Ritron RIT13-442 Handheld FM Transceiver User Manual 442 man

Ritron Inc Handheld FM Transceiver 442 man

User Manual

TYPE OF EXHIBIT: INSTRUCTION MANUALSFCC PART: 2.1033 (c)(3)MANUFACTURER: RITRON, INC.505 West Carmel DriveCarmel, IN 46032MODEL: SST-442TYPE OF UNIT: UHF-FM Handheld TransceiverFCC ID: AIERIT13-442DATE: May 11, 2001Included in this exhibit is a draft of the Maintenance and Operating Manual for RITRON Model PatriotSST-442 UHF-FM Handheld Transceiver.Specifically, this manual includes a technical description of the SST-442 sufficient to establish compliancewith the technical standards of the applicable rule part(s).This includes, but is not limited to, the following items required under FCC Part 2.1033 (c):(2) FCC Identifier.(3) A copy of the installation and operating instructions.(4) Type of emission.(5) Frequency range.(6) Range of operating power, and means to provide variation in operating power.(7) Maximum power rating.(8) DC voltage chart.(9) Tune-up procedure.(10) A description of all frequency determining and stabilization circuits. A description of the circuitsused to suppress spurious radiation, limiting modulation, and limiting power.(12) Drawing with labels for controls and complete circuit diagrams.Signed: Michael A. Pickard - Project Engineer
TWO-WAY RADIO BY RITRONRITRON MODEL SST-442UHF FM BAND PROGRAMMABLE HANDHELD RADIOMAINTENANCE / REPAIR / OPERATING MANUALFOR USE BY AUTHORIZED SERVICE/MAINTENANCE PERSONNEL ONLYSST-442-MRM REV ACOPYRIGHT 2001 RITRON, INC. • ALL RIGHTS RESERVEDRITRON, JOBCOM, and QUIET CALL, ARE REGISTERED TRADEMARKS OF RITRON, INC.
TABLE OF CONTENTS SST-442TOPIC PAGEIMPORTANT MAINTENANCE/REPAIR INFORMATION .. 1SPECIFICATIONSGENERAL......................................................................... 2CONTROLS ...................................................................... 2TRANSMITTER................................................................. 2RECEIVER........................................................................ 3BATTERY ......................................................................... 3INTRODUCTIONGENERAL......................................................................... 4Model Identification ..................................................... 4FCC REGULATIONSLicensing..................................................................... 4Safety Standards......................................................... 4BATTERY CARECHARGING....................................................................... 5PRECAUTIONS ................................................................ 5BATTERY REPLACEMENT.............................................. 5Fig. 1 Battery Replacement......................................... 5BATTERY MAINTENANCE............................................... 6BATTERY CONDITIONING .............................................. 6OPERATIONDESCRIPTION OF CONTROLS AND CONNECTORS..... 7Fig. 2 Controls and Accessory Connectors.................. 7RADIO OPERATIONOn-Off/Volume ............................................................ 8Receive....................................................................... 8Selective Signaling Squelch ........................................ 8Monitor........................................................................ 8Battery Saver .............................................................. 8Transmit...................................................................... 8Channel Selection ....................................................... 8WHAT THE RADIO TONES MEANPower On/Self Check “OK........................................... 9Error Tones ................................................................. 9Channel Select............................................................ 9Tone Squelch.............................................................. 9Recharge Battery Alert ................................................ 9OPTIONAL RADIO TONESReceiver Squelch Tone ............................................... 9Busy Channel Inhibit ................................................... 9Transmitter Time Out .................................................. 9BELT CLIP INSTALLATION.............................................. 9TROUBLESHOOTINGGeneral ..................................................................... 10Battery ...................................................................... 10Error Tones ............................................................... 10Tone Coded Squelch................................................. 10PROGRAMMING THE RADIOPTT (PUSH-TO-TALK) PROGRAMMINGFig. 3 Placing the Radio in Program / Readout Mode 11Reading Out a Radio Channel’s Content................... 11PTT Programming the Radio..................................... 12Return To Normal Operation ..................................... 12PTT Programming Mistakes...................................... 12Table 1 – PTT Programming Frequency Table.......... 13Table 2 – Quiet Call Codes and Frequencies ............ 13COMPUTER SOFTWARE COPYRIGHTS ...................... 13PC COMPUTER PROGRAMMING ................................. 13Programmable Features............................................ 14Description of Features ............................................. 15TOPIC PAGETHEORY OF OPERATIONINTRODUCTION .............................................................16POWER SUPPLY AND VOLTAGE DISTRIBUTION........ 16Power Strobe.............................................................16Low Battery Voltage Detection...................................16REFERENCE OSCILLATOR ...........................................16SYNTHESIZER ..............................................................16Pin Numbers..............................................................16Prescaler Divider / Synthesizer Controller..................16VCO / Buffer Amplifiers .............................................17Oscillator Modulation ................................................. 17DIGITAL POTENTIOMETERS......................................... 17RECEIVER ......................................................................17RF Amplifier...............................................................171st Mixer....................................................................18FM Receiver Subsystem............................................ 18Voice / Tone Conditioning in Receiver Mode .............18Voice Band ................................................................18Sub-Audible............................................................... 18Audio Amplifier .......................................................... 18ANTENNA SWITCHING / LOW-PASS FILTER............... 19TRANSMITTER ............................................................... 19Keying .......................................................................19+VTX Supply..............................................................19Power Amplifier ......................................................... 19Voice/Tone Conditioning in Transmit Mode ...............19Voice Band ................................................................19Sub-Audible............................................................... 19MICROCONTROLLER ....................................................20ALIGNMENT PROCEDURERECOMMENDED TEST EQUIPMENT............................ 21RADIO PREPARATION...................................................21REFERENCE FREQUENCY ........................................... 21MODULATION BALANCE ...............................................22TRANSMITTER TONE DEVIATION ................................ 22TRANSMITTER VOICE DEVIATION...............................22RECEIVER SENSITIVITY AND SQUELCH.....................22RECEIVER NOISE SQUELCH........................................23SYNTHESIZER ...............................................................23VOLTAGE CHARTMeasurement Conditions................................................. 24SST-442 Voltages ...........................................................24PARTS LISTSCHEMATIC REFERENCE PARTS LIST .......................27CASE ASSEMBLY PARTS LIST .....................................33SCHEMATIC AND PART PLACEMENT DRAWINGSTOP SIDE PART PLACEMENT....................................... 35BOTTOM SIDE PART PLACEMENT............................... 36SCHEMATIC – UHF RF ..................................................37SCHEMATIC – Signal Processing ................................... 38
IMPORTANT REPAIR / MAINTENANCE INFORMATION SST-4421Surface Mount RepairRITRON surface mount products require specialequipment and servicing techniques. Improperservicing techniques can cause permanent damageto the printed circuit boards and/or components,which is not covered by RITRON’s warranty. If youare not completely familiar with surface mountedcomponent repair techniques, RITRON recommendsthat you defer maintenance to qualified servicepersonnel.Precautions for Handling CMOS DevicesThis radio contains complementary metal-oxidesemiconductor (CMOS) devices, which requirespecial handling techniques. CMOS circuits aresusceptible to damage by electrostatic or high voltagecharges. Damage can be latent, with no failureappearing until weeks or months later. For thisreason, take special precautions any time youdisassemble the radio. Follow the precautions below,which are even more critical in low humidityenvironments.1) Storage/transport - CMOS devices that will bestored or transported must be placed inconductive material so that all exposed leads areshorted together. CMOS devices must not beinserted into conventional plastic “snow” orplastic trays of the type that are used for othersemiconductors.2) Grounding - All CMOS devices must be placedon a grounded bench surface. The technicianthat will work on the radio/CMOS circuit must begrounded before handling the radio. Normally,the technician wears a conductive wrist strap inseries with a 100K Ohm resistor to ground.3) Clothing - Do not wear nylon clothing whilehandling CMOS circuits.4) Power off - Remove power before connecting,removing or soldering a PC board that containsCMOS devices.5) Power/voltage transients - Do not insert orremove CMOS devices with power applied.Check all power supplies to be used for testingCMOS devices, making sure that no voltagetransients are present.6) Soldering - Use a grounded soldering iron forsoldering CMOS circuitry.7) Lead-straightening tools - When straighteningCMOS leads, provide ground straps for the toolused.PC Board Removal - Special ToolRITRON recommends using a knurled nut tool toremove the slotted knurled nuts that secure thecharge and audio jacks on top of the radio. You willneed two sizes of this tool, one for each jack size.Mouser Corporation  is one source, stock number382-0004 (2.5mm jack) and 382-0006 (3.5mm jack).You can reach Mouser sales and distribution centerat 1-800-346-6873.Properly Attach the Synthesizer ShieldThe synthesizer shield should not be removed, unlessa component must be replaced. This shield issoldered to the main PC board.Re-assembly - Speaker Magnet, Battery Voltageon Connector PinThe speaker magnet will pick up clipped leads andother small metal objects from your bench top. Eventiny objects on the diaphragm will cause the speakerto buzz. Make sure the speaker is free of foreignobjects before reassembling the radio.Radio Transmitter Power MeasurementsThe SST-442 was designed to produce 2 Watts ofTransmitter power at nominal battery voltage (+7.2VDC), throughout the radio’s operating frequencyrange. Measurements are made with the RITRONSST-SRVBD RF service module connected to theradio antenna terminal. The transmitter wasdesigned with close tolerances to prevent RF poweroutput from exceeding specifications and reducingbattery life.PCB and Firmware RevisionsChanges in circuit design, component values, andradio firmware are made occasionally to enhance theperformance of the SST-442. In general, the manualwill be periodically updated for component valuechanges without a change in the manual revisionlevel. Always refer to the Schematic Reference PartsList for the most recent component values. Changesin circuit design that require printed circuit boardrevision, or changes in firmware that significantly alterthe operating characteristics of the radio, will becovered in a revised manual.This manual is updated for the following revisions:SST-442-MRM Rev APCB Revision 1750270AFirmware Revision v06
SPECIFICATIONS SST-4422GENERALFCC ID: AIERIT13-442FCC Rule Parts: 22, 74, 90, 95Frequency Range: 450 to 470 MHzMax. Freq. Separation: 10 MHzRF Channels: Up to 10 Channels,Independent TX/RXfrequencies.Synthesizer Step Size: 12.5 KHzFrequency Stability: +/-2.5 PPM (-30 to +60 C)TX/RXTone/Code Signaling: CTCSS (Quiet Call)Digital Coded Squelch(Digital Quiet Call)Dimensions: 4.75”H x 2.2”W x 1.43”DWeight: 11.5 oz. with battery packEnclosure Material: Lexan PolycarbonateEnvironmental: Splash resistant andshock and vibration perRITRON Drop Test (6 ft.drop onto concrete on allsix sides)Antenna Fitting: 1/4" - 32 x 1/4" threadedExternal RF Test Jack: Antenna connector withRITRON SST-SRVBD testdeviceEarphone Jack: 3.5 mm, disconnects theinternal speaker forexternal earphone,speaker / microphone, orheadset. Also providescable connection for PCprogramming.Microphone/PTT/ 2.5 mm, for externalChg Jack: speaker/microphone,headset or RITRON modelBC-A wall charger.CONTROLSPush Button Controls: On/Volume Up, VolumeDown/Off, PTT, ChannelSpeaker Beep Indicators:On/Volume Up: Radio beeps channelnumber when turned on,followed by increasingaudio to adjust volume.Volume Down/Off: Decreasing audio to adjustvolume, with two toneswhen turned off.Both Volume Buttons: Alternates between ToneSquelch (single beep) andCarrier Squelch (twobeeps). If both buttonsare held down until theradio beeps repeatedly,squelch will be disabled.PTT: Programmable for a single“transmit beep”.Channel: Number of beeps indicateschannel.TRANSMITTERRF Power Output: 2 Watts @ +7.2 VDCWide Mode Narrow ModeEmission Designator: 16K0F3E 11K0F3EDeviation: +/- 5.00 KHz +/- 2.50 KHzFM Hum and Noise: -43 dB -37 dBAudio Distortion:< 3 %Spurious & Harmonics: -50 dBcAudio Response: Meets FCC and EIArequirementsTime-out Timer: 60 seconds,programmable
SPECIFICATIONS SST-4423RECEIVERWide band Narrow bandModels ModelsModulation Acceptance: +/- 7.0 KHz +/- 3.75 KHzSensitivity: 0.25 µV 0.25 µV(12 dB SINAD)Adjacent Channel (EIA): -60 dB -50 dBSpurious Rejection: -60 dB -60 dBImage Rejection (EIA): -70 dB -70 dBIntermodulation (EIA): -56 dB -57 dBNoise Squelch Programmable perSensitivity: channel, factory set for 12dB SINADFrequency Response: 300 - 3000 Hz, de-emphasizedAudio Output 1 Watt into 8 Ω, with lessthan 5 % THD @ theearphone jackReceiving System: Dual conversionsuperheterodyneI.F. System: 1st - 43.65 MHz,2nd - 450 KHzL.O. Injection: Low sideQC/DQC Decode Time: per EIA StandardsBATTERYBattery Pack: +7.2 VDC, 800 mAHrechargeable NiCd batterypack standard+7.2 VDC, 1500 mAHrechargeable MiMHbattery pack optionalBattery Drain:Standby: 52 mASleep: 12 mAAvg. Standbywith Power Saver: 24 mAReceive: 125 mATransmit: 850 mA @ 2 WattsBattery Life @ 90/5/5 Duty Cycle withStandard battery pack (800 mAH):12.7 Hrs, Battery Saver On8.4 Hrs, Battery Saver OffBattery Life @ 90/5/5 Duty Cycle withHigh capacity battery pack (1500 mAH):23.7 Hrs, Battery Saver On15.7 Hrs, Battery Saver Off
INTRODUCTION SST-4424GENERALRITRON's SST-442 handheld is a small,programmable two-way radio, designed to operate inthe 450-470 MHz professional FM communicationsband. This handheld features push-button operatingcontrols, with the Push-To-Talk and Channel buttonson one side of the radio. The On / Volume Up andVolume Down / Off, volume and monitor controls areon top.Each radio can be “dealer” programmed to contain aunique set of operating frequencies and options.Selective signaling options include Quiet Call(CTCSS) and Digital Quiet Call (DCS). Transmitterpower, operating bandwidth and battery saver areamong the options programmable on a per channelbasis.Model IdentificationThe SST-442 model, serial number and FCCIdentification are displayed on a label located on theback of the radio beneath the belt clip.FCC REGULATIONSLicensingThe FCC requires the radio owner to obtain a stationlicense for his radios before using them to transmit,but does not require an operating license or permit.The station licensee is responsible for ensuring thattransmitter power; frequency and deviation are withinthe limits specified by the station license. The stationlicensee is also responsible for proper operation andmaintenance of the radio equipment. This includeschecking the transmitter frequency and deviationperiodically, using appropriate methods.Safety StandardsIn 1991 the Institute of Electrical and ElectronicsEngineers (IEEE), and in 1992 the American NationalStandards Institute (ANSI) updated the 1982 ANSIstandard for safety levels with respect to humanexposure to RF energy. Over 120 scientists,engineers, and physicians from universities,government health agencies, and industry, afterreviewing the available body of research, developedthis updated Standard. In March 1993 the FederalCommunications Commission (FCC) proposed theadoption of this updated Standard.The SST-442 handheld radio is designed to complywith this Standard. To limit your exposure to levelsat, or below, the levels in the Standard, pleaseobserve the following:• Use only the antenna(s) available from RITRONfor this model. DO NOT attempt to substitute anyother antenna.• Keep talk times as short and infrequent aspossible. DO NOT depress the PTT button whennot actually wishing to transmit. The radio isequipped with an internal timer to limit continuoustransmit times.• When transmitting, hold the radio in front of themouth at a distance of at least 4 inches. DO NOThold the radio in such a manner that the antennais next to, or touching, exposed parts of the body,especially the face or eyes while transmitting.• In belt mounted applications, when transmitting,remove the radio from the belt and hold away fromthe body at least 4 inches.• When using external headset accessories, holdthe unit away from the body at least 4 inches whiletransmitting.• DO NOT allow children to operate the radio.
