Transmitter Specifications; Receiver Specifications - Garmin G3X Touch Installation Manual

21.3 General Specifications
See Table 2-2 for power/current specifications, and
21.3.1 COM Specifications
The GTR 20 transmitter meets the requirements of RTCA DO-186B section 2.3 for a class 4 transmitter.
Characteristic
Microphone Input
Modulation Capability
Modulation
Frequency Range
Frequency Tolerance
Output Power
Duty Cycle
Carrier Noise Level
Stuck Mic Time-Out
Demodulated Audio Distortion
The GTR 20 receiver meets the requirements of RTCA DO-186B section 2.2 for a class C receiver.
Characteristic
Frequency Range
Headset Audio Output
Audio Response
Audio Distortion
Sensitivity
Squelch
190-01115-01
Rev. AC
Table 21-4 Transmitter Specifications
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%.
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.
AM Double sided Emission Designator: 6K00A3E (118 - 136.975 MHz)
118.000 to 136.975 MHz, 25 kHz channel spacing
+/-5 ppm from -20°C to +55°C
10 Watts carrier minimum
20%
At least 35 dB (SNR)
35 seconds time-out, reverts to receive
Less than 25% distortion when the transmitter is at 85% modulation at
350 to 2500 Hz
Table 21-5 Receiver Specifications
118.000 to 136.975 MHz, 25 kHz channel spacing
60 mW minimum into a 150 Ω load
Less than 6 dB of variation between 350 and 2500 Hz
Less than 25% at rated output power
SINAD greater than 6 dB when the RF level is -107 dBm with 30% modulation
Automatic squelch with manual override
G3X/G3X Touch Installation Manual - GTR 20 Installation
Table 2-4 for dimension/weight specifications.
Specification
Specification
Page 21-3