Page 1-4
GTN 625/635/650 TSO Installation Manual
Rev. C
190-01004-02
1.3.4
COM Specifications (GTN 635/650 Only)
1.3.4.1
COM Transmitter Specifications
Characteristics
Specifications
Classes
3, 4, 5, 6
Microphone Input
Two inputs, standard carbon or dynamic mic with integrated
preamp providing minimum 70 mVRMS into 1000
load
Modulation Capability
85% with 100 to 1000 mVRMS microphone input at 1000 Hz
Modulation
AM double-sided
Emission Designator: 6K00A3E (118
– 136.975 MHz)
5K60A3E (118
– 136.992 MHz)
Frequency Range
118.000 to 136.975 MHz, 25 kHz channel spacing
118.000 to 136.992 MHz, 8.33 kHz channel spacing
Frequency Tolerance
+/-2ppm from -40°C to +70°C
Output Power
10 Watt Mode: 10 watts minimum
16 Watt Mode: 16 watts minimum
Duty Cycle
100%
16W: Recommended 25% (5 seconds on/15 seconds off,
15 seconds on/45 seconds off, etc.)
Carrier Noise Level
At least 35 dB (SNR).
Stuck Mic Time-Out
30 seconds time-out, reverts to receive
Demodulated Audio Distortion
Less than 5% distortion when the transmitter is at 85%
modulation at 350 to 2500 Hz
Sidetone
1.4 Vrms into a 500 load
1.3.4.2
COM Receiver Specifications
Characteristics
Specifications
Classes
C and E
Frequency Range
118.000 to 136.975 MHz, 25 kHz channel spacing
118.000 to 136.992 MHz, 8.33 kHz channel spacing
Headset Audio Output
100 mW minimum into a 500 load
Audio Response
Less than 6 dB of variation between 350 and 2500 Hz.
Audio Distortion
Less than 5% at rated output power
AGC Characteristics
Less than 3 dB of variation in the audio output from -93 to -13
dBm (power absorbed by a 50 load)
Sensitivity
SINAD on all channels is greater than 6 dB when the RF level is
2 uV (hard) or -107 dBm (power absorbed by a 50 load)
modulated 30% at 1000 Hz at rated audio output power
Squelch
Automatic squelch with manual override
Selectivity
6 dB BW is greater than +7 kHz for 25 kHz channeling.
60 dB BW is less than ±22 kHz for 25 kHz channeling.
6 dB BW is greater than ±3.5 kHz for 8.33 kHz channeling.
60 dB BW is less than ±7.37 kHz for 8.33 kHz channeling.