EFJohnson 764X, 761X service manual VHF and 7640 UHF Mobile Specifications, General

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GENERAL INFORMATION

7610 (VHF) AND 7640 (UHF) MOBILE SPECIFICATIONS

The following are general specifications intended for use in testing and servicing this transceiver. For current advertised specifications, refer to the specification sheet available from your sales representative. Values are typical and are subject to change without notice.

 

GENERAL

Frequency Range

VHF: 146-174 MHz

 

UHF: 400-430 MHz, 450-470 MHz, 470-490 MHz, or 488-512 MHz (some

 

performance degradation from 488-490 MHz with 488-512 MHz models)

Operating Modes

Conventional (non-trunked), Tone and digital Call Guard® squelch

Channels

32 maximum (2 banks x 16 channels available)

Transmit/Receive Separation

Any frequency within the range

Channel Spacing (dual IF Models)

VHF - 12.5 kHz (narrow band) and 30 kHz (wideband)

 

UHF - 12.5 kHz (narrow band) and 25 kHz (wideband)

Maximum Deviation

12.5/15 kHz channel spacing - 2.5 kHz maximum

 

25 kHz channel spacing - 5.0 kHz maximum

Frequency Stability

5.0 PPM (VHF), 2.5 PPM (UHF) from –22° to +140° F (–30° to +60° C)

Dimensions (w/o controls)

1.6” H x 5.5” W x 6.7” D (4.1 cm x 13.9 cm x 17.0 cm)

Weight

2 lb. 11 oz. (1.22 kg)

Supply Voltage

13.6 volts DC nominal (12-volt, negative ground vehicle electrical system)

Current Drain (maximum)

Standby - 200 mA standby

 

Receive (rated audio out) - 700 mA

 

Medium Tx Power - 6.0 A (VHF), 7.0 A (UHF)

 

High Tx Power - 15 A max/10 A typ (VHF), 11 A max/8 A typ (UHF)

FCC Compliance

Parts 15 and 90

 

RECEIVER

Sensitivity (12 dB SINAD)

0.25 µV

Selectivity

70 dB at 25 kHz, 60 dB at 12.5 kHz

Spurious and Image Rejection

70 dB

Intermodulation

65 dB

Hum and Noise

46 dB at 25 kHz, 40 dB at 12.5 kHz

Maximum Frequency Spread

Any spread within the range

Audio Power Output

3.5 W into 4-ohm load

Audio Distortion

Less than 10% at 1 kHz with 60% deviation

Audio Response

+2, –8 dB at 6 dB per octave de-emphasis

RF Input Impedance

50 ohms

 

TRANSMITTER

RF Power Output

VHF: 45W (high), 25W (low 1), 4.5W (low 2)

 

UHF: 35W (high), 20W (low 1), 3.5W (low 2)

Spurious and Harmonic Emissions

70 dB

FM Hum and Noise

46 dB at 25 kHz, 40 dB at 12.5 kHz

Audio Modulation

12.5 kHz - 11K0F3E, 25 kHz - 16K0F3E

Audio Distortion

Less than 5% at 1 kHz with 40% modulation

Audio Frequency Response

+2, –8 dB at 6 dB per octave pre-emphasis

Maximum Frequency Spread

Any spread within the band

RF Output Impedance

50 ohms

Duty Cycle

20% TIA

 

November 1998

1-5

Part No. 001-7600-001

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Contents 761x VHF 764x UHF Conventional Mobile Conventional FM TWO-WAY Radio Table of Contents Table of Contents CONT’D Schematic Diagrams and Component Layouts General Information Toll-Free 800 75xx AccessoriesAccessory Factory ReturnsReplacement Parts Internet HomeThis page intentionally left blank VHF and 7640 UHF Mobile Specifications GeneralGeneral Information Installation and Disassembly Transceiver InstallationPower Cable Installation Installing Mounting BracketInstalling Microphone Hanger Cable InstallationUsing AN External Speaker Power Cable FusesChanging 20-Ampere Power Cable Fuses Accessory Cable InstallationRemoving PC Board Transceiver DisassemblyRemove shield E Setting 5-Tone Deviation 2-TONE/5-TONE Module InstallationInstallation Procedure 2 2-TONE ProgrammingInstallation and Disassembly Features OperationTransceiver Back Panel Controls and DisplayBasic Operation Direct Selection The F1-F4 Receiving and Placing Calls Option Key Programmable Functions TIME-OUT TimerProgrammable Functions Function Key Label Description Section NoCall Guard Tone Select Monitor Mode SelectOutput Power Select Channel SelectChannel Scan Priority Channel Sampling Programming Cables Programming SetupSection Programming Programming SoftwareMenu Flow Starting the ProgramSpecial Keys and Functions File MenuPrint Menu Screen MenuProgram Menu Model MenuMemory Channel Screen Description LMR Models Setup MenuParameter Description Bank Select Frequency TimerCh Atr Rx/TxScan Auto ResetLockout ToneKey and Display Assign Screen Description Key DescriptionKey Description Label Selection RF PowerDtmf Autodial Screen Description Bank/FreeScan Function Screen Description Continuous Tone Screen DescriptionParameter Description Resume Stop Timer2-Tone Code Channel Screen Description Auto CHAuto Tx EXO TimerTimer Auto Tx StunCommon Screen Description Expert Screen Description Unique PMR European Screens Unique PMR ScreensCloning Programming ONE Transceiver with Another Memory Channel Screen PMR Models This page intentionally left blank VHF 7610 Circuit Description VHF Receiver CircuitAudio Amplifier Circuit Receiver Mute CircuitMicrophone Amplifier Circuit Power Amplifier ModuleVHF Transmitter Circuit Modulation CircuitVHF PLL Circuit APC CircuitPLL Circuit Line Description VHF IC PIN DescriptionsPin Port Description VHF Port Expander IC11 Main Unit VHF I/O Expander IC5 Main UnitPin Pin Port Description NameUHF 7640 Circuit Description UHF Receiver CircuitSecond if System IC1 UHF UHF Transmitter Circuit PLL Circuit UHF UHF PLL CircuitUHF Power Supply UHF CPU IC1 Port AllocationUHF I/O Expander IC12 Main Unit UHF Port Expander IC13 Main UnitSuggested Test Equipment Adjustment ProcedureTest Setup Equipment Grade and RangeTest Channels Test CableVHF Test Frequencies COMPUTER-AIDED TuningUHF Test Frequencies Preliminary Setup VHF AdjustmentsVHF Adjustments PLL Adjustment VHF ModelsOutput Power Adjust VHF Adjustments CONT’DFM Deviation Adjust Bandpass Filter Adjust Dtcs Waveform AdjustReceiver Adjustments VHF Models Squelch AdjustBeep Tone Level Adjustment Beep Tone LevelPLL Adjustment UHF Models UHF AdjustmentsTransmitter Adjustments UHF Models UHF Adjustments CONT’D UHF Adjustment PointsUHF Adjustments CONT’D Receiver Adjustments UHF Models Parts List Æçìíýõ9+ôý0$,1ý81,7Íäç HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ Íëëðêäíçðíçí Íäæ Ìää HUDPLFý&ìçíåý-%ýì&ýìíé.7ð1 Íëëðêäíçðçìé Ëíí Ëäí HUDPLFý&ìçíåý-%ýìýìíê.ð7ð$ Íëëðêäíçðíçê Ëäì RLOý0/ìçíå$ýì5í.ð7 Íëëðêäíçðçèç 03ì Ýìäëëý9&2ýFDVH 5íéé 5HVý5-ê*-ýìííý9ýõìíýRKPô Íëëðêäíçðìêå 5íéè 5ìèé 5HVý5-ê*-ýìíéý9ýõìííýNýRKPô Æçéíýõ8+ôý0$,1ý81,7 Íêì HUDPLFý&ìçíåý-%ýì+ýìíë.ð7ð$ Íëëðêäíçðíçí Íêë Íäé HUDPLFý+0çí6-ý&+ýíêíýèíí9ý Õéäíðèìëý0+ô Ìèì 5HIý1Rï Êëç Íëëðêäíçðäèë 4éì 7UDQVLVWRUý7&êçê.ý7ìéæ 5íæé 5ìçå 5HVý5-ê*-ýìíéý9ýõìííýNýRKPô 5217ý81,7 Õ9+ý$1ý8+ý02/6ô =HQHUý0$åíèìð0ýõ7ô Æçìíýõ9+ôý&+$66,6ý3$576 VHF 7610 Exploded View Front UnitUHF 7640 Exploded View Main Unit Schematic Diagrams and Component LayoutsVHF 7610 Block Diagram Front UnitVHF 7610 Transistor Basing Diagrams Foldout → VHF 7610 Main Board TOP View VHF 7610 Main Board Schematic VHF Main UnitUHF 7640 Block Diagram UHF 7640 Main Board Bottom View UHF 7640 Main Board TOP View J4 T o O p tion al Un itUHF 7640 Main Board Schematic VHF/UHF Front Unit Board TOP View VHF/UHF Front Unit Board Bottom ViewVHF/UHF Front Unit Schematic UHF 7640 Transistor Basing Diagrams
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