time Mode: Your radio stops scanning when detecting a signal for some while(approximately 5 seconds).and then continues to scan even if the signal is still present.  2)Carrier Mode: Your radio stops scanning when detecting a signal and remains on the same channel until the signal drops out.  3)Search Mode : Radio stops at the scanned frequency or channel when detecting a signal.
   Delay Time Between RX and Scanning You can set the time of radio automatically back to scanning after RX .  Scanning Beeper On/Off   Your radio can turn on/off scanning beeper.  Scan Indicator       Turn on green light flashes when scanning.   Battery   Battery Save The battery saver function decreases the amount of   power used when a signal is not being received and no operations are being performed ( no keys are being and no switches are being turned ). But when your radio receives information first time ,the delay time will be longer .   Low Battery Beeper Type You can choose the desired beeper for low battery alert.   Low Battery Alert Interval Set the interval by every low battery alert .   APO  Radio will automatically turn off power if there is no operation within 5 minutes and alarm at interval time before APO .Under APO mode, user can active radio by operating it again. Off : Turn off APO function   APO Time : Turn on this function and set the time to auto power off as requested .   Low Battery Voice Report   Radio will report low battery state if active this function     APO at High Voltage Radio automatically power off if the voltage higher than pre-set voltage value.   APO at Low Voltage Radio automatically power off if the voltage lower than pre-set voltage value.   Emergency Call 1) Emergency Call Type     Local Emergency : Alert from radio .   Local Emergency + Remote Emergency: Alert from radio ,same as other radios with the same frequency and same signaling .
    2) Local Emergency Time   Continuous : Keep alerting     Limited time setting :Choose the desired time    3) Remote Emergency RX Time     Continuous : Keep alerting     Limited time setting :Choose the desired time   4) Emergency Call Circle Time    Choose desired circle time to make emergency call.   5) Channel Select   Assigned Channel : Suppose assigned at Channel 3 ,no matter what the present channel is ,alarm always goes from Channel 3.  Present Channel: Suppose present channel is No.5 ,alarm from Channel 5.   Present channel is No.6 ,alarm goes from Channel 6.    6) Emergency Channel No.   Choose desired channel number from Group A and Group B as emergency channel.  First/Quick Channel ◆First Channel Choose desired channel as first channel    ◆Quick Channel   Choose desired channel as quick channel  Power On Settings 1) Display Information   Off: Display all functions’ icon.       Voltage :only display voltage value   Display Information :edited by user   2) Power On Message     Please edit the desired information by program for Group A and Group B.  3) Password to Power on   Radio default is to be no password .Users can freely set.  4) Password to Reset All Settings     Enable this function ,radio will back to pre-set state .
  FM Radio   1) Monitor at FM Radio     Tick: RX available during FM radio working       No tick: No RX available during FM radio working       Note: Radio can monitor group A and group B at same time while listening to FM radio .    2) Working Mode     Full Frequency :makes FM radio work in Full frequency .     Channel: makes FM radio work in memorial channel .    3)FM SQL     Choose desired SQ level :1-32     4)FM VOL    Adjust desired FM Volume      5) FM Present Channel      Set the default channel when turn on FM radio    Input Information   This function allow radio input and store at most 16 letters or numbers , Chinese words. It also can be used to store SN-code, identification for Program ID ,ID and so on .  DTMF Settings   Encode DTMF   ■  Pre-carrier Frequency Duration :  Set sending pre-carrier frequency duration before sending DTMF ,so that you can get more accurate and stable information .Choose desired duration from 0-5100 ms.    ■  DTMF Code Interval : Set interval between ending sent DTMF and next DTMF , Choose desired interval from 80-2450 ms.  ■   Side Tone  This tone is for checking if the DTMF code sent by using radio.  ■   DTMF Key Lock You can lock the desired DTMF key
 Decode DTMF   ■  ID Code  The ID code is consisted of 1-10 digits .Radio decodes right DTMF when receiving matched radio with programmed DTMF signaling .    ■  Auto Reset Timer  If there is no communication after decoding DTMF code, DTMF code will be reset and make the speaker quiet .Timer starts counting from stopping receiving carrier signal.    ■  ID Group Calling Define a universal group code by DTMF character A,B,C,D, *、#. Radio can decode if receiving right ID code and one or all code will replaced by this universal code . For example :     Group C    Station 1  Station 2  Station 3  Station 4 Code  123 223 235 355 Calling C23  Station 1 and 2 called Calling CC5  Station 3 and 4 called Calling CCC  All Station Called  ■  Calling Alert  Indicator alert when receiving matched signaling.  ■  Calling Alert Beeper Beeper alter when receiving matched signaling.  ■  ANI  Active this function to display the sender’s ID . You can choose desired function :turn on/turn off.    ■  Contact List Edit and name sender’s ID on the log by programming software. You can choose desired function :turn on/turn off.   Stun/Kill  1) Kill Code Kill radio when it receives assigned code .Decode unless receive kill decode Stun+#.  2) Kill Group Code Similar as ID Group Code . For example :
 Group C      Station 1  Station 2  Station 3  Station 4 Code  123 223  235  355 Base sending Kill Code C23  Station 1 and 2 killed. Base sending Kill Code CC5  Station 3 and 4 killed Base sending Kill Code CCC  All Station killed    Note: Whatever radio power on again or not ,radio still memory the stun/kill function.  Automatically Dial List   Set DTMF code for every auto dial list .  Phone Book   Before dialing ,user input DTMF code which matched with desired person ,then quick to find out desired person’s number.    Two Tone    Two Tone List Set value for every two tone group.   Pre-carrier Frequency Duration     Set sending pre-carrier frequency duration before two tone code sending ,so that users can get   more accurate and  stable information .   Adjusting Volume for Two Tone ,End Tone and DTMF You can choose desired volume level for two tone ,end tone and DTMF.   Auto Reset Timer If there is no communication after decoding two tone code, The two tone code will be reset and make the speaker quiet .Timer starts counting from stopping receiving carrier signal. .  Side Tone   Enable radio reports when sending two tone.
  Key Settings  Key Instructions   ●Working Modes 1)Frequency Mode (VFO)       Change to VFO mode with pressing  and then turn radio power on. Under this mode ,you can press    to choose full frequency or channel display and change the frequency or channel number by pressing ,or directly input desired frequency value /channel number .   2)Channel Mode       Change to CH mode with pressing   and then turn radio power on .Under this mode ,you can press  to choose desired channel number or directly input channel number. But before this operation ,you should memory the channel.  3)FM Mode Change to FM Radio mode with pressing    and  .Under this mode, you can press  to change the FM radio frequency. Press    or  +    to scanning the FM frequency /channels. Long press    to scan the FM frequency and memory .   4)Menu Mode        Press   and numeric key 9 to enter the menu ,then press to choose desired item and set。More details please refer to “Menu Operations”.  ●Numeric Key Inputting
 1. In CH or CH/VFO mode, you can input three numbers to change present channel. If channel numbers have stored frequency in radio channel, then it turns to desired channel ; If not ,back to the original channel . For example : CH1 (input 001) , CH 98 (input 098)             CH123 ( input 123) 2. In VFO mode, you can input numbers to change frequency. After inputting 6 digits frequency value, radio will work at desired frequency. If not, back to the original working frequency .   ●Channel Storing 1. The channel storing should operate under the frequency mode . 2. Press  ,then press  to start storing operation. You will see the            icon on the left top of LCD and flashes .   3. Press    to store the channel or directly input numbers as channel number . 4. Press    to confirm the storing . Press    to cancel it and back to previous menu or press    to cancel it and back to main menu ,.Press    to cancel the setting .    ●Channel Deleting   1. Channel deleting should be operated under channel mode . 2. Press   to turn radio power on and get channel deleting state .You will see the channel number on the left top of LCD and display the flashing                        icon. 3. Press  to choose desired deleted channel number or directly input channel number and delete ,then press    to confirm . 4. Radio will automatically turn to next channel after deleting .If there is no channel with frequency value ,radio will quit channel deleting and back to full frequency mode .  ●SQL 1. Press   and numeric key 1 ,LCD will display               and start to set the SQL level (Level 0-9) 2. Press    to choose desired SQL level. 3. Press    to confirm the setting. Press    to cancel it and back to previous menu or press    to cancel it and back to main menu ,.Press    to cancel the setting. ●Frequency Step SQL  5 SAVE DEL
 1. Press  and numeric 4 ,LCD will display            and start to set the frequency step :2.5K、5K、6.25K、10K、12.5K、15K、20K、25K、30K、50K、100K. 2. Press  to choose desired step. 3. Press    to confirm the setting. Press    to cancel it and back to previous menu or press   to cancel it and back to main menu ,.Press   to cancel the setting.(Available in frequency mode  )  ●Frequency Reverse On/Off      Press   and numeric 3 to exchange the frequency reverse function .You cannot operate reverse frequency if there is no frequency on the channel .    ●Offset Setting   Press    and numeric key 5 to get the offset direction setting .(Available for frequency mode)   ●Scanning  1 Press    and numeric key 6 to start scanning .   2 Press  to change scanning direction during scanning .   3 Under VFO mode ,radio will scan all the band at present frequency step   4 Under Channel mode ,radio will scan all 199 channels which program with frequency value .   5 Under FM mode , radio will scan all the frequency /channel. Scanning will not be active if radio has less than 2 channels with frequency value and no more adding channels. ●RX CTCSS/DCS 1 Press   and numeric key 7 ,LCD will display               and start to CTCSS/DCS setting . 2 Press    to exchange CTCSS and DCS. See followings: OFF  → CTCSS →  DCS N  →   OFF 3 Press    to exchange DCS direction. See followings:   DCS N → DCS I 4 Press  to choose desired CTCSS/DCS. 67.0 6.25K
