Com Specifications (Gtn 750 Only) - Garmin GTN 725 Installation Manual

1.3.4

COM Specifications (GTN 750 Only)

1.3.4.1 COM Transmitter Specifications
Classes
Microphone Input
Modulation Capability
Modulation
Frequency Range
Frequency Tolerance
Output Power
Duty Cycle
Carrier Noise Level
Stuck Mic Time-Out
Demodulated Audio Distortion
Sidetone
1.3.4.2 COM Receiver Specifications
Classes
Frequency Range
Headset Audio Output
Speaker Audio Output
Audio Response
Audio Distortion
AGC Characteristics
Sensitivity
Squelch
Selectivity
Page 1-4
Rev. A
3,4,5,6
Two inputs, standard carbon or dynamic mic with integrated
preamp providing minimum 70 mVRMS into 1000 load
85% with 100 to 1000 mVRMS microphone input at 1000 Hz
AM Double sided, Emission Designator 6K00A3E
118.000 to 136.975 MHz, 25 kHz and 8.33 kHz channel spacing
+/-2ppm from -40°C to +70°C
10 Watt Mode: 10 watts minimum
16 Watt Mode: 16 watts minimum
10W: 100%
16W: Recommended 25% (15 seconds on/45 seconds off,
5 seconds on/15 seconds off, etc.)
At least 35 dB (SNR).
35 seconds time-out, reverts to receive
Less than 5% distortion when the transmitter is at 85%
modulation at 350 to 2500 Hz
1.4 Vrms into a 500 load
D and E
118.000 to 136.975 MHz, 25 kHz and 8.33 kHz channel spacing
110 mW minimum into a 500 load
12 watts minimum into a 4 load
Less than 6 dB of variation between 350 and 2500 Hz.
Less than 5% at rated output power
Less than 3 dB of variation in the audio output from -93 to -13
dBm (power absorbed by a 50Ω load)
SINAD on all channels is greater than 6 dB when the RF level is
2 uV (hard) or -107 dBm (power absorbed by a 50Ω load)
modulated 30% at 1000 Hz at rated audio output power
Automatic squelch with manual override
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.
GTN 725/750 TSO Installation Manual
190-01007-02