190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 19-3
19.3 General Specifications
See Table 2-2 for power/current specifications, and Table 2-4 for dimension/weight specifications.
19.3.1 COM Specifications
The GTR 20 transmitter meets the requirements of RTCA DO-186B section 2.3 for a class 4 transmitter.
The GTR 20 receiver meets the requirements of RTCA DO-186B section 2.2 for a class C receiver.
Table 19-4 Transmitter Specifications
Characteristic Specification
Microphone Input
Two inputs, standard carbon or dynamic mic with integrated preamp.
The GTR 20 provides a 150 Ω AC input impedance and supplies the
microphone with an 11 V bias through 470 Ω +/- 5%.
Modulation Capability
85% with 150 to 1500 mVRMS microphone input at 1000 Hz. Range
can be extended from 20 mVrms to 2500 mVrms with mic gain
adjustment.
Modulation
AM Double sided Emission Designator: 6K00A3E (118 - 136.975 MHz)
Frequency Range 118.000 to 136.975 MHz, 25 kHz channel spacing
Frequency Tolerance +/-5 ppm from -20°C to +55°C
Output Power 10 Watts carrier minimum
Duty Cycle 20%
Carrier Noise Level At least 35 dB (SNR)
Stuck Mic Time-Out 35 seconds time-out, reverts to receive
Demodulated Audio Distortion
Less than 25% distortion when the transmitter is at 85% modulation at
350 to 2500 Hz
Table 19-5 Receiver Specifications
Characteristic Specification
Frequency Range 118.000 to 136.975 MHz, 25 kHz channel spacing
Headset Audio Output 60 mW minimum into a 150 Ω load
Audio Response Less than 6 dB of variation between 350 and 2500 Hz
Audio Distortion Less than 25% at rated output power
Sensitivity
SINAD greater than 6 dB when the RF level is -107 dBm with 30% modulation
Squelch Automatic squelch with manual override
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