 5 Directly input numeric key 0-9 to get desired CTCSS/DCS. See followings : Input 102.5Hz for CTCSS. a) Press    to exchange CTCSS and DCS. b) Input numbers : 1,0,2,5。 c) Same operation for DCS input. 6 Press    to confirm the setting. Press    to cancel it and back to previous menu or press   to cancel it and back to main menu ,.Press   to cancel the setting.(Note :You cannot set the RX signaling when radio in channel mode .)   Side-Keys Programming Function See following side-key functions:   English Details OFF No function available SCAN Scanning frequency/memorial channel ,press any key except [▲] / [▼] to quit scanning . VOX Turn on/off VOX  MONITOR  Stop/Start monitor the CTCSS or DCS ,meanwhile radio automatically turn on SQL when receives carrier signal. FM RADIO  Turn on/off FM radio FIR CH  exchange to the first channel SEC CH  exchange to quick channel SQL OFF  Turn on SQL and while receive carrier signal ,radio speaker actives. SQL MOM  Active this SQ , and keep at SQ state when radio receives carrier wave (Short press is invalid for this function)    Operation Instructions BEEPER ON/OFF Press   and   ,choose BEEPER by   and LCD displays           ,then press   and   to choose ①ON ;②OFF. After that ,press    to confirm   and back to selected item . Press    to cancel setting and back to previous item or press    to cancel setting and back to main menu.    BEEP
 BACK LIGHT Press   and   and choose LIGHT by   and LCD displays              Then press   and   to choose ①ON;  ②OFF.  ③Choose desired timing to keep lighting. After that ,press    to confirm    and back to selected item . Press    to cancel setting and back to previous item or press    to cancel setting and back to main menu.     KEY LOCK Press   and   ,choose LOC.KEY by  and LCD displays                . Then press   and   to choose ①MANU: Lock the key by manual ;②AT 5/.../30: Lock the key within defined timing and radio do not memory the auto key lock status if turn on again.; ③AS 5/…/30:Lock the key within defined timing and radio memory the auto key lock status if turn on again. After that ,press   to confirm  and back to selected item . Press   to cancel setting and back to previous item or press    to cancel setting and back to main menu.  BATTERY SAVE Press   and   ,choose SAVE by   and LCD displays            .Then press   and   to choose ①OFF;  ②1-1/1-2/.../1-10: Ratio for battery saving (1-1 highest battery consumption, 1-10 lowest battery consumption )After that ,press    to confirm   and back to selected item . Press   to cancel setting and back to previous item or press   to cancel setting and back to main menu.  VOX SWITCH Press   and   ,choose VOX SWI by   and LCD displays                 Then press    and    to choose ①OFF; ②ON. After that ,press    to confirm   and back to selected item . Press   to cancel setting and back to previous item or press   to cancel setting and back to main menu. VOX.SWISAVE    LOC.KEY   LIGHT
  VOX Press   and   ,choose VOX LEV by   and LCD displays                 Then press   and   to choose desired VOX level . After that ,press   to confirm    and back to selected item . Press    to cancel setting and back to previous item or press    to cancel setting and back to main menu.  POWER ON MESSAGE Press    and      ,choose PON MSG by    and LCD displays .Then press   and   to choose ①OFF: Display all icons .②DC: Display only voltage ;③MSG:Display only message  .After that ,press   to confirm  and back to selected item . Press    to cancel setting and back to previous item or press    to cancel setting and back to main menu.  APO  Press   and   ,choose APO by   and LCD displays         .Then press  and   to choose ①OFF; ②1H…24H: Timing for automatically power off . After that ,press    to confirm    and back to selected item . Press    to cancel setting and back to previous item or press    to cancel setting and back to main menu.  ROGER Press   and   ,choose ROGER by  and LCD displays              . Then  press   and   to choose ①OFF; ②ON. After that ,press    to confirm   and back to selected item . Press   to cancel setting and back to previous item or press   to cancel setting and back to main menu.  OFFSET Press   and   ,choose OFF SET by   and LCD displays OFF.SET  ROGER  APO  PON.MSG VOX.LEV
            .Then  press   and   to  choose  desired  frequency  difference receiving . After that ,press   to confirm  and back to selected item . Press   to cancel setting and back to previous item or press    to cancel setting and back to main menu.  WIDE/NARROW BAND Press   and   ,choose W/N by   and LCD displays            .Then press   and   to choose ①WIDE  ②NARR. After that ,press   to confirm   and back to selected item . Press   to cancel setting and back to previous item or press   to cancel setting and back to main menu.  SCANNING Press   and   ,choose SC MOD by   ,LCD displays               .Then press   and   to choose  ①SE: Searching ②CO: Carrier wave ;③TO:Tim.  After that ,press   to confirm  and back to selected item . Press   to cancel setting and back to previous item or press    to cancel setting and back to main menu.   SCANNING ADD/DEL Press   and  , choose SC ADD by   and LCD displays            .Then   press  and   to choose ①ADD:;②DEL: delete. After that ,press   to confirm    and back to selected item . Press    to cancel setting and back to previous item or press    to cancel setting and back to main menu.  VOICE  Press   and  , choose VOICE by  and LCD displays           .  Then press   and   to choose    ①CHS: Chinese; ②ENG: English ;③OFF. After VOICE  SC.ADDSC.MODW/N
