Com Receiverp; Com Transmitterp - Garmin GNS 480 Installation Manaul

General Information
1.3.6 COM Receiver Performance
TSO Compliance........................................... TSO-C38d (RTCA/DO-186, DO-186a)
Class .............................................................. D
Frequency range............................................ 118.000 to 136.975 MHz, 760 channels
Sensitivity...................................................... 1μV (2μV hard) for 6dB S+N/N with 30%
Selectivity...................................................... < 6dB variation at ± 7 kHz, > 60dB at ± 22 kHz
Speaker audio output level ............................ 12 watts into 4Ω, 8 watts into 8Ω
Headphone audio output level....................... 280 mW into 100Ω, 120mW into 500Ω
Distortion ...................................................... < 5% at rated output at 1000 Hz
AGC characteristics ...................................... < 3 dB variation in audio output from 5μV to 100mV
Squelch control ............................................. Automatic squelch with manual override
1.3.7 COM Transmitter Performance
TSO Compliance........................................... TSO-C37d (RTCA/DO-186, DO-186a),
Class .............................................................. 4
Output power................................................. 8 watts minimum carrier at >12 VDC input,
Frequency range............................................ 118.000 to 136.975 MHz, 760 channels
Frequency tolerance ...................................... ±15 ppm from -20°C to +70°C
Microphone input.......................................... Two inputs, standard carbon or dynamic mic with
Modulation capability ................................... 85% with 100mV to 1000mV rms microphone input
Audio frequency distortion ........................... < 10% at 85% modulation at 350 to 2500 Hz
Audio frequency response............................. < 4 dB variation with 350 to 2500 Hz, 85%
Carrier noise level ......................................... > 35 dB down
Sidetone output ............................................. up to 280 mW into 100Ω, 120 mW into 500Ω
Duty cycle: .................................................... 100%
Stuck mic time-out ........................................ 35 second time-out, reverts to receive
1-8
modulation at 1000Hz
input, 15% to 90% modulation
TSO-C128 (RTCA/DO-207)
6 watts minimum at 10 VDC input (transmit is
locked out below 9 volts input)
integrated preamp providing minimum 70mV rms
into 1000Ω load
at 1000 Hz
modulation
560-0982-01 Rev L GNS 480 (CNX80) Installation Manual