Page 1-6 400W Series Installation ManualRev. G 190-00356-021.4.4 COM Transceiver Specifications (GNC 420W and GNS 430W Only) **Audio Output 100 mW minimum into a 500 Ω load.Audio Response Less than 6 dB of variation between 350 and 2500 Hz.Audio Distortion The distortion in the receiver audio output shall not exceed15% at all levels up to 100 mW.AGC CharacteristicsThe audio output will not vary by more than 6 dB when thelevel of the RF input signal, modulated 30% at 1000 Hz, isvaried from 5 μV to 450,000 μV.Sensitivity(S+N)/N on all channels shall be greater than 6 dB when theRF level is 2 μV (hard) modulated 30% at 1000 Hz at ratedaudio.Squelch 2 μv ±6 dB for 25 kHz channels.3 μv ±6 dB for 8.33 kHz channels.Selectivity6 dB BW is greater than ±8 kHz for 25 kHz channeling.60 dB BW is less than ±25 kHz for 25 kHz channeling.6 dB BW is greater than ±2.778 kHz for 8.33 kHz channeling.60 dB BW is less than ±7.37 kHz for 8.33 kHz channeling.Spurious Response Greater than 85 dB.Modulation AM Double sided, Emission Designator 6K00A3EFrequency Band 118.00 to 136.99 MHz25 kHz and 8.33 kHz channel spacingTransmitting PowerGNS 420W, GNS 430W10 watts minimum, 15 watts maximumGNS 420AW, GNS 430W16 watts minimum, 20 watts maximumTransmitter Duty Cycle Recommended 10% maximum.Modulation CapabilityThe modulation is not less than 70% and not greater than98% with a standard modulator signal applied to thetransmitter.Carrier Noise Level At least 45 dB (S+N)/N.Frequency Stability 0.0005%Demodulated Audio Distortion Less than 10% distortion when the transmitter is modulatedat least 70%.Sidetone 1.4 VRMS into a 500 Ω load when the transmitter is modulatedat least 70%.Demodulated Audio Response Less than 6 dB when the audio input frequency is varied from350 to 2500 Hz.* C37d Class 4 & 6 may not provide suitable COM transmit range for some high-altitude aircraft.**Specifications shown apply at nominal input voltages of 13.75 VDC or 27.5 VDC, as applicable, andwith a nominal 50 ohm resistive load at the antenna connector.
