Garmin GPS 400W, GNC 420W Installation Manual page 18

1.4.4 COM Transceiver Specifications (GNC 420W and GNS 430W Only) **
Audio Output
Audio Response
Audio Distortion
AGC Characteristics
Sