EFJohnson 764X, 761X service manual VHF AND 7640 UHF MOBILE SPECIFICATIONS, General

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