 that ,press    to confirm    and back to selected item . Press    to cancel setting and back to previous item or press    to cancel setting and back to main menu.  ANI Press   and   ,choose ANI by   and LCD displays        . Then press  and   to choose ①ON ;②OFF. After that ,press    to confirm    and back to selected item . Press    to cancel setting and back to previous item or press    to cancel setting and back to main menu.  TOP KEY Press   and   , choose Top Key by   and LCD displays                Then press    and    to choose desired program function, more details can refer to the above keys programming definition. After that ,press    to confirm    and back to selected item . Press    to cancel setting and back to previous item or press    to cancel setting and back to main menu.   RESET Press   and   ,choose  reset  by   ,LCD  displays                  ,then press   and   to choose  ①VFO: reset all settings except memorial channels ②FULL:All settings. After that ,press    to confirm and back to selected item . Press    to cancel setting and back to previous item or press    to cancel setting and back to main menu.    RESET  TOP.KEY  ANI
  Troubleshooting  Symptom   Try This  No power      Battery power may have run out, please update battery or recharge it.  Battery may not be properly installed, please take it off and re-install. Battery lasts a short time after charge   The battery life is over, please replace new battery.  Can not talk to other members of your group.   Verify channel, frequency and code settings are correct. Hearing other conversation on a channel (not group members’)  Please change code settings, including all two way radio settings of your group.  Specifications and Parameters General Specification Device Number(D/N)  A31 Frequency Range  200-260 MHz Channel   199 channels Channel Spacing    Narrowband:12.5KHz CTCSS/DCS  50 CTCSS / 105 DCS Antenna Impedance  50 Ohm Working Temperature  –20  to ℃+50℃ Working Voltage  DC7.4v Battery Type  Li-ion battery Dimension(antenna excluding)  110.5( H )×58.5( W ) ×35.6(D)mm Weight (include antenna, battery)  About 230 grams
  Appendix I   CTCSS (Hz)  1-67.0 14-103.5 27-159.8 40-199.5 2-69.3 15-107.5 28-162.2 41-203.5 3-71.9 16-110.9 29-165.5 42-206.5 4-74.4 17-114.8 30-167.9 43-210.7 5-77.0 18-118.8 31-171.3 44-218.1 6-79.7 19-123.0 32-173.8 45-225.7 7-82.5 20-127.3 33-177.3 46-229.1 8-85.4 21-131.8 34-179.9 47-233.6 9-88.5 22-136.5 35-183.5 48-241.8 10-91.5 23-141.3 36-186.2 49-250.3 11-94.8 24-146.2 37-189.9 50-254.1 12-97.4 25-151.4 38-192.8  13-100.0 26-156.7 39-196.6   Appendix II     DCS 023 071 143 225 266 356 452 532 664 025 072 145 226 271 364 454 546 703 026 073 152 243 274 365 455 565 712 031 074 155 244 306 371 462 606 723 032 114 156 246 311 411 464 612 731 036 115 162 245 315 412 465 624 732 043 116 165 251 325 413 466 627 734 047 122 172 252 331 423 503 631 743 051 125 174 255 332 431 506 632 754 053 131 205 261 343 432 516 645  054 132 212 263 346 445 523 654  065 134 223 265 351 443 526 662
  FCC Statement  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 received, including   interference that may cause undesired operation.  Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.  The scanner receiver equipment meets the requirements of the FCC Rules, 15.121 (a) The scanner 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. Blocking of the cellular frequencies is implemented in the firmware of the unit’s main control central processing unit (CPU). Coverage of 824 - 849 MHz and 869 - 894 MHz is completely blocked, since it is done in the microprocessor, and cannot be re-enabled by any user-accessible procedure, including diode, resistor, or jumper changes, nor by connection of any external device such as a personal computer, nor by installation of any “special” enabling semiconductor device. The scanning receiver is designed so that the tuning, control and filtering circuitry is inaccessible.

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