190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. F Page 1-4
1.4 COM Specifications
Table 1-4 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 +/-2 ppm from -40°C to +70°C
Output power
10 watt mode: 10 watts minimum
16 watt mode: 16 watts minimum
Duty cycle
10 W: 100%
16 W: 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
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