BATTERY CARE SST-4425CHARGINGThe handheld is powered by a rechargeable battery,which fits into the radio case (see FIG-1).The battery pack can lose its charge during storageand shipment, and should be fully charged before theradio is used. Thereafter, the battery should becharged overnight after each day of use, to ensurepeak radio performance for the next day. Using thecube charger (model BC-A), the battery shouldcharge completely in 12 hours.To charge the battery using a RITRON cube charger -plug the charger cord into the smaller of the two jackson top of the radio. Then plug the cube into a 110VAC outlet. The green lamp lights while the battery ischarging, and should go off only when the cube isunplugged.Two charger contacts, visible through the bottom ofthe radio case, allow the battery to be charged usingan optional RITRON drop-in charger (model BCC-PS). The battery pack may be charged inside oroutside of the radio case.To charge the battery using a drop-in charger (modelBCC-PS) - plug the drop-in charger into a 110 VACoutlet. Set the portable or battery into the charger.Each battery contact must rest on a charger contactpin.NOTE: A new battery must be cycled (charged anddischarged) several times before it will reachits maximum charge capacity.PRECAUTIONS• Use only RITRON-supplied chargers; otherchargers might cause fire, explosion, or otherdamage to the radio.• Do not "fast-charge" a brand new battery pack.Otherwise, the battery might be damaged.• Once the battery has been charged fully usingthe normal rate, the fast rate may be usedthereafter.• Do not fast-charge a battery pack that is fullycharged. This can shorten battery life.• Do not charge or replace a battery in anexplosive atmosphere. Contact sparking canignite an explosion.• Do not dispose of a battery in fire. An explosionmight result.• Do not charge the battery in temperatures colderthan about 45°F. Electrolyte leakage can occurand ruin the battery.• Charging in temperatures above approximately95°F will not harm the battery, but can reduce itscharge capacity.BATTERY REPLACEMENTTo replace the battery in the SST-442:1. Hold the radio as shown in FIG-1(A)2. Use your thumbnail to open the Door Latch, asshown in FIG-1(A).3. Lift and rotate the Battery Access Door to releaseit as shown in FIG-1(B).4. Use the Pull-tab to pull the Battery Pack out ofthe case as shown in FIG-1(C).5. Insert the replacement Battery Pack as shown inFIG-1(C). Push the Battery in as far as possible.6. Replace the Battery Access Door. Secure it byclosing the Door Latch as shown in FIG-1(A).7. Be certain to firmly lock the Door Latch, asshown in FIG-1(A).BATTERYACCESSDOORPULL-TABFIG-1: Battery Replacement(A)(B)(C)LATCHCLOSEDLATCHOPENBATTERYACCESSDOOR
BATTERY CARE SST-4426BATTERY MAINTENANCEWith daily use and recharging, a battery’s service lifeis about one year. To ensure maximum service life,follow these guidelines:•DO NOT discharge a battery that is already “rundown.” If the battery cannot power your radio,recharge the battery.•DO NOT overcharge a battery. The standardbattery should not be left to charge continuously.•Condition battery packs once a month asdirected in Battery Conditioning.•Condition batteries that are run down.•Charge batteries for 16 hours before storage,and for 16 hours once a month thereafter.•DO NOT charge batteries in temperatures colderthan about 45°F. Charging batteries intemperatures above 95°C. does not harm them,but can reduce charge capacity.It is time to purchase a new battery:•When the radio’s transmitter coverage decreasesor does not work at all.•When the radio quits working after just a fewhours of use, even with a full overnight charge.•When the battery is more than two years old.The date of manufacture is stamped on everybattery. The first two digits indicate the year, thelast two digits the week.BATTERY CONDITIONINGDue to the extended run time of the SST-442 radio,some users may never fully discharge the batterypack during normal use. Achieve maximum batterylife by fully discharging the battery periodically tocondition it.After exposing the battery pack to many cycles of notfully discharging it before recharging, the radio mayexhibit reduced battery capacity. This reducedcapacity is evident when, after several hours of use,battery voltage drops while the radio is transmitting,causing the radio to emit a dead battery warning toneand shut itself off.Condition battery packs by the following procedure aseither a preventive measure, or if you suspectreduced capacity:1. Use your radio throughout a normal working daywithout charging.2. Press and hold the On/ Volume Up and VolumeDown/ Off buttons simultaneously for 8 secondsto place the radio in "open squelch" mode.3. Release both buttons when you hear the radiobeep rapidly; it will then emit a loud "rushing"noise. Press On/ Volume Up to maximize thisnoise.4. Put the radio away in a secure place (possibly adesk drawer), where nothing can press againstthe buttons to accidentally turn it off or cause it totransmit. Allow the radio to run until it shuts offwhen the battery is completely discharged. Atypical battery pack may require up to 8 hours tocompletely discharge.5. When the radio has shut off, charge it overnightfor 12-14 hours. The battery will be ready for usewith renewed capacity.
OPERATION SST-4427CHON OFF/HOLDVOLUMEAntennaVol Down/OffOn/Vol UpAudioAccessoryJackJack CoverCharge JackSpeakerMicrophonePush-to-TalkChannelSelectorBattery AccessDoor(Case bottom) Battery ChargerContacts(Case bottom)Fig. 2 Controls and Accessory ConnectorsDESCRIPTION OF CONTROLS ANDCONNECTORSAntennaThe flexible antenna radiates and receives radiosignals. Before using the radio, be sure theantenna base is threaded fully into the radio’santenna bushing.Use only the antenna(s) available from RITRONfor the SST-442. Do not attempt to substitutewith any other antenna.On/Volume UpThis button switches on the radio, then increasesthe volume if you continue to press.Volume Down/OffThis button decreases the volume, then shuts offthe radio if you continue to press.Push-To-TalkThe PTT activates the transmitter, and must beheld down while you talk into the microphone.Release the PTT button to receive.Channel SelectorPressing this button selects the next channel.When the maximum number of channels isreached and you press this button, the radioresets to channel 1.Audio Accessory JackThis jack connects speaker audio to optionalaccessories, such as a remote speaker/microphone or an earphone. For accessoriesthat have a two-plug connector, the smaller plugis inserted into the charge jack.This jack is also used to program the radio usingthe optional PC programming kit.Charge JackThe battery may be charged through this jackusing a standard RITRON wall socket chargercube. This jack also connects microphone audioto the optional remote speaker/microphone.MicrophoneThe microphone converts your voice intoelectrical impulses, which are carried with yourbroadcast to receiving radios. Hold the radioabout four inches away and talk into themicrophone while transmitting. Shouting doesnot improve the listener’s reception.SpeakerThe speaker allows you to hear calls on yourchannel.Jack CoverThis rubber cover seals out dust and moisture, etc. Snap thecover into the audio accessory and charge jack openingswhen the jacks are not being used.Battery Access (Case Bottom)The battery door on the case bottom may be removed toaccess the battery. (Refer to the Battery Replacement sectionof this manual.)Drop-in Charger Contacts (Case Bottom)Two charger contacts in the bottom of the SST-442 radio caseallow the battery pack to be charged using an optionalRITRON drop-in charger (model BCC-PS.)
OPERATION SST-4428RADIO OPERATIONOn-off/VolumeTo switch on the radio - press the On/Volume Upbutton. The radio will beep a number of times equalto the current channel number.To adjust the volume - press the volume up buttonuntil you reach the desired level. You should hearnoise and any broadcasts on the channel.To turn off the radio - press and hold the Off/VolumeDown button until two tones sound.To determine whether the radio is on - press thevolume down button. If the radio is on, noise oractivity on the channel is heard.ReceiveTo hear calls from other users - adjust the volume asdesired. The radio can receive broadcasts while thePush-To-Talk button is not being pressed. Whetheror not you hear these broadcasts depends upon thesquelch settings.There are two types of squelch used in the SST-442portable. First is carrier squelch. This lets you hearall broadcasts on your channel strong enough for theradio to detect, and silences noise. Second is one ofthe selective signaling or “tone squelch” formatsavailable on the SST-442. This allows you to screenout “on-channel” broadcasts that do not carry thecorrect code programmed for the radio.Note: It is possible that the beginning of a call mightbe missed while the radio is in battery savermode. If this happens, ask the caller to repeatthe message.Selective Signaling SquelchTo activate tone squelch - simultaneously press bothof the volume buttons. Hold for a second or twobefore releasing. When tone squelch is turned on,the handheld sounds one beep. When carriersquelch is on, the radio emits a "double beep."Note: If you continue to hold down the volumebuttons after the beep (or double beep), theradio will start beeping repeatedly. Thismeans that squelch is turned off. Release thebuttons. To restore squelch, press and holdboth of the volume buttons until the radiosounds a beep or double beep.MonitorTo monitor the channel - press one of the volumecontrol buttons. When you press the volume up orthe volume down button, squelch turns off and allradio traffic on the channel (and noise) sounds in thespeaker.Battery SaverThe handheld has a programmable "battery saver"feature that conserves battery power. The batterysaver constantly checks the radio's transmitter,receiver and controls for activity. If a number ofseconds pass without the receiver detecting a call,and without the user operating a control, this featureremoves power from most of the radio.During this "off-time," any activity restores full power.Every few fractions of a second, the battery saverapplies power to the receiver, checking forbroadcasts. It is possible that the first part of anincoming call might go unheard before activity isdetected and power restored. If this happens, thecaller can repeat his message. Once "radio contact"is made, normal unhurried conversation can follow.TransmitNormally, you should not transmit until no one istalking on the channel.To transmit - hold down the Push-To-Talk button andwith the radio four inches away talk into themicrophone. Speak in a normal tone, since talkinglouder will not improve the listener’s reception.Channel SelectionTo change channels - press and release the Channelbutton. The radio will beep a number of times equalto the current channel number. Pressing the Channelbutton again will increment the channel and the radiowill beep the new channel number. For example, ifyou select channel 2, the handheld will beep twice. Ifthe highest channel number is selected and youpress the Channel button, the radio will reset tochannel 1. A one-channel radio will beep only oncewhen you press the Channel button.
OPERATION SST-4429WHAT THE RADIO TONES MEANThe handheld responds to certain instructions bysounding a beep or series of tones. These tones cantell you whether the radio is working as you expect.Power On/Self Check “OK”When it is first turned on, the radio runs a quick “selftest” to confirm basic functions. The radio then beepsthe number of times equal to the channel numberselected. The radio is then ready to use.Error TonesHowever, if the “self test” detects a diagnostic error,an error tone sounds. Alternating tones (the secondis longer and lower pitched) indicate the radiofrequency synthesizer is malfunctioning. Turn off theradio and try again. A long, low-pitched tone meansthe battery voltage is too low to operate the radio. Inthis case, recharge the battery. If you cannot correcta problem, consult an authorized Ritron servicefacility or Ritron.Channel SelectWhen the Channel button is pressed, the radio beepsa number of times equal to the current channelnumber. Pressing the Channel button again willincrement the channel and the radio will beep thenew channel number.Tone SquelchWhen you press and hold both Volume buttons at thesame time, a single beep will sound to indicate thattone squelch is on. A "double beep" means thatcarrier squelch is on.Recharge Battery AlertAs the battery voltage approaches the minimumrequired “operating voltage” the radio will emit a shortbeep every minute to alert the user that the batterywill soon need recharging. Once the battery chargedrops below the required "operating voltage," theradio emits a long, low tone and turns itself off. If youturn the radio back on, it will beep again and shutitself off. Recharge the battery.OPTIONAL RADIO TONESThe SST-442 can be programmed using the RITRONPC Programmer for optional alert tones.Receive Squelch ToneA short tone sounds at the end of each receivedtransmission to indicate that you may transmit.Busy Channel Transmit InhibitIf a user is transmitting on your radio frequencywithout your tone, you will not be allowed to transmit.The radio will beep a series of long, low tones whilethe PTT is held down (like a busy signal).Transmitter Time OutA low tone followed by a higher-pitched tone soundsand the transmitter automatically shuts off if you holddown the PTT button longer than the programmedTime-out. The radio automatically switches to receivemode. Authorized service personnel can turn off thisfeature.BELT CLIP INSTALLATIONIf you are going to attach the belt clip to the handheld,follow these instructions:1. The belt clip is fastened to the radio case backwith the Philips head screw provided. Use thescrew included, since a longer screw mightdamage the radio’s electronics.Do not use petroleum solvents of any kind on theradio. These can corrode the case.2. Place the belt clip on top of the radio case back,with the screw hole in the aligned with the hole inthe radio case.3. Using the screw that came with this accessory,attach the clip to the radio.
OPERATION SST-44210TROUBLESHOOTINGIf you have trouble operating the handheld, review theradio controls and operation sections. If you think theradio is malfunctioning, check the following table.GENERAL The radio does not work at all.• Make sure the battery is installed correctly, asshown in FIG-1.• Recharge or replace the battery. (See note 1.)Operating features do not work exactly as expected.• The radio has been factory or dealerprogrammed for customized operation.Reception is poor.• Move to a different location. (Note 2.)• Confirm that the proper antenna is connected tothe radio. (See p. 11, "Antenna.")You cannot hear calls from other radios.• Turn off tone squelch. (See Note 3.)• Be certain your radio receives on the same asthe caller transmits. (Note 4.)• Recharge the battery. (Note 1.)Your calls cannot be heard in other radios.• Make sure that your radio transmits on thereceive frequency of the radio(s) you want to call.(Note 4.)• Recharge the battery. (Note 1.)TONE CODED SQUELCH You cannot screen out calls from users outside ofyour tone group.• Make sure the channel is programmed with tonesquelch.• Activate Tone (coded) squelch. (Note 7.)You cannot hear Tone coded messages while inTone (coded) squelch.• Confirm that the channel is programmed todetect the same code as the calling radio(s)transmits. (Note 7.)Others in your tone group cannot hear your tonecoded messages.• Verify that you transmit the same code as theradio(s) you call are programmed to detect.(Note 7.)ERROR TONES An error tone sounds when the radio is firstturned on.• Replace the battery. (Note 1.)• See "Error Tones" in the Operation section.An error tone sounds while you are talking. (andthe transmitter shuts off).• Refer to “Error Tones”BATTERY The battery loses its charge sooner thanexpected.• Review the battery charging instructions.• Conserve the battery. (Note 5.)• If the radio is used in extreme cold, warm theradio under your coat. (Note 6.)Notes1. Try a battery pack from a working radio. If the radio inquestion works with that pack, the original battery issuspect. Charge the suspect battery as recommendedin this manual. Then, if the charged original batterycannot power the handheld, try charging again withanother charger. If the battery still doesn’t hold acharge, the pack should probably be replaced.However, if the battery appears to be good after you trythe second charger, the first charger might be faulty. Ifyou think that an accessory is not operating properly,contact your dealer or RITRON. (Radio accessoriescome with a 90-day limited warranty.)2. Reception can often be improved by moving a shortdistance. This effect is more noticeable inside ofbuildings. The range of these portables equipped witha standard battery pack is about two miles (line-of-sight).3. If your radio does not detect calls from other radios onthe channel, turn off tone squelch. (Press both Volumebuttons at the same time - a double beep means thattone squelch is off.)4. If you want to hear a call, you must select a channelthat is programmed to receive the caller’s transmitfrequency. If you want to call another unit, you mustselect a channel that is programmed to transmit theother radio’s receive frequency. However, if you use arepeater, your channel must be programmed to workwith the repeater’s transmit and receive frequencies.(A radio channel can hold two separate operatingfrequencies, one for Receive, the other for Transmit.)5. Maximum power drain occurs while the radio transmits,so don’t hold down the Push-To-Talk button more thannecessary. Battery power is used while the handheld isleft on to receive calls. If practical, switch off the unit.6. In extreme cold, a battery’s charge capacity is greatlyreduced. If you use the radio in very cold weather,periodically warm the portable underneath your coat ifpossible. An optional remote speaker/microphonewould allow you to keep the radio under your coat whiletransmitting and receiving.7. In order for radios to communicate using Quiet Call,they must be programmed with the same tone code.Each code is unique, and your radio will respond onlyto the code programmed. Press and hold both volumebuttons at the same time. A single beep means thattone squelch is on. A double beep means that tonesquelch is off.
PROGRAMMING THE RADIO SST-44211PROGRAMMING METHODSEach SST-442 can be programmed to operate on upto 10 channels. The SST-442 may be programmedusing the Push-to-Talk switch or an optional RITRONPC programming kit.PTT (PUSH-TO-TALK) PROGRAMMING allows youto program any channel to one of the radiofrequencies listed in Table 1 and any Quiet Call codelisted in Table 2. The radio will transmit and receiveon the programmed table frequency and QC code.PC PROGRAMMING allows you to program anyfrequency within the band and channel spacing of theradio model. This method also lets you customize thehandheld with optional operating features.PTT (PUSH-TO-TALK) PROGRAMMINGNote: If the radio will not enter PTT program mode,this feature has probably been turned off using theoptional PC programming kit.Reading Out a Radio Channel’s Contents1. Place the radio in Program / Readout mode asdescribed in Fig-3.2. Press the Channel Selector button to select theradio channel you would like to read out.3. Press and release the Volume Up button.4. The radio will emit a series of beeps, pause, andthen begin another series. Four series of beepswill be heard, with each series representing adigit. The number of beeps in a series is equalto the digit. (See CHANNEL READOUT)5. Write down each digit while the radio pauses.List the digits in the order that you hear them.6. The first two digits represent the frequency asshown in Frequency Table 1 on page 13.7. The second two digits represent the QC(CTCSS) tone frequency as shown in Quiet-CallTone Code Table 2 on page 13.8. To read out another channel, follow steps 2through 7.9. Turn the radio off to exit Channel Readout mode.Notes:1. Ten (10) beeps = the digit zero (0)2. The radio will beep out “44” as a tone code if ithas been programmed for “No Tone”.3. A radio that has been PC-programmed with anyfrequency not listed in Frequency Table 1, page13, will emit the error tone on content readout.Fig. 3 PLACING THE RADIO IN PTTPROGRAM / READOUT MODE CHANNEL READOUT:FREQUENCY CODE# of beepsin series1st digit ∗ 2nd digit ∗# of beepsin seriesTONE CODE# of beepsin series3rd digit ∗ 4th digit ♦# of beepsin seriesNotes:∗Pause after entering each digit. The radiowill emit a low tone, separating one digitfrom the next.♦ The radio sounds a triple beep when PTTchannel programming is complete.
PROGRAMMING THE RADIO SST-44212PTT Programming a Radio ChannelFour valid digits must be entered for the radio toaccept PTT programming. The first two digits enteredare the frequency code from Table 1, followed by thetwo digits for the QC code from Table 2.1. Place the radio in Program / Readout mode asdescribed in Fig-3 on page 11.2. Press the Channel Selector button to select theradio channel you would like to program.3. Enter the first digit by pressing the PTT buttonthe number of times equal to the digit’s value.4. Pause after the digit is entered, a low tone willsound indicating that the digit has beenaccepted.5. Enter the second, third and fourth digits using thesame method as the first digit.6. Press the Volume Up button to enter the newchannel programming. The radio will emit a triplebeep confirmation tone to indicate thatprogramming has been accepted.7. To program another channel, follow steps 2through 6.8. Turn the radio off and then on again – the radiois now ready for use.Notes:1. To enter the digit zero ( 0 ), press the PTT tentimes.2. Program “44” to enter “No Code” for Quiet Call.You must enter “44” to match radios not havingtone codes.3. An error tone will sound if you attempt to save anincorrect digit. Turn the radio off, check thedigits you are attempting to enter, then start overagain.4. If you make a PTT click error, turn the radio offthen on, and start over.5. If the radio does not emit a confirming triple tonewhen you attempt to enter Program / Readoutmode, the radio was dealer customized todisable PTT programming.6. Refer to the Frequency Table 1 and Tone Code(Quiet Call) Table 2 on page 13.Return to Normal OperationAfter you finish programming, turn the radio off andthen on again. The radio will beep when it is ready fornormal operation.PTT Programming MistakesInvalid Entries An error tone means thatyou tried to save an invalid entry. No programmingchanges are made in this case. A triple tone willsound next indicating that the radio is still inprogramming mode, and ready for an entry.PTT Entry Mistakes If you press the PTT fivetimes when you intended four, for example, or if youjust lose count, do not press the Volume Up button tostore the entry. Instead, start over by turning theradio off and placing the radio in programming modeagain. PTT CHANNEL PROGRAMMING:FREQUENCY CODE# of beepsin series1st digit ∗ 2nd digit ∗# of beepsin seriesTONE CODE# of beepsin series3rd digit ∗ 4th digit ♦# of beepsin seriesNotes:∗Pause after entering each digit. The radiowill emit a low tone, separating one digit fromthe next.♦ The radio sounds a triple beep when PTTchannel programming is complete.
PROGRAMMING THE RADIO SST-44213Code Frequency Description01 467.7625 J02 467.8125 K03 464.5500 Yellow Dot04 464.5000 Brown Dot05 467.8500 Silver Star06 467.8750 Gold Star07 467.9000 Red Star08 467.9250 Blue Star09 469.262510 462.5750 White Dot11 462.6250 Black Dot12 462.6750 Orange DotTable 1 – PTT Programming Frequency TableQC Freq QC FreqCode (Hz) Code (Hz)01 67.0 27 167.902 71.9 28 173.803 74.4 29 179.904 77.0 30 186.205 79.7 31 192.806 82.5 32 203.507 85.4 33 210.708 88.5 34 218.109 91.5 35 225.710 94.8 36 233.611 97.4 37 241.812 100.0 38 250.313 103.5 39 69.414 107.2 40 159.815 110.9 41 165.516 114.8 42 171.317 118.8 43 177.318 123.0 44 No Tone19 127.3 45 183.520 131.8 46 189.921 136.5 47 196.622 141.3 48 199.523 146.2 49 206.524 151.4 50 229.125 156.7 51 254.126 162.2Table 2 – Quiet Call Codes and Frequencies1) Ritron Transceiver programming software, whichis contained on 3.5" diskettes.2) Installation instructions and a registration form.3) Ritron PC to radio adapter cable, which isterminated at one end with a DB-25F connector,at the other end with a modular plug. The DB-25plugs into the computer’s serial port, the modularplug into the SST-SRVBD modular jack.4) An adapter for use with SST-442 portables. Thisadapter mates the modular plug to a 3.5 mmplug, for connection to the handheld audio jack.The PC Programming Kit Requires:A PC compatible computer with Windows 95 or later.The computer must have an RS-232 serial port and aminimum of 2MB available on the hard disk drive forinstallation. COMPUTER SOFTWARE COPYRIGHTSThe RITRON, Inc. products described in this manualinclude copyrighted RITRON, inc. computerprograms. Laws in the United States and othercountries grant to RITRON, inc. certain exclusiverights in its copyrighted computer programs, includingthe exclusive right to distribute copies of theprograms, make reproductions of the programs, andprepare derivative works based on the programs.Accordingly, any computer programs contained inRITRON, inc. products may not be copied orreproduced in any manner without the express writtenpermission of RITRON. The purchase of RITRON, inc. products does notgrant any license or rights under the copyrights orother intellectual property of RITRON, inc., except forthe non-exclusive, royalty fee license to use thatarises in the sale of a product, or as addressed in awritten agreement between RITRON, inc. and thepurchaser of RITRON, inc. products.PC COMPUTER PROGRAMMINGRITRON’s programming kit allows programming ofthe SST-442 model radios using a PC compatiblecomputer. An adapter cable connects the radio to acomputer’s serial communications port. Once thecable is hooked up, the user inserts the disketteprovided into his computer’s floppy disk drive andloads a software program.This program transfers data between radio andcomputer memory, and includes on-screeninstructions and help. Radio data may be saved tothe computer’s hard disk in order to program otherradios.The PC Programming Kit Includes:
PROGRAMMING THE RADIO SST-44214Programmable FeaturesThe following features may be programmed on a perchannel basis, or will affect all channels together.Factory PerFeature Range Setting ChannelAutomatic Inactivity Y - N Y -Turn-offBattery Saver Enable Y - N Y -Battery Saver Off Time 0 – 8 1 -(seconds)Beep Volume Level F-C C -(Fixed or Controlled)Beep Fixed Level 0 – 100% 50% -(percent of full volume)Busy Channel TX Inhibit Y - N N √Carrier Only, No Codes - - √Channel Beep Rate S – F S -(Slow or Fast)Channel Selection Mode I – E I -(Increment or Enter)Digital Tone Invert RX Y - N N √Digital Tone Invert TX Y - N N √Digital Quiet Call (DCS) - - √Disable Monitor Y - N N √Number of Channels 0 – 10 4 -Narrow Band Channel Y - N N √PTT Programming Y – N Y -EnabledQuiet Call (CTCSS) See Table 2 - √Receive Squelch Tone Y - N N √Squelch Tightener 0 - 7 0 √TX Time-out Enabled Y – N Y -TX Time-out Timer 0 – 255 60 -(seconds)Turn On To Medium Y - N Y -Volume LevelDescriptions of FeaturesAutomatic Inactivity Turn-off - The radio automaticallyshuts itself off if four hours go by without the micro-controller detecting input from the volume, PTT orchannel controls.Battery Saver - Enabling this option allows the radioto go into battery saver mode when the radio remainsidle. The power saver begins after eight seconds ofinactivity.Battery Saver Off Time - This is the cycle time thatthe radio is off in battery saver mode before it checksfor a received signal. A long Battery Saver Off Timemay cause the user to miss the beginning of the firstmessage when in battery saver mode.Beep Volume Level - The radio can be programmedfor a fixed beep volume or for a beep volume that isadjusted with the Volume controls. If fixed beepvolume is selected, the fixed level can be set between0 – 100%.Busy Channel Transmit Inhibit - This keeps the radiofrom broadcasting if the channel is busy, and is oftenused in conjunction with Disable Monitor. If you pressthe PTT when the channel is busy with a signal notintended for your radio (not carrying your tone code),this feature sounds a "busy" tone in the speaker andkeeps the transmitter turned off.Channel Beep Rate - The rate at which the channelindicator beeps occur can be set to fast or slow.Channel Selection Mode - This feature allows thechannel selector to increment or enter the channel.The channel number is "beeped out" when thechannel button is first pressed. The channel is notchanged. In increment mode the radio is changed tothe next available channel if the channel button ispressed again within three seconds. In enter modethe user must press the channel button the number oftimes equal to the channel they wish to select.Digital Quiet Call RX Invert - The programmed codeis inverted for receive mode only.Digital Quiet Call TX Invert - The code is inverted fortransmit mode.Disable Monitor - This function may be programmedto keep the radio user from listening to otherlicensees on a shared channel. QC or DQC must beused for this option to have any affect, and theEncode Only feature disabled.Maximum Number of Channels - The number ofchannels available on the radio can be set from 1 to10.Narrow Band Channel - Any channel can be set tooperate in narrow band mode, reducing the transmitdeviation to 2.5 KHz.PTT Programming Mode Enabled - This featureallows channel programming from a table of pre-determined frequencies using the radio PTT switch.
PROGRAMMING THE RADIO SST-44215 Quiet Call (CTCSS) - Programming a Quiet Call codeallows you to screen out transmissions that do notcarry your code. Your code is broadcast when youpress the PTT to make a call.Quiet Call Encode Only - The Quiet Call codeprogrammed for the channel is transmitted with yourcalls. However, no Quiet Call code is programmedfor receive mode, allowing all traffic on the channel tobe heard.Receive Frequency - The radio frequency thatreceives broadcasts from other units.Receive Squelch Tone - The receiving radio beeps atthe end of each received transmission.Squelch Tightener - This feature reduces distant "co-channel" or other interference for channels that arenot programmed with Quiet Call. Carrier squelch isset for maximum sensitivity at the factory, but may beadjusted to mute weak signalsTransmit Frequency - The radio frequency thatbroadcasts to other units.Transmit Time Out Timer - This feature automaticallyshuts off the transmitter (ending your call) if you holddown the PTT button continuously for 60 seconds.The radio sounds a tone when the transmitter shutsoff.Turn On To Medium Volume Level - The volume levelis at mid-range when the radio is first turned on.Normally, the volume level is low when the radio isturned on.
THEORY OF OPERATION SST-44216INTRODUCTIONThe SST-442 is a four-channel handheld transceiverbuilt on a single multi-layer printed circuit board. Bothsides of the main printed circuit board are populatedwith components, with the bottom side containingonly surface mounted components.The SST-442 is frequency synthesized, with allfunctions of the radio controlled by microcontroller.POWER SUPPLY AND VOLTAGE DISTRIBUTIONThe SST-442 is powered by an internal 6-cellrechargeable battery pack. The battery pack suppliespower to the radio via two contact terminals that areconnected to the PCB through P302. F301 is a 3Afuse in series with P302 for short circuit protection.The battery pack may be charged through 2.5 mmcharge jack J301 via CR302 and F301. Zener diodeCR301 prevents the batteries from dischargingthrough the charger accessory, stops a reversevoltage from being applied to the battery packthrough J301, and prevents a high voltage from beingapplied to the radio circuitry.SW301 ON/VOL UP switch is pressed to turn on theSST-442, turning on voltage pass transistor Q304 viaR302 and CR303. Q304 supplies power to IC309, a+5 VDC regulator used to power microcontrollerIC301. Pin 13 of IC301 turns on Q303, which keepsQ304 turned on after SW301 has been released.Power is removed from the SST-442 by pressing theVOL DN/OFF switch SW302 until a beep is heardfrom the speaker, at which time Q304 is turned off.+5 VDC regulator IC309 supplies power directly tomicrocontroller IC301, bilateral audio gates IC304,reference oscillator Y302, synthesizer IC401, andPTT detect transistor Q302.The T/R output at Pin 11 of IC301 lets Q101 switchthe regulated +5 VDC to the receiver. Pin 11 ofIC301 will also turn on Q202, which turns on voltagepass transistor Q204. With Q204 emitter connectedto the +VBATT battery supply, the collector output isconnected to the emitter of Q202 through voltagedivider R202/R203, whose values are selected to limitthe TX+V voltage to +6 VDC.Power StrobeThe SST-442 handheld includes a power strobefeature, which reduces battery current drain byperiodically removing voltage from part of the radio.The strobe off cycle time is programmable using thePC Programming Kit. The +5V SW power strobeoutput at Pin 10 of IC301 controls Q306, whichswitches the regulated +5 VDC to the audioprocessing circuitry and the synthesizer circuitry.This includes IC303A 2.5 VDC (Vag) for bias onaudio processing circuitry, IC303C audio high passfilter, IC308 and IC305A audio low pass filter for sub-audible frequencies, IC305B audio limiting amplifier,IC306 digital potentiometers, IC303B audio summingnode amplifier, and IC303D audio low pass filter.Low Battery Voltage DetectionBattery voltage is measured at A/D input Pin 16 ofIC301 through voltage divider R303/R305. The radiowill emit a periodic beep if low battery voltage isdetected, and will turn the radio off if the batteryvoltage drops below +5.2 VDC. This is to protect themicrocontroller and its EE memory from corruptiondue to low supply voltage.REFERENCE OSCILLATORReference oscillator Y302 is a 1.5 ppm temperaturecontrolled, voltage controlled oscillator (TCVCXO)operating at 14.4 MHz. The Pin 4 output of theTCVCXO provides a reference for the frequencysynthesizer IC401 at Pin 20. IC401 is programmed toprovide an output at Pin 1 that is ¼ of the reference(3.6 MHz), which is applied as a reference oscillatorto Pin 27 of IC301 microcontroller. The Y302 pin 4output is also multiplied up to 43.2 MHz by Q105 andits associated circuitry to provide a receiver 2nd localoscillator signal.SYNTHESIZERThe SST-442 radio is built around a common phase-locked loop (PLL) that consists of a voltage-controlledoscillator (VCO) and a frequency synthesizer. ThePLL generates both the receiver 1st local oscillatorand transmitter carrier signals. Control signals frommicrocontroller IC301 and Reference oscillator Y302are routed to frequency synthesizer IC401 per thefollowing chart:Pin NumbersIC301 Y302 IC401Clock 12 - 18Data 5 - 19Latch 20 - 17LD 12 - 2T/R SW 11 - -REF IN - 4 20REF OUT 27 - 1+5 SW 10 - 12+5V 1, 15, 28 2 5, 14Q404, CR401, C414 and associated componentsprovide a filtered supply for the VCO oscillator andbuffer amplifiers.Prescaler Divider / Synthesizer ControllerIC401 contains both a prescaler and synthesizercontroller. The prescaler squares and divides theVCO output present at pin 11 by either 64 or 65,determined by a synthesizer controller logic signal.The exact number of times the prescaler is instructed
THEORY OF OPERATION SST-44217to change divisors is determined by the channelfrequency.IC401 contains a digital phase detector that works asfollows: when an operating channel is changed or thereceive/transmit mode switched, a new synthesizeroperating frequency is selected. MicrocontrollerIC301 clocks new data into IC401 internal buffer insynchronization with clock pulses. The channelinformation is stored in EE memory of IC302 and isloaded into RAM when the channel is selected.Once new data is loaded into the buffer, a singlepulse from IC301 appears at IC401 to instruct thesynthesizer controller to latch and execute the newdata. IC401 utilizes internal circuitry to determinewhether the present VCO output frequency is correctby comparing the phase and frequency of the VCOsignal at Pin 11 to the 14.4 MHz reference oscillatorat Pin 20. IC401 produces an output signal at Pin 6,a single-ended phase/frequency detector output,proportional to the phase difference between the twoinput signals.The loop filter C429, C427, R419, R420, R418, andC426 transform the Pin 6 output signal to a DCvoltage for application to the VCO tuning varactorCR402. The synthesizer system is “locked” when thephase and frequency of both the reference and thedivided VCO signal are the same.The maximum amount of current this output can sinkor source is determined by the value of R421 tied toPin 8 of IC401, with the output current programmableto 25, 50 or 100% of maximum.VCO / Buffer AmplifiersQ403, L401, CR402 and associated componentsform the VCO (Voltage Controlled Oscillator), aresonant circuit that oscillates at frequencies from416 MHz in receive (receive frequency - 43.65 MHz)to 470 MHz in transmit. Varying the voltage at CR402changes the varactor capacitance, which in turnalters the VCO output frequency.When in transmit mode a +5 VDC T/RSW signal isapplied to Q406, which turns on Q405 to draw currentthrough pin diode CR404 and L403. With CR404biased on, L402 is effectively shorted to ground,shifting the VCO frequency up 43.65 MHz.Q401 and Q402 are buffer amplifiers, with Q401feeding in the input of the synthesizer at Pin 11, thereceiver 1st local oscillator and the transmitter pre-amplifier.Oscillator ModulationWhen the SST-442 is in transmit, modulation balancecontrol IC306E passes TX audio through to the VCOmodulation input at R416. TX audio is applied tovaractor CR403 to modulate the VCO. TX audio isalso routed to the Pin 1 input of TCVCXO referenceoscillator Y302. Low frequency tones modulate thereference oscillator because the synthesizer is notable to track them.DIGITAL POTENTIOMETERSIC306 contains 6 digital potentiometers programmedby IC301, sharing the same clock and data outputsused by the synthesizer and a separate Digital PotLatch signal from Pin 8. The digital potentiometersare used in conjunction with IC303B, a summingnode amplifier used for modulating the VCO andreference oscillator. IC306A, B, D, E, and F can onlybe changed through serial programming, and canonly be performed by an authorized licensed RFtechnician.IC306A is connected through R352 to the Pin 6 inputof IC303B. IC306A adjusts the DC output of IC303Bto tune the reference oscillator frequency.IC306B is unused.Volume control IC306C applies the processed voiceband signals at IC303D to audio amplifier IC307when in receive mode. Depressing the ON/VOL UPswitch SW301 increases the setting of IC306C whileVOL DN/OFF switch SW302 decreases it.Transmitter tone deviation control IC306D applies theoutput of the selective signaling low-pass filter IC308to the Pin 6 input of IC303B through R350. IC306D iscompletely closed in receive mode.Transmitter modulation balance control IC306E isused to apply the Pin 7 output of IC303B to the VCOmodulation input. This will set the ratio of themodulating signal applied to the VCO and thereference oscillator. IC306E is completely closed inreceive mode.Transmitter voice deviation control IC306F appliesthe processed voice band signals at IC303D to thePin 6 input of IC303B through R349. IC306F iscompletely closed in receive mode.RECEIVERAs mentioned before, Q101 switches the regulated+5 VDC to the receiver. The +VRX receiver voltageis switched at the strobe duty cycle if programmed forpower strobe.RF AmplifierA received signal from the antenna passes through alow-pass filter (L207, C216, C217, L206, C101, andC202) to the receiver headend. L101 and theassociated capacitors form a bandpass filter ahead oflow-noise RF amplifier Q102. L101 and C103 providea notch at the image frequency, 87.3 MHz below thereceive frequency. The amplified RF signal is appliedto a 2-pole bandpass filter consisting of L103, L104,and associated capacitors. This circuit can be tunedfor any 10 MHz band between 450 and 470 MHz.
THEORY OF OPERATION SST-442181st MixerThe amplified received input signal is applied to thegate of FET mixer Q103. The 1st local oscillatorsignal from the synthesizer module is applied to thesource of Q103. L106, C117 and C118 tune the drainoutput of Q103 to 43.65 MHz and apply it to YF101, a43.65 MHz two-pole crystal filter. Q104 andassociated components amplify the 43.65 MHz IFsignal and apply it to the input of the 2nd mixer at Pin16 of IC101.FM Receiver SubsystemA multi-function integrated circuit, IC101 andassociated components for the FM-receiversubsystem. The subsystem performs the followingfunctions: 1) 2nd mixer, 2) 2nd IF amplifier, 3) FMdetector, and 4) noise amplifier.The Pin 4 output of 14.4 MHz reference oscillatorY302 is multiplied up to 43.2 MHz by Q105 andassociated components. This signal is applied to the2nd local oscillator input at Pin 1 of IC101. The 43.65MHz signal at Pin 16 and the 2nd local oscillator aremixed, with the resulting 450 KHz output signalappearing at Pin 3. This signal is filtered by a 450KHz 6-pole ceramic filter YF102 and applied to theinput of the limiting IF amplifier at Pin 5. IC101 Pin 6is the de-coupled input to the IF amplifier, Pin 7 thelimited IF output signal. An internal quadraturedetector, whose center frequency is determined by450 KHz quadrature coil T101, detects the FM IFsignal. One input of the quadrature detector isconnected internally to the IF signal at Pin 7, whilethe other input is the phase-shifted signal from T101at Pin 8.Demodulated audio appears at Pin 9, where a low-pass filter (R114, C130) removes spurious quadratureoutput prior to application to the voice/toneconditioning audio circuitry. Demodulated audio fromPin 9 is applied to the Pin 10 input of a noisefilter/amplifier consisting of R112, C123, C124, R110,R111 and R113. The Pin 11 output of the noiseamplifier is applied to a biased noise detector CR103,with the output connected to an A/D input of IC301 atPin 19. The SST-442 is serial programmed to set thesquelch threshold and hysteresis.Voice / Tone Conditioning in Receive ModeSST-442 audio conditioning filter circuits are sharedwith the transmitter. The same high-passfilter/amplifier (IC303C and associated components)used in receive voice band conditioning is used in thetransmit band. Similarly, the low-pass filter (IC308and associated components) used for selective signaltone decode filtering is also used for selective signalencoding. Altering circuit configuration with bilateralswitches IC304A, B and C permits the use of thesame audio filtering system for both transmit andreceive modes.After R114 and C130 remove the 450 KHz elementfrom the demodulated audio output at Pin 9 of IC101,C333 couples the audio signal to bilateral switchIC304C for subaudible tone detection and connectionto IC304A for voice band audio processing.Voice BandBilateral switch IC304A passes the received audiosignal to the input of IC303C, which along with itsassociated components for a high-pass filter/amplifiercircuit that attenuates audio signals below 300 Hz.The output of IC303C is applied to the input ofIC305B limiting amplifier. Bilateral switch IC304B isswitched in receive to insert C351 into the feedbackcircuit of IC305B, providing de-emphasis of thereceived audio signal. Bilateral switch IC304B alsoremoves R335 from the Pin 6 input to reduce the gainand prevent limiting.The output from IC305B is applied to the input ofIC303D, which along with its associated componentsform an 18dB/octave low-pass filter for frequenciesabove 3000 Hz.The output of IC303D is connected to IC306C volumecontrol prior to connection to audio amplifier IC307.The output of IC303D is also connected to IC306Fvoice deviation control, which is completely closed inreceive mode to prevent received signals frommodulating the VCO and reference oscillators.Audio frequency tones from Pin 24 of microcontrollerIC301 are applied to the Pin 6 input of IC305B toprovide the SST-442 alert tones.Sub-AudibleBilateral switch IC304C passes the received audiosignal to the input of IC305A, which amplifies thesignal and applies it to the Pin 2 input of IC308, a 5-pole low-pass filter that attenuates frequencies above250 Hz.The output at Pin 5 is applied to an A/D input ofIC301 at Pin 18 for tone decoding. An internal digitalsignal processing routine programmed intomicrocontroller IC301 is used to decode the correctselective signaling code. The output at Pin 5 ofIC308 is also connected to tone deviation controlIC306D, which is completely closed in receive modeto prevent received subaudible tone signals frommodulating the VCO and reference oscillators.Audio AmplifierReceive audio from volume control IC306C is appliedto the Pin 2 input IC307, a 1 Watt audio amplifier.C365 couples the Pin 5 output to the internal 8Ωspeaker SP301 via audio jack J303.Microcontroller IC301 Pin 22 switches DC power tothe audio amplifier by turning on Q07, which thenturns on pass transistor Q308 to apply battery voltageto Pin 6 of the audio amp. CR307 prevents aninadvertent DC voltage at J303 from damaging theaudio amplifier.
THEORY OF OPERATION SST-44219ANTENNA SWITCHING / LOW PASS FILTERA low-pass filter comprised of filter L203, C213,C214, L204, C217, L207, and C216 removesharmonics from the transmitter output before applyingthe RF signal to the antenna. Received signals passthrough the low-pass filter before entering thereceiver RF amplifier circuitry.Two PIN diodes (CR201, CR101) and associatedcomponents form the antenna switching circuit. Withthe SST-442 in receive mode, no voltage is applied tothe PIN diodes and they do not conduct. This reversebiases CR201 to prevent the transmitter amplifierfrom affecting the receiver tuning and removesCR101 from the receiver input. Incoming signalsfrom the antenna pass through the low-pass filter,then L206 and C102 to the receiver headend.When the SST-442 is switched into transmit mode,transmitter supply voltage is switched on by Q201and Q202 and applied to R207. Current flowsthrough R207, L205, CR201, L206 and then CR101to ground, forward biasing the PIN diodes. CR201passes transmitter RF power to the antenna whileCR101 shunts the receiver RF amplifier input toground. L206 provides sufficient impedance toisolate the transmitter power from the receiver RFamplifier.TRANSMITTERKeyingThe SST-442 transmitter is keyed when PTT switchSW304 is depressed. Electret condensermicrophone M301 is connected in series to groundwith the PTT switch, which when depressed drawscurrent through M301, SW304, CR304 and R307 toturn on pass transistor Q302. Q302 then turns onQ301 to pull the TX Key Pin 2 input of microcontrollerIC301 low. The microcontroller T/R output at Pin 11then goes high to turn on Q202, which turns on passtransistor Q201 to apply +6VDC to the transmitter asdescribed previously. The transmitter can also bekeyed through J301 with an audio accessory thatinserts a microphone and PTT switch in series toground, drawing current through CR304.+VTX SupplyWith the transmitter enabled as described above, the+VTX voltage from Q201 is applied to transmitter RFamplifiers Q203 and Q204. +VTX supply alsoforward biases the PIN switching diodes CR201 andCR101 as previously described. The transmitter RFfinal amplifier Q205 is powered by the battery supply.The Pin 11 T/R output of microcontroller IC301 canbe PC programmed to hold the transmitter on afterthe PTT switch has been released to allow tonerelated turn-off codes for squelch tail elimination.Power AmplifierQ203, Q204 and associated components amplify theVCO signal and apply it to the input of RF Finalamplifier transistor Q205. The collector output ofQ205 is matched to the antenna switching circuitryand applied to the antenna through the low-passfilter.Voice / Tone Conditioning in Transmit ModeSST-442 audio conditioning filter circuits are sharedwith the receiver. The same high-pass filter/amplifier(IC303C and associated components) used in receivevoice band conditioning is used in the transmittervoice band. Similarly, the low-pass filter (IC308 andassociated components) used for sub-audible tonedecode filtering is also used for tone encode. Alteringcircuit configuration with bilateral switches IC304A, Band C permits the use of the same audio filteringsystem for both transmit and receive modes.Voice BandM301 microphone audio is passes through CR304,C334 and is switched by IC304A to the input ofIC303C, which along with its associated componentsform a high-pass filter/amplifier circuit that attenuatesaudio signals below 300 Hz. The output of IC303C isapplied to the input of IC305B limiting amplifier.Bilateral switch IC304B switches R335 in parallel withR336, raising the gain of limiting amplifier IC305B forfull limiting of the transmitter voice audio. The outputof IC305B is applied to the input of IC303D, whichalong with its associated components form an 18dB/octave low-pass filter for frequencies above 3KHz. The output of IC303D is applied to voicedeviation control IC306F, which sets the level of theprocessed transmitter audio applied to summing nodeamplifier IC303B used to modulate the VCO andreference oscillator.Sub-AudibleMicrocontroller IC301 generates the sub-audibleselective signaling encode waveforms at Pin 21 andapplies them to the input of buffer amplifier IC305A.The output of IC305A is applied to the input of IC308,a 5-pole low-pass filter that attenuates frequenciesabove 250 Hz. C342 and C343 set the cornerfrequency of the low-pass filter, with C342 switched inby Pin 7 of IC301 to lower the corner frequency forlower tones. The output of IC308 is applied to tonedeviation control IC306D, which sets the level of thetransmitter sub-audible encode tones applied tosumming node amplifier IC303B used to modulatethe VCO and reference oscillator.
THEORY OF OPERATION SST-44220MICROCONTROLLERThe SST-442 handheld transceiver is electronicallycontrolled by IC301, an 8-bit microcontroller. IC301has four 8-bit A/D inputs for processing analogsignals.PIN DESCRIPTION1 RESET is connected to the SST-442 +5V to startthe radio in a known state on power up.2 TX KEY input is pulled LOW when either theinternal or external PTT switch is pressed toinitiate transmitter operation.3 AUDIO GATE ENABLE controls analog switchesIC304A and B to configure the shared audioprocessing circuitry for receive operation whenLOW, and for transmitter operation when HIGH.4 SERIAL DATA INPUT links the microcontroller tocommunications from an external data terminalvia J303 RING connection. This allowsprogramming of the SST-442 EEPROM memoryused to store channel frequency andconfiguration information.5 DATA output sends serial data to frequencysynthesizer IC401 to program frequencyinformation, IC302 EEPROM memory, and toIC306 to set the digital potentiometers.6 EECLOCK output sends serial data clock pulsesto EEPROM IC302 when reading or writing.7 LOW-PASS CUT-OFF output goes LOW to lowerthe cut-off frequency of IC308 when the radio ison a channel programmed for a CTCSS tonebelow 150 Hz. This output is in a tri-state OPENcondition for all other tones.8 DIGITAL POT LATCH sends a single positivepulse after data has been sent to IC306 to latchthe new data and change the digitalpotentiometers to the new programmed settings.9 LED output goes LOW when the radio is onchannel 1 and is HIGH for all other channels.10 +5V SW output goes HIGH at a programmableperiodic rate to remove the +5VSW supply fromvarious circuits in the radio, thus conservingbattery life. In normal transmit or receive modethis output is LOW.11 T/R SWITCH output is connected to theSynthesizer circuitry to shift the frequency of theVCO oscillator used in both transmit and receive.The output is HIGH in transmit and LOW inreceive. T/R output is also used to switch supplyvoltage to the transmit and receive circuits.12 CLOCK output sends serial data clock pulses tofrequency synthesizer IC401 and digitalpotentiometers IC306 when programming thesedevices.13 +V SW output is HIGH when the radio is turnedon, keeping pass transistor Q304 turned on viaQ303 to supply power to the radio.14 GROUND15 VREFH sets the upper reference level for the A/Dand is connected to the regulated +5 VDC.16 A/D input BATTERY is used to measure thebattery voltage for low and dead batterydetection. This input also serves as the ON/VOLUP input, and is pulled LOW when SW301 isdepressed to turn on the radio and raise thereceiver speaker audio level.17 A/D input VOL DN/OFF is pulled LOW whenSW302 is depressed to lower the receiverspeaker audio level and turn off the radio. Thisinput also serves as CHANNEL input, and goesto 2.5 VDC when channel selector switch SW303is pressed to change the radio to the nextprogrammed channel.18 A/D input TONE DECODE accepts the receivedQC (CTCSS) and DQC (DCS) waveforms aftersignal processing for decode analysis.19 A/D input RSSI is used to measure the outputvoltage of the noise filter for squelch detection.20 LATCH output goes LOW to allow serial data tofrequency synthesizer IC401 and goes HIGH tolatch the data, allowing the synthesizer toexecute the new frequency information.21 TONE ENCODE outputs generate the QC(CTCSS) and DQC (DCS) encode waveforms forsignal processing prior to modulating the VCO intransmit mode.22 AUDIO AMP ENABLE output goes HIGH to applypower to audio amp IC307 for receiver speakeraudio or radio alert tones.23 RX AUDIO GATE ENABLE switches IC304C forreceive operation when LOW, and for transmitteroperation when HIGH.24 BEEP output generate the radio alert tonesheard in the speaker.25 See Pin 427 REFERENCE OSCILLATOR INPUT has the 3.6MHz reference signal from the synthesizer.28 +5 VDC VDD supply voltage.
ALIGNMENT PROCEDURE SST-44221WARNING!An authorized RF service technician must performtest and alignment of the SST-442. Do not attemptservice of the SST-442 if not completely familiar withthe operation of frequency synthesized radiooperation. The SST-442 can operate in both NarrowBand (2.5 KHz deviation) and Wide Band (5 KHzdeviation) systems.RECOMMENDED TEST EQUIPMENT1) 0 to +15 VDC, 2A current-limited power supply2) RF Communications Test Set (to 470 MHz) with:- FM Deviation Meter- RF Wattmeter- Frequency Counter (to 470 MHz)- SINAD Measuring Device3) Oscilloscope (to 20 MHz)4) VTVM or DMM5) RITRON PC Programming Kit6) RITRON SST-SRVBD Test ModuleRADIO PREPARATION1) Make sure the radio battery is fully charged.2) Install the RITRON SST-SRVBD test assemblyand serial programming cable as follows:a) Remove the SST-442 antenna from theradio.b) Plug the SST-SRVBD into the 2.5 mm and3.5 mm jacks on top of the radio.c) Screw the SST-SRVBD antenna nut fullyinto the SST-442 antenna connector.d) Set the jumper on the SST-SRVBDassembly to the “UHF” position.e) Connect the serial programming cable fromthe PC computer (with the RITRON PCprogramming kit software installed) to theSST-SRVBD test assembly3) Connect the FM communications test set to theBNC connector on the SST-SRVBD testassembly.4) Turn on the radio to place it in operating mode.5) From the PC Programmer on-screen menu,select “Tune Radio” to display the Alignmentscreen.6) Set the RF Communications Test set to theAlignment Frequency indicated on the Alignmentscreen.7) Press the appropriate “Select” button on theAlignment screen to make the followingadjustments:SELECT AlignmentFrequency Transmit frequencyMod Bal Modulation balanceTone QC/DQC tone encode deviationwide and narrow bandVoice Voice deviation with no tonewide and narrow bandVoice deviation with tonewide and narrow band8) After you have completed alignment of the SST-442, turn the radio off. This will remove the testfrequencies and return to operation on thecustomer’s programmed frequencies.REFERENCE FREQUENCY1) Make sure the unit has been switched on and isat room temperature (approximately +25° C)2) Select “Frequency” from the PC Programmer“Alignment” screen.3) Set the RF communications test set to theAlignment Frequency on the Alignment screen.4) Press the “Tune” button on the Alignment screento activate the transmitter.5) Transmitter frequency error should be less than+/- 500 Hz.6) If frequency adjustment is required, press the leftarrow on the tuning bar to lower the frequency orthe right arrow to raise the frequency.7) Press the “Save” button to store the newalignment setting or “Cancel” to leave settingunchanged.
ALIGNMENT PROCEDURE SST-44222MODULATION BALANCETransmitter modulation balance has been set at thefactory and should not require adjustment.1) Select “Mod Bal” from the PC Programmer“Alignment” screen.2) Set the RF communications test set to theAlignment Frequency on the Alignment screen.3) Press the “Tune” button on the Alignment screento activate the transmitter.4) Check the de-modulated waveform for a 20 Hzsquare wave.5) If adjustment of the modulation balance isrequired, press the left arrow on the tuning bar toflatten the top of the waveform or the right arrowto reduce overshoot.6) Press the “Save” button to store the newalignment setting or “Cancel” to leave settingunchanged.TRANSMITTER TONE DEVIATIONTransmitter tone deviation has been set at the factoryand should not require adjustment.1) Select “Tone” from the PC Programmer“Alignment” screen.2) Set the RF communications test set to thetransmit frequency on the screen.3) Select either “Wide Band” or “Narrow Band” bypressing the desired option button.4) Press the “Tune” button on the Alignment screento activate the transmitter.5) If adjustment of the tone deviation is required,press the left arrow on the tuning bar to lowerdeviation or the right arrow to raise deviation.6) Press the “Save” button to store the newalignment setting or “Cancel” to leave settingunchanged.TRANSMITTER VOICE DEVIATIONTransmitter voice deviation has been set at thefactory and should not require adjustment.1) Select “Voice” from the PC Programmer“Alignment” screen.2) Set the RF communications test set to thetransmit frequency on the screen.3) Select “Voice Only - Wide Band“, “Voice Only -Narrow Band”, “Voice & Tone – Wide Band”, or“Voice & Tone – Narrow Band” by pressing thedesired option button.4) Press the “Tune” button on the Alignment screento activate the transmitter.5) If adjustment of the voice deviation is required,press the left arrow on the tuning bar to lowerdeviation or the right arrow to raise deviation.6) Press the “Save” button to store the newalignment setting or “Cancel” to leave settingunchanged.RECEIVER SENSITIVITY AND SQUELCHThe SST-442 receiver is factory tuned for a frequencyrange of 460 - 470 MHz. The SST-442 receiver isconfigured from the factory for Wide Band operation,with a Narrow Band Model available as an option.The SST-442 receiver bandwidth is configured on aper radio basis, it cannot be switched on a perchannel basis.The receiver may be tuned to any 10 MHz frequencyband between 450-470 MHz.1) Program the radio to a receive frequency in themiddle of the desired 10 MHz band.2) Set the RF communications test set generator toa frequency exactly 87.3 MHz below theprogrammed receive frequency at a RF level ofapproximately –40 dB. Modulate the RF signalwith a 1 KHz tone at 3 KHz deviation for wideband, 1.5 KHz deviation for low band.3) Connect an 8-Ohm speaker to the 3.5mm audiojack on the SST-SRVBD test assembly.4) Adjust L101 for the minimum received signal atthis image frequency.5) Set the RF Communications Test Set’s generatorto the programmed receive frequency at a RFlevel of –120 dB. Modulate the RF signal with a 1KHz tone at 3 KHz deviation for wide band, 1.5KHz deviation for low band.6) Adjust L103 and L104 for the best receiverSINAD as measured across the 8-Ohm speaker.7) Check receiver sensitivity at the lowest andhighest operating frequencies and make slightadjustment to L103 and L104 to balancebetween the two, if necessary.
ALIGNMENT PROCEDURE SST-44223RECEIVER NOISE SQUELCHThe noise squelch sensitivity is set at the factory for a12dB SINAD signal. Using the PC Programmer,squelch sensitivity can be adjusted on a per channelbasis by adjusting the “Squelch Tightener” number tobetween 0-7. The higher number will require astronger received signal to open squelch.1) Select “Channel” from the PC Programmer “Edit”menu on the main screen.2) Select the channel to be set and press “Edit”button.3) Set the RF communications test set to thetransmit frequency on the screen.4) Enter a Squelch Tightener number between 0-7.5) Press the “OK” button on the Channel Editscreen to return to the Channel List screen.6) Select any other channels to be set.7) Press the “OK” button on the Channel List screento return to the Main screen.8) Select “Program Radio” from the PCProgrammer “Radio” menu to save all settingchanges.SYNTHESIZERThe synthesizer is preset at the factory for operationbetween 460 and 470 MHz. There is no manualadjustment to center the control voltage, with alladjustment performed by the factory selection of fixedcapacitor C413. Do not attempt to adjust thesynthesizer control unless a key component in thesynthesizer has been replaced. Key components donot include the Y302 reference frequency TCVCXO orIC401 synthesizer IC. Synthesizer alignment errorscause poor operation at temperature extremes.Should adjustment of the VCO control voltage benecessary, the radio must first be disassembled andpowered up at 7.5 VDC. The following proceduredefines testing of the VCO control voltage:1) Select the channel that has the lowest receivefrequency.2) Connect a VTVM, DVM or oscilloscope to TestPoint 1 and measure the VCO control voltage.This voltage should be no less than 1.5 VDC.3) Select the channel that has the highest receivefrequency and measure Test Point 1. Thecontrol voltage should be no higher than 4.5VDC.4) a) If adjustment of the VCO control voltage isrequired, remove the synthesizer shield top.b) Replace C413 with a capacitor value thatallows VCO control voltages between 1.5and 4.5 VDC for the operating frequenciesdesired. Decreasing the value of C413 willraise the operating frequency of the VCOwhile increasing the value will lower the VCOfrequency.c) Replace the top of the synthesizer shield.
VOLTAGE CHART SST-44224Measurement ConditionsSupply voltage at 7.5 VDC, radio in operating mode,volume control at minimum, power strobe enabled,transmitter set for full power.IMPORTANT: Because the SST-442 portable isconstructed with grounding sub-planes, use a systemground in the same proximity as the circuit beingmeasured. All readings indicated as GND are truesystem ground.KEY: All measurements are in VDC unless indicatedotherwise.NC = No connectionGND = Ground* = Voltage is strobed inPower Saver mode→= See note in rightcolumnREF PIN TX RX SB DESCRIPTIONCR101 1 0.7 0.0 0.0 TX/RX switching2NCNCNC3 GND GND GNDCR102 1 GND GND GND Voltage clamp2 GND GND GND30.00.0*CR103 1 GND GND GND Noise detection20.0→*→ amplified receiver3 0.0 < 0.5 * noiseCR201 1 1.4 0.0 0.0 TX/RX switching2NCNCNC3 0.7 0.0 0.0CR301 C 7.5 7.5 7.5 Over voltage protectionA GND GND GNDCR302 C 7.5 7.5 7.5 Reverse voltageA 2.2 4.8 4.8 protectionCR303 1 6.8 6.8 6.8 Turn-on detection2 4.2 4.2 4.23 6.1 6.1 6.1CR304 1 2.0 4.7 4.7 PTT switching2 2.2 4.7 4.73 2.4 5.0 5.0CR305 1 GND GND GND Voltage clamp2 5.0 5.0 5.03 0.0 0.0 0.0CR306 1 2.4 2.4 2.4 Voltage clamp2NCNCNC3 2.4 2.4 2.4CR307 C 7.5 7.5 7.5 Reverse volt protectionA0.0→*→ RX audio amp outCR401 1 5.0 5.0 * Biasing24.84.8*3NCNCNCREF PIN TX RX SB DESCRIPTIONCR402 1 GND GND GND VCO tuning2NCNCNC3→→ *→ 1.5 – 4.5 VDCVCO tuning voltageCR403 1 GND GND GND VCO modulation2NCNCNC32.42.4*CR404 1 0.8 0.0 * TX/RX VCO switching2NCNCNC30.04.8*IC101 1 0.0 4.7 * RX FM-IF subsystem2NCNCNC30.03.8*40.04.7*50.03.8*60.03.8*70.03.8*80.04.7*90.02.0*10 0.0 0.6 *11 0.0 2.4 *12 0.0 0.0 *13 NC NC NC14 NC NC NC15 GND GND GND16 0.0 1.7 *IC301 1 5.0 5.0 5.0 Microcontroller20.05.05.035.00.00.040.00.00.050.00.00.060.00.00.070.00.00.080.00.00.09→→→ → 0.0 V on Channel 110 0.0 0.0 * else 5.0 VDC11 5.0 0.0 0.012 5.0 5.0 *13 5.0 5.0 5.014 GND GND GND15 5.0 5.0 5.016 4.2 4.2 4.217 5.0 5.0 5.018 2.4 2.4 *19 0.0 0.5 *20 5.0 5.0 5.021 →2.4 * → 0-5 VDC tone22 0.0 5.0 0.0 encode waveform23 0.0 0.0 0.024 NC NC NC25 0.0 0.0 0.026 NC NC NC27 →→→ → 3.6 MHz clock signal28 5.0 5.0 5.0 IC302 1 GND GND GND EEPROM2 GND GND GND3 GND GND GND4 GND GND GND50.00.00.060.00.00.07 GND GND GND85.05.05.0123SOT-23
VOLTAGE CHART SST-44225REF PIN TX RX SB DESCRIPTIONIC303 1 2.4 2.4 * Audio processing22.42.4*32.42.4*45.05.0*52.42.4*62.42.4*72.42.4*82.42.4*92.42.4*10 2.4 2.4 *11 GND GND GND12 2.4 2.4 *13 2.4 2.4 *14 2.4 2.4 *IC304 1 0.0 0.0 * Audio signal switching22.42.4*32.42.4*42.42.4*50.02.5*6 GND GND GND7 GND GND GND8 GND GND GND9 5.0 0.0 0.010 5.0 0.0 0.011 5.0 0.0 0.012 2.4 2.4 *13 NC NC NC14 0.0 2.4 *15 0.0 2.4 *16 5.0 5.0 5.0IC305 1 2.4 2.4 * Audio processing22.42.4*32.42.4*4 GND GND GND52.42.4*62.42.4*72.42.4*85.05.0* IC306 1 2.0 2.0 * Audio signal level2 NC NC NC control3 GND GND GND40.02.5*52.42.4*62.42.4*72.42.4*80.00.0*95.05.0*10 GND GND GND11 NC NC NC12 0.0 0.0 *13 2.4 2.4 *14 2.4 2.4 *15 2.4 2.4 *16 2.4 2.4 *17 2.4 2.4 *18 NC NC NC19 5.0 5.0 *20 5.0 5.0 *IC307 1 NC NC NC Audio amplifier2 0.0 0.0 0.03 GND GND GND4 GND GND GND5 0.0 3.7 0.06 0.0 7.5 0.07 0.0 3.7 0.08 NC NC NCREF PIN TX RX SB DESCRIPTIONIC308 1 2.4 2.4 * Tone low pass filter22.42.4*3 GND GND GND45.05.0*52.42.4*62.42.4*75.05.0*83.23.2*IC309 1 7.5 7.5 7.5 +5 VDC voltage2 GND GND GND regulator3 7.5 7.5 7.54NCNCNC55.05.05.0IC401 1 →→→ → 3.6 MHz clock signal2 5.0 5.0 * Frequency synthesizer3NCNCNC4NCNCNC55.05.05.06→→ *→ 1.5 – 4.5 VDC VCO7 GND GND GND tuning voltage82.22.2*9NCNCNC10 2.4 2.4 *11 2.4 2.4 *12 5.0 5.0 *13 NC NC NC14 5.0 5.0 5.015 0.0 0.0 *16 NC NC NC17 5.0 5.0 5.018 5.0 5.0 *19 0.0 0.0 *20 2.2 →2.2 →*→ 14.4 MHz referenceQ 101 1 5.0 4.3 * RX +V switching25.05.0*30.04.7*Q 102 1 0.0 0.7 * RX RF amplifier2 GND GND GND30.03.0*Q 103 1 0.0 4.7 * RX mixer20.00.0*30.01.8*Q 104 1 0.0 0.7 * RX IF amplifier2 GND GND GND30.01.2*Q 105 1 0.0 0.7 * RX 2nd LO2 GND GND GND multiplier/amp30.04.6*Q 201 1 6.8 7.5 7.5 TX +V switching27.57.57.537.00.00.0Q 202 1 5.0 0.0 0.0 TX +V switching24.30.00.036.87.57.5Q 203 1 0.7 0.0 0.0 TX RF amplifier2 GND GND GND35.60.00.0
VOLTAGE CHART SST-44226REF PIN TX RX SB DESCRIPTIONQ 204 1 0.2 0.0 0.0 TX RF driver amplifier2 GND GND GND3 7.0 0.0 0.0Q 205 1 GND GND GND TX RF Final amplifier2 0.0 0.0 0.03 7.5 7.5 7.5Q 301 1 5.0 0.0 0.0 PTT detection2 GND GND GND3 0.0 5.0 5.0Q 302 1 4.3 5.0 5.0 PTT detection2 5.0 5.0 5.03 5.0 0.0 0.0Q 303 1 5.0 5.0 5.0 Battery +V switching2 4.3 4.3 4.33 6.8 6.8 6.8Q 304 1 6.8 6.8 6.8 Battery +V switching2 7.5 7.5 7.53 7.5 7.5 7.5Q 306 1 4.3 4.3 5.0 +5V switching2 5.0 5.0 5.035.05.0*Q 307 1 0.0 5.0 0.0 Audio amplifier enable2 0.0 4.3 0.03 7.5 6.8 7.5Q 308 1 7.5 6.8 7.5 Audio amplifier +V2 7.5 7.5 7.5 switching3 0.0 7.5 0.0Q 401 1 0.7 0.7 * VCO buffer amplifier2 GND GND GND32.92.9*Q 402 1 0.7 0.7 * VCO buffer amplifier2 GND GND GND32.82.8*Q 403 1 2.3 2.3 * VCO oscillator21.61.6*34.34.3*Q 404 1 4.7 4.7 * VCO voltage2 4.3 4.3 * de-coupling35.05.0*Q 405 1 0.0 4.3 * TX/RX VCO switching24.34.3*34.20.0*Q 406 1 0.0 4.3 * TX/RX VCO switching2 GND GND GND34.30.0*
SCHEMATIC REFERENCE PARTS LIST SST-44227NOTE: This parts list reflects the most current component values. If a component value given in the schematicdiffers from this list, the parts list should be considered the most current.Last Update: May 11, 2001Ref Ritron PN Description X Y Theta LocCAPACITORSC101 151103A3 3.3pf NPO 0805 CHIP CAPACITOR 1065 3824 270 TopC102 151104A7 4.7PF 0805 50V CHIP CAP. 949 3929 180 TopC103 15110120 12PF NPO 0805 50V CHIP CAP 791 4059 90 TopC104 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 649 3620 180 TopC105 151106A8 6.8PF NPO 0805 50V CHIP 1016 3682 270 TopC106 15110180 18PF NPO 0805 50V CHIP 920 3790 180 TopC107 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 734 3620 180 TopC108 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 675 3519 90 TopC109 151106A8 6.8PF NPO 0805 50V CHIP 637 3994 270 TopC110 151103A3 3.3pf NPO 0805 CHIP CAPACITOR 557 3993 270 TopC111 151103A3 3.3pf NPO 0805 CHIP CAPACITOR 516 4099 180 TopC112 151103A3 3.3pf NPO 0805 CHIP CAPACITOR 382 4099 180 TopC113 15110100 10PF NPO 0805 50V CHIP CAP 476 3993 270 TopC114 151108A2 8.2PF NPO 0805 50V CHIP 275 4059 90 TopC115 15110150 15PF 0805 NPO 50V CHIP CAP 380 3786 0 TopC116 15182103 .01uF CAPACITOR, CHIP, 0402,Z5U,5/10/20 276 3382 180 TopC117 15110150 15PF 0805 NPO 50V CHIP CAP 199 3598 180 TopC118 15110470 47PF NPO 0805 50V CHIP 160 3491 90 TopC119 15181472 .0047uF CAPACITOR, CHIP, 0402, X7R,5/10% 485 3367 270 TopC120 151108A2 8.2PF NPO 0805 50V CHIP 407 3548 0 BottomC121 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 138 947 90 BottomC122 152B6106 10uF 10V 3.4 X 2.8 CHIP TANTALUM 451 1669 0 BottomC123 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 450 946 90 BottomC124 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 319 904 90 BottomC125 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 350 1364 0 BottomC126 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 441 1542 0 BottomC127 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 61 2203 0 BottomC128 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 217 2114 270 BottomC129 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 392 1802 0 BottomC130 15182103 .01uF CAPACITOR, CHIP, 0402,Z5U,5/10/20 571 904 90 BottomC131 15110330 33PF NPO 0805 50V CHIP 38 1263 0 BottomC132 15110330 33PF NPO 0805 50V CHIP 64 1156 270 BottomC133 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 61 2123 0 BottomC134 15182103 .01uF CAPACITOR, CHIP, 0402,Z5U,5/10/20 39 1635 90 TopC135 15110220 22PF NPO 0805 50V CHIP CAP 171 1533 180 BottomC201 15180330 33pF CAPACITOR, CHIP, 0402, C0G, 5% 1524 2585 0 TopC202 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 871 3384 270 BottomC203 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1004 3248 90 BottomC204 151105A6 5.6PF NPO 0805 50V CHIP CAPACITOR 1466 2357 0 TopC205 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 1517 267 270 TopC206 15110150 15PF 0805 NPO 50V CHIP CAP 1572 239 270 TopC207 151108A2 8.2PF NPO 0805 50V CHIP 1571 3084 270 TopC208 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1375 2883 90 TopC209 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 977 3530 180 TopC210 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1277 3493 270 BottomC211 15110150 15PF 0805 NPO 50V CHIP CAP 1278 3267 90 TopC212 15180330 33pF CAPACITOR, CHIP, 0402, C0G, 5% 977 3481 180 TopC213 151106A8 6.8PF NPO 0805 50V CHIP 1682 3881 90 TopC214 15110120 12PF NPO 0805 50V CHIP CAP 1682 3881 180 TopC215 151108A2 8.2PF NPO 0805 50V CHIP 1614 4120 180 TopC216 Factory Select 1439 4093 90 TopC217 151101A8 1.8PF 0805 50V CHIP CAP. 1035 4136 90 TopC218 15110101 100PF NPO 0805 50V CHIP CAP 953 4136 90 TopC219 151104A7 4.7PF 0805 50V CHIP CAP. 1682 3881 180 TopC301 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 774 817 180 BottomC302 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 275 522 270 TopC303 152B4226 22uF 6.3V 3.4 X 2.8 CHIP TANTALUM CAP 199 647 180 Top
SCHEMATIC REFERENCE PARTS LIST SST-44228Ref Ritron PN Description X Y Theta LocC304 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1261 4590 90 BottomC305 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1027 405 0 TopC306 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 613 402 270 TopC307 15182103 .01uF CAPACITOR, CHIP, 0402,Z5U,5/10/20 20 4621 270 TopC309 15182103 .01uF CAPACITOR, CHIP, 0402,Z5U,5/10/20 582 1865 90 BottomC310 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 1106 328 0 TopC311 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1229 2967 90 BottomC312 15182103 .01uF CAPACITOR, CHIP, 0402,Z5U,5/10/20 544 4622 270 TopC313 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 169 3033 270 TopC314 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1280 2589 180 BottomC315 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1280 2271 180 BottomC316 15182103 .01uF CAPACITOR, CHIP, 0402,Z5U,5/10/20 826 2291 180 TopC317 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 704 2321 0 BottomC318 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 826 2371 180 TopC319 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 704 2360 0 BottomC320 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1280 2403 180 BottomC321 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1280 2496 180 BottomC322 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1280 2311 180 BottomC323 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1280 2771 180 BottomC324 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 969 2221 0 TopC325 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1280 2672 180 BottomC326 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1280 2628 180 BottomC327 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1280 2350 180 BottomC328 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 655 2408 0 TopC329 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 634 2471 270 BottomC330 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 704 2612 0 BottomC331 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 704 2690 0 BottomC332 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 704 2729 0 BottomC333 152A6475 4.7UF 10V A-SIZE TANTALUM CHIP CAP 493 2701 180 TopC334 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 82 2765 180 BottomC335 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 366 2880 270 BottomC336 15181332 .0033uF CAPACITOR, CHIP, 0402, X7R,5/10% 454 3156 90 BottomC337 152B6106 10uF 10V 3.4 X 2.8 CHIP TANTALUM 724 3558 270 BottomC338 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 254 3144 90 TopC339 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 245 2964 270 TopC340 15111333 .033MFD X7R 0805 50V CHIP CAP 331 2665 270 BottomC341 15182103 .01uF CAPACITOR, CHIP, 0402,Z5U,5/10/20 585 2328 270 BottomC342 15110821 820PF NPO 0805 50V CHIP CAP 638 2982 180 BottomC343 15111102 .001MF X7R 0805 50V CHIP CAP 637 3063 180 BottomC344 15181472 .0047uF CAPACITOR, CHIP, 0402, X7R,5/10% 179 2432 0 TopC345 15181472 .0047uF CAPACITOR, CHIP, 0402, X7R,5/10% 264 2432 0 TopC346 152A8105 1MFD 16V ~3.2 X 1.6~ CHIP TANTALUM 614 2232 90 TopC347 15180180 18pF CAPACITOR, CHIP, 0402, COG, 5% 286 2500 90 TopC348 15119473 .047uF X7R 0805 25V CHIP CAPACITOR 474 2595 0 TopC349 15111333 .033MFD X7R 0805 50V CHIP CAP 82 2657 90 BottomC350 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 493 3156 90 BottomC351 15181222 .0022uF CAPACITOR, CHIP, 0402, X7R,5/10% 35 2641 270 TopC352 15180100 10pF CAPACITOR, CHIP, 0402, COG, 5% 436 3228 90 TopC353 15182103 .01uF CAPACITOR, CHIP, 0402,Z5U,5/10/20 594 3131 180 BottomC354 15181221 220pF CAPACITOR, CHIP, 0402, X7R, 5/10% 379 2436 90 BottomC355 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 250 2413 180 BottomC356 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 188 2434 90 BottomC357 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 125 2415 180 TopC358 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 585 2498 90 BottomC359 15180100 10pF CAPACITOR, CHIP, 0402, COG, 5% 450 2573 270 BottomC360 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 464 2283 270 TopC361 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 459 2139 90 BottomC362 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 981 752 270 BottomC363 152B6106 10uF 10V 3.4 X 2.8 CHIP TANTALUM 1231 427 0 TopC364 152B6106 10uF 10V 3.4 X 2.8 CHIP TANTALUM 1075 455 90 BottomC365 01503212 220MF 10V ELT CAPACITOR, 5mm HEIGHT 1493 5509 0.399 TopC366 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 1509 720 180 BottomC367 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 1357 814 90 BottomC368 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 220 2695 270 Bottom
SCHEMATIC REFERENCE PARTS LIST SST-44229Ref Ritron PN Description X Y Theta LocC369 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 664 2454 90 TopC370 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 297 2861 180 TopC371 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 704 2651 0 BottomC372 15111103 .01MF X7R 0805 50V CHIP 444 719 270 BottomC373 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 364 2322 270 BottomC374 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 566 2583 90 BottomC401 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1566 1966 270 TopC402 151104A7 4.7PF 0805 50V CHIP CAP. 1640 194 90 TopC403 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1680 1828 90 TopC404 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1066 1850 180 TopC405 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1353 2013 180 TopC406 151101A5 1.5PF NPO 0805 50V CHIP 1182 1785 270 TopC407 151104A7 4.7PF 0805 50V CHIP CAP. 1463 1604 0 TopC408 151104A7 4.7PF 0805 50V CHIP CAP. 1572 1634 270 TopC409 15119104 .1uF X7R 0805 25V CERAMIC CHIP CAP 980 1766 90 TopC410 151104A7 4.7PF 0805 50V CHIP CAP. 1355 158 270 TopC411 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1262 130 270 TopC412 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1047 1788 90 TopC413 151102A7 2.7pf NPO 0805 CHIP CAPACITOR 1462 1441 270 TopC414 152B6106 10uF 10V 3.4 X 2.8 CHIP TANTALUM 722 1625 0 TopC415 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 1535 969 270 TopC416 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1731 1114 270 TopC417 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1538 1356 90 TopC418 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 677 1121 180 TopC419 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 678 1213 180 TopC420 15181102 .001uF CAPACITOR, CHIP, 0402, X7R, 5/10% 678 1260 180 TopC421 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1053 1576 180 TopC422 15110100 10PF NPO 0805 50V CHIP CAP 1119 1512 180 TopC423 151101A0 1.0PF NPO 0805 50V CHIP 1256 1400 0 TopC424 151108A2 8.2PF NPO 0805 50V CHIP 1187 1252 270 TopC425 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1069 937 90 TopC426 15111222 .0022uF X7R 0805 50V CHIP CAPACITOR 832 922 180 TopC427 152AB334 .33MF 35V ~3.2X1.6~ CHIP TANTALUM 812 1015 0 TopC428 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 855 1473 270 TopC429 15111333 .033MFD X7R 0805 50V CHIP CAP 1029 1015 0 TopC430 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 971 1460 270 TopC431 15182103 .01uF CAPACITOR, CHIP, 0402,Z5U,5/10/20 687 1393 180 TopC432 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 766 1100 180 TopC433 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 932 1460 90 TopC434 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 1101 1264 0 TopC435 15180101 100pF CAPACITOR, CHIP, 0402, COG, 5% 687 1355 180 TopDIODESCR101 48D100A2 MA4CP101A PIN DIODE, SOT-23 1178 3820 90 TopCR102 48E1005G MMBD-352LT1 SCHOTTKY DIODE SOT23 906 3682 270 TopCR103 48A1005C MMBD7000, DUAL DIODES IN SERIES, SOT-23 366 2119 0 BottomCR201 48D100A2 MA4CP101A PIN DIODE, SOT-23 1302 3991 0 TopCR301 48B61012 1N4742A ZENER DIODE, 12V 1W DL-41 MELF 991 604 90 TopCR302 48AA01SA DIODE, 1A, 50V, SMT, D0214AC CASE 1154 630 90 TopCR303 48A1005B MMBD6100, DUAL DIODES, COM CATHODE, SOT2 363 431 90 TopCR304 48A100A3 MMBD2835, DUAL DIODES, COM ANODE, SOT-23 65 4089 0 TopCR305 48A1005C MMBD7000, DUAL DIODES IN SERIES, SOT-23 615 2821 0 BottomCR306 48A1005C MMBD7000, DUAL DIODES IN SERIES, SOT-23 462 2949 90 BottomCR307 48AA01SA DIODE, 1A, 50V, SMT, D0214AC CASE 1290 630 90 TopCR401 48A1005C MMBD7000, DUAL DIODES IN SERIES, SOT-23 695 1808 90 TopCR402 48C1004E MMBV-105G DIODE VVC, SOT-23 1155 1115 180 TopCR403 48C1004G MMBV-2101L DIODE VVC SOT-23 1119 1400 180 TopCR404 48A1004D MMBV3401 PIN/UHF DIODE SOT-23 1552 1239 270 TopFUSEF301 06000040 WIRE; #40AWG TINNED BUS (INCHES) 754 603 270 Bottom
SCHEMATIC REFERENCE PARTS LIST SST-44230Ref Ritron PN Description X Y Theta LocINTEGRATED CIRCUITSIC101 31030003 MC3371D SUBSYSTEM IC, SO-16 314 1158 270 BottomIC301 314G0306 MCU, 28 PIN, SOIC, SST/JMX 4 SERIES v06 992 2546 0 BottomIC302 31210005 EEPROM, 512X8, 24C04 989 2501 180 TopIC303 310K0004 LMV324MT RAIL TO RAIL QUAD OP AMP 474 2442 180 TopIC304 311K0003 SWITCH,ANALOG,TRIPLE SPDT,4053,TSSOP-16 226 2683 0 TopIC305 310K0003 LMV358MM DUAL OP AMP, GP LV R/R TSSOP 404 3120 0 TopIC306 310K0001 DS1806E 6 PROG POTS 10K OHM 20-PIN TSSOP 242 2185 0 TopIC307 31010004 LM386MX-1 AUDIO AMP SO-8 1331 583 90 BottomIC308 310K0002 MAX7410 5TH ORDER SW CAP BUTTERWORTH LPF407 2946 0 TopIC309 310E0002 REGULATOR,LDO,LP2980,5V,W ENABLE,SOT-25 162 504 0 TopIC401 313K0005 SYNTHESIZER, MC145193, TSSOP 891 1265 180 TopJACKSJ301 02100001 2.5MM PC-MT JACK; ANT-CHGR 1178 4668 0 TopJ303 02100053 3.5MM STEREO JACK; PANEL MOUNT 1560 4646 0 TopINDUCTORSL101 01850201 1.5T SW COIL W/5MM SHIELD & ALUM CORE 721 4291 90 TopL102 18110151 CHIP INDUCTOR .15uhy 629 3722 270 TopL103 01850201 1.5T SW COIL W/5MM SHIELD & ALUM CORE 484 4291 270 TopL104 01850201 1.5T SW COIL W/5MM SHIELD & ALUM CORE 204 4292 270 TopL105 18433103 3T AIRCOIL, SMT, 8.0nH, .120 X .145 332 3901 0 TopL106 18110102 CHIP INDUCTOR 1.0uhy 280 3474 0 TopL107 18433101 1T AIRCOIL, SMT 2.5nH, .120 X .145 480 3492 180 TopL108 18110681 CHIP INDUCTOR .68uhy 51 1658 180 BottomL201 18414104 4.5T AIRCOIL #24AWG .0625ID RHH SMT 1399 2474 180 TopL203 18414104 4.5T AIRCOIL #24AWG .0625"ID RHH SMT 1478 2880 180 TopL204 18433102 2T AIRCOIL SMT 5.0nH .120 X .145 1591 3250 90 TopL205 18110103 CHIP INDUCTOR 10uhy 1386 3262 90 TopL206 18414108 8.5T AIRCOIL #24AWG .0625"ID RHH SMT 1143 3523 180 TopL207 18433102 2T AIRCOIL SMT 5.0nH .120 X .145 1737 3765 0 TopL208 18414104 4.5T AIRCOIL #24AWG .0625"ID RHH SMT 1695 4001 90 TopL209 18414104 4.5T AIRCOIL #24AWG .0625"ID RHH SMT 1479 3945 180 TopL210 18110102 CHIP INDUCTOR 1.0uhy 1335 3804 90 TopL211 18414105 5.5T AIRCOIL #24AWG .0625"ID RHH SMT 1093 3979 90 TopL212 18433102 2T AIRCOIL SMT 5.0nH .120 X .145 932 4343 0 TopL401 18433208 8T AIRCOIL, SMT, 8.80 nH, .159 X .056 1376 1418 270 TopL402 18414109 9.5T AIRCOIL #24AWG .0625"ID RHH SMT 1352 118 0 TopL403 18110820 INDUCTOR, CHIP 82nH 1548 109 270 TopL404 18110101 CHIP INDUCTOR 0.1uhy 1205 966 270 TopL405 18110101 CHIP INDUCTOR 0.1uhy 753 1485 0 TopMICROPHONEM301 05500037 MICROPHONE; ELECTRET, MINIATURE 0 0 0 BottomCONNECTORSP201 25500700 CONTACT, PCB MNT, ANTENNA,SST 896 4550 90 TopP302 21310021 HEADER, 2 PIN SIDE ENTRY SHROUDED 754 737 0 TopTRANSISTORSQ101 4801002A MMBT3906 PNP, SOT23 675 3405 270 TopQ102 482100V0 TRANSISTOR, NPN, UHF, SOT-23, PBR-941 734 3828 0 TopQ103 4841006U MMBFJ309LT1, N-CHAN, RF, SOT23 340 3639 270 TopQ104 4821003B MMBT918LT1 VHF SOT23 (3B) 270 3548 0 BottomQ105 4821003B MMBT918LT1 VHF SOT23 (3B) 38 1374 180 BottomQ201 480100DH BCW68GLT1 .8AMP PNP SOT-23 908 3268 90 BottomQ202 4801001Q MMBT5088, NPN, SOT-23 766 3268 270 BottomQ203 482100V0 TRANSISTOR, NPN, UHF, SOT-23, PBR-941 1453 2248 270 TopQ204 48280001 BFG135 WB SOT-223 1W TRANSISTOR 1699 291 50 TopQ205 04801013 MRF-630 3 W UHF AMP TRAN. NPN 1469 3543 0 Top
SCHEMATIC REFERENCE PARTS LIST SST-44231Ref Ritron PN Description X Y Theta LocQ301 48010R02 MUN2211T1, NPN, INT 10K/10K BIAS, "8A", 1133 2987 90 BottomQ302 4801002A MMBT3906 PNP, SOT23 1094 3124 90 BottomQ303 4801001Q MMBT5088, NPN, SOT-23 583 519 0 TopQ304 480100DH BCW68GLT1 .8AMP PNP SOT-23 445 668 0 TopQ306 480100DH BCW68GLT1 .8AMP PNP SOT-23 1222 2259 90 TopQ307 4801001Q MMBT5088, NPN, SOT-23 964 615 0 BottomQ308 480100DH BCW68GLT1 .8AMP PNP SOT-23 1162 669 0 BottomQ401 482100V0 TRANSISTOR, NPN, UHF, SOT-23, PBR-941 1470 1919 270 TopQ402 482100V0 TRANSISTOR, NPN, UHF, SOT-23, PBR-941 1289 1920 270 TopQ403 482100V0 TRANSISTOR, NPN, UHF, SOT-23, PBR-941 1460 1714 270 TopQ404 4801001Q MMBT5088, NPN, SOT-23 837 1766 270 TopQ405 4801006A MUN2111T1, PNP, INT 10K/10K BIAS, SC-59 1634 1376 270 TopQ406 48010R02 MUN2211T1, NPN, INT 10K/10K BIAS, "8A", 1691 1234 0 TopRESISTORSR101 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 579 3344 90 TopR102 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 734 3581 180 TopR103 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 773 3709 270 TopR104 47180392 3.9K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 829 3810 270 TopR105 47180561 560 OHM RESISTOR, CHIP, 0402, 1/16W, 5% 714 3519 270 TopR106 47180152 1.5K OHM RESISTOR, CHIP, 0402, 1/16W,5% 475 3610 270 TopR107 47180152 1.5K OHM RESISTOR, CHIP, 0402, 1/16W,5% 388 3484 180 BottomR108 47180223 22K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 251 3450 180 BottomR109 47180101 100 OHM RESISTOR, CHIP, 0402,1/16W,5% 167 3450 180 BottomR110 47180154 150K OHM RESISTOR, CHIP, 0402, 1/16W,5% 411 946 270 BottomR111 47180122 1.2K OHM RESISTOR, CHIP, 0402, 1/16W,5% 529 904 270 BottomR112 47180224 220K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 349 966 180 BottomR113 47180123 12K OHM RESISTOR, CHIP, 0402, 1/16W,5% 489 946 90 BottomR114 47180152 1.5K OHM RESISTOR, CHIP, 0402, 1/16W,5% 551 966 0 BottomR115 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 153 2174 270 BottomR116 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 153 2089 90 BottomR117 47180393 39K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 117 1676 90 TopR118 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 49 1509 0 BottomR119 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 49 1470 180 BottomR120 47180681 680 OHM RESISTOR, CHIP, 0402, 1/16W, 5% 78 1635 90 TopR201 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 790 3384 90 BottomR202 47180471 470 OHM RESISTOR, CHIP, 0402, 1/6W, 5% 669 3248 270 BottomR203 47180181 180 OHM RESISTOR, CHIP, 0402, 1/16W, 5% 897 3151 90 BottomR205 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 1357 2228 90 TopR206 47180152 1.5K OHM RESISTOR, CHIP, 0402, 1/16W,5% 1318 2228 90 TopR207 47100470 47 OHM 0805 CHIP RES. 1438 2678 270 TopR208 47180222 2.2K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1605 2718 180 TopR209 47180271 270 OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1720 271 180 TopR210 47180221 220 OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1277 3581 270 TopR211 47180181 180 OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1217 3726 180 TopR212 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 879 4148 90 TopR301 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 536 686 90 TopR302 47100471 470 OHM 0805 CHIP RES. 475 479 270 TopR303 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 316 546 90 TopR304 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 623 639 270 TopR305 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 409 547 270 TopR306 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 621 1865 90 BottomR307 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 995 3143 90 BottomR308 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 1086 334 5180 TopR309 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 1257 2891 270 BottomR310 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 704 2191 0 BottomR311 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 504 4622 270 TopR312 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 704 2230 0 BottomR313 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 1206 2376 270 TopR314 47180472 4.7K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1260 2375 270 TopR315 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 709 2834 90 BottomR316 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 761 2506 90 TopR317 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 800 2506 90 TopR318 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 704 2520 180 Bottom
SCHEMATIC REFERENCE PARTS LIST SST-44232Ref Ritron PN Description X Y Theta LocR319 47180471 470 OHM RESISTOR, CHIP, 0402, 1/6W, 5% 704 2768 180 BottomR320 47180471 470 OHM RESISTOR, CHIP, 0402, 1/6W, 5% 638 2917 0 BottomR321 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 760 2951 180 BottomR322 47180393 39K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 274 3069 270 BottomR323 47180823 82K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 371 3070 270 BottomR324 47180224 220K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 313 3070 270 BottomR325 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 416 3156 90 BottomR326 47180183 18K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 585 2413 270 BottomR327 47180183 18K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 624 2328 90 BottomR328 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 477 2791 270 BottomR329 47180153 15K OHM RESISTOR, CHIP, 0402, 1/16W,5% 179 2391 180 TopR330 47180100 10 OHM RESISTOR, CHIP,0402, 1/16W 5% 664 2369 90 TopR331 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 264 2392 0 TopR332 47180154 150K OHM RESISTOR, CHIP, 0402, 1/16W,5% 207 2501 90 TopR333 47180473 47K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 246 2500 90 TopR334 47180273 27K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 566 2588 90 TopR335 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 43 2774 270 TopR336 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 4 2774 270 TopR337 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 532 3156 270 BottomR338 47180224 220K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 397 3228 90 TopR339 47180394 390K OHM RESISTOR, CHIP, 0402, 1/6W, 5% 468 2366 270 BottomR340 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 340 2436 90 BottomR341 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 250 2455 0 BottomR342 47180184 180K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 63 2395 270 BottomR343 47180564 560K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 741 3130 0 TopR344 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 21 2428 270 BottomR345 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 125 2455 180 BottomR346 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 742 3092 180 BottomR348 47180473 47K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 411 2573 270 BottomR349 47180823 82K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 29 2146 0 TopR350 47180564 560K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 29 2198 0 TopR352 47100225 2.2M 0805 CHIP RESISTOR 44 2406 0 TopR353 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 486 2166 180 TopR354 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 847 653 180 BottomR355 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 912 772 90 BottomR356 47180273 27K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1181 765 0 BottomR357 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 1183 534 270 BottomR358 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 250 2374 180 BottomR359 47180100 10 OHM RESISTOR, CHIP,0402, 1/16W 5% 1601 741 270 BottomR362 47180100 10 OHM RESISTOR, CHIP,0402, 1/16W 5% 507 2622 180 BottomR401 47180221 220 OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1517 2006 90 TopR402 47180101 100 OHM RESISTOR, CHIP, 0402,1/16W,5% 1640 1828 270 TopR403 47180272 2.7K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1450 2013 180 TopR404 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 1452 1825 180 TopR405 47180101 100 OHM RESISTOR, CHIP, 0402,1/16W,5% 1153 1900 270 TopR406 47180272 2.7K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1193 1900 270 TopR407 47180470 47 OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1086 1788 270 TopR408 47180470 47 OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1067 1726 180 TopR409 47180271 270 OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1636 1655 90 TopR410 47180153 15K OHM RESISTOR, CHIP, 0402, 1/16W,5% 1266 162 5180 TopR411 47180153 15K OHM RESISTOR, CHIP, 0402, 1/16W,5% 1363 1694 270 TopR412 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 1271 1827 180 TopR413 47180472 4.7K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 677 1903 0 TopR414 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 1634 1531 270 TopR415 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 1641 1068 90 TopR416 47180104 100K OHM, RESISTOR, CHIP, 0402,1/16W,5% 1138 1576 0 TopR417 47180102 1K OHM RESISTOR, CHIP,0402, 1/16W,5% 938 937 90 TopR418 47180473 47K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 938 1022 90 TopR419 47180822 8.2K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 718 906 0 TopR420 47180103 10K OHM, RESISTOR, CHIP, 0402,1/16W,5% 718 946 180 TopR421 47180392 3.9K OHM RESISTOR, CHIP, 0402, 1/16W, 5% 1101 1303 0 TopR422 47180100 10 OHM RESISTOR, CHIP,0402, 1/16W 5% 894 1461 90 TopR423 47180474 470K OHM RESISTOR, 0402, 1/16W, 5% 850 1100 180 Top
SCHEMATIC REFERENCE PARTS LIST SST-44233SPEAKERSP301 05500045 SPEAKER, 45MM, 1W, LOW PROFILE SST/RTX 0 0 0 BottomSWITCHESSW301 05100042 SWITCH SPST MOMENTARY MINI PC 260GM 268 4587 180 TopSW302 05100042 SWITCH SPST MOMENTARY MINI PC 260GM 788 4588 180 TopSW303 05100046 SWITCH, TACT LO PROFILE RT ANGLE 160gf 82 3097 270 TopSW304 05100046 SWITCH, TACT LO PROFILE RT ANGLE 160gf 82 3948 270 TopTRANSFORMERT101 05600018 455KHZ IF TRANSFORMER (5MM) 128 1822 180 TopCRYSTALY302 23050003 TCVCXO, 14.400 MHz, 1.5 PPM, VC=30 PPM/V 146 837 90 TopFILTERSYF101 02301403 43.650 MHz Crystal Filter +/-6.0KHz UM-1 44 3524 90 TopYF102 02301013 FILTER,CERAMIC,450KHz,+/-7.5KHz,6 POLE 249 1614 90 TopHARDWARE1750270A PCB, ML4 FR4 5UPM, .062 MIX, SST-44225602500 CRYSTAL SUPPORT, RUBBER PAD, SMALL/UM-106001010 #24 AWG STRANDED WIRE; RED (INCHES)06001011 #24 AWG STRANDED WIRE; BLACK INCHES06001023 #28 AWG STRANDED WIRE;GREEN INCHES06001029 #28 AWG STRANDED WIRE; BLUE INCHES25105500 SHIELD, SST-PLUS SYNTHESIZER25603000 FOAM, MOUNTING, SPEAKER,SST25603900 SPACER, MIC FOAM, SST25605700 MICROPHONE HOLDER, SST-PLUSANTENNAAFS-450 ANTENNA UHF MOLDED, 450-470 REG LEN SSTMAIN CASE ASSEMBLY13250000 CASE W/INSERT, PLASTIC, SST BLACK13578000 DOOR, BATTERY, PLASTIC, SST 2-PC13588000 LATCH, BATTERY DOOR, PLASTIC SST 2-PC25106400 BATTERY DOOR HINGE RETAINER25201500 RETAINER, PLASTIC, PTT, SST25400600 BUSHING, THREADED, PLATED, ANTENNA SS25603300 GRILLE CLOTH, SPEAKER, SST25603400 DUAL JACK PLUG, RUBBER,SST25606200 HINGE, BATTERY DOOR, SST25800500 ACTUATOR, RUBBER,PTT,SST25800600 ACTUATOR, RUBBER, TACT, SST02802026 NUT; KNURLED; M4PO.5;/2.5MM JACK02802027 NUT; KNURLED; M6PO.5/3.5MM JACK28112401 SCREW 4-40 X 1/4" PHFLST28233G03 KNURLED NUT, ANTENNA, JMXCASE BOTTOM ASSEMBLY13564000 CASE, BOTTOM, PLASTIC, SST 2-PC2142D021 CONNECTOR, CABLE ASSEMBLY, 2-POS, SST+25400800 SPRING CONTACT, BATTERY, SST W/O TABSC25400900 CONTACT BATTERY SST-PLUS (POLARIZED)25604800 SPACER, PCB, FOAM, SST 2-PCBELT CLIP25201600 BELT CLIP, PLASTIC, SST BLACK2811B600 SCREW 6-32 X 1/4" PHTRST
SCHEMATIC REFERENCE PARTS LIST SST-44234Ritron PN DescriptionSST-442 MODELS ONLYCASE LABELS14220001 LABEL, CONTROLS, SST14222029 LABEL, NAMEPLATE, SST14290002 BLANK LABEL, .75" X .25" GLOSSY WHITE14200037 LABEL SST/JMX MFG DATE CODE14200100 LABEL, FCC SERIAL, SST-442BATTERY PACK AND INSULATORBPS-6N-SC BATTERY,RECHG,7.2V NiCd,BLUE ,SST14230088 LABEL, BATTERY, BPS-6N-SC, SST25300600 INSULATOR, BATTERY, FIBRE, SST25606000 FOAM SUPPORT, BATTERY JMX SERIES25601600 BATTERY SHIM; ASSEMBLY ~X~ SERIESPACKING MATERIALS14210004 LOW BATTERY NOTICE LABEL14312006 SHIPPING CARTON, CARDBOARD,SST14321002 FOAM INSERT, PACKING, SST/MINI14500025 OWNER'S MANUAL, 14x/44x SERIES, JMX/SST14540006 WARRANTY REGISTRATION CARDJMX-442 MODELS ONLYCASE LABELS14220002 LABEL, CONTROLS, JMX14222035 LABEL, NAMEPLATE, JMX14290002 BLANK LABEL, .75" X .25" GLOSSY WHITE14200037 LABEL SST/JMX MFG DATE CODE14200101 LABEL, FCC SERIAL, JMX-442BATTERY PACK AND INSULATORBPJS-6N BATTERY, YELLOW, RECHG,7.2V NiCd 700 mAHBC-A BATTERY CHARGER, 120VAC-5.5VDC 100mA14230088 LABEL, BATTERY, BPS-6N-SC, SST25300600 INSULATOR, BATTERY, FIBRE, SST25606000 FOAM SUPPORT, BATTERY JMX SERIES25601600 BATTERY SHIM; ASSEMBLY ~X~ SERIESPACKING MATERIALS14210004 LOW BATTERY NOTICE LABEL14313012 BOX, CHIPBOARD, SMALL, 4 COLOR, JMX14352004 INSERT, CORREGATED CARDBOARD, JMX14500025 OWNER'S MANUAL, 14x/44x SERIES, JMX/SST14540006 WARRANTY REGISTRATION CARD14610006 JOBCOM BROCHURE

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