EFJohnson 7780 service manual Specifications, General

GENERAL INFORMATION

7780 SPECIFICATIONS

The following are general specifications intended for use in testing and servicing the transceiver. For current advertised specifications, refer to the 7780 product information sheet available from your E.F. Johnson sales representative. Specifica- tions are subject to change without notice.

	GENERAL
Operating Mode	SMARTNET/SmartZone (trunked) and conventional (non-trunked)
Frequency Range	806-824 MHz transmit (SMARTNET/SmartZone/conventional standard)
	851-869 MHz transmit (conventional talk-around)
	851-869 MHz receive
Zones Programmable	Up to 16
Channels Programmable	Up to 16 per zone (256 total)
Transmit/Receive Separation	45 MHz standard, 0 MHz conventional talk-around
Channel Spacing	12.5 kHz - 2.5 kHz maximum deviation
	25 kHz - 5 kHz max deviation standard, 4 kHz NPSPAC
Frequency Stability (tx and rx)	1.5 PPM –22° to +140° F (–30° to +60° C)
Dimensions (with battery and controls)	6.5” H x 2.2” W x 1.2” D
	166 mm H x 56 mm W x 30 mm D
Weight (with battery)	18 oz. (515 g)
Power Source	7.5 VDC nickel metal-hydride (NiMH) battery pack, 1300 maH
Typical Battery Life (5-5-90)	7.5 hours (high power), 8.6 hours (low power)
Compliance	FCC parts 15 and 90
Circuit Protection	3-ampere fuse
	RECEIVER
Sensitivity	0.35 µV (12 dB SINAD)
Selectivity	–65 dB at 25 kHz
Spurious and Image Rejection	–60 dB at 25 kHz
Intermodulation	–65 dB at 25 kHz
Audio Output Power	Internal Speaker - 0.5 watt (16-ohm load)
	External - 1.5 V rms (680-ohm load)
Audio Distortion	Less than 5% at rated power (0.5 watt)
Audio Response	+1, –3 dB at 6 dB per octave de-emphasis characteristic
Channel Spread	18 MHz
Current Drain	Standby (squelched) - 92 mA maximum
	Rated Audio Output - 300 mA maximum
	TRANSMITTER
High RF Power Output
Standard Models	3.0 watts (standard mode)
	2.5 watts (conventional talk-around mode)
Intrinsically Safe Models	2.0 watts at less than 1.55 A (standard mode)
	1.8 watt at less than 1.60 A (talk-around mode)
Low RF Power Output	1.0 watt (all models and modes)
Spurious and Harmonic	–60 dB at 25 kHz
FM Hum and Noise	–40 dB at 25 kHz
Audio Distortion	5% maximum at 1 kHz
Audio Frequency Response	+1, –3 dB from a 6 dB per octave pre-emphasis characteristic
Audio Modulation	11K0F3E, 16K0F3E, 14K0F3E
Channel Spread	18 MHz (no degradation); 63 MHz (talk-around)
Current Drain (maximum)	Low Power - 1.3 ampere
	High Power Standard Models -1.75 ampere (2.0 ampere talk-around)
Load Impedance	50 ohms
Duty Cycle (6-6-48 seconds)	5% (Transmit-Receive-Standby)
November 1999
Part No. 001-7780-500	1-8