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GENERAL INFORMATION
1-8
November 1999
Part No. 001-7780-500
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(withbatteryandcontrols) 6.5”Hx2.2”Wx1.2”D
166mmHx56mmWx30mmD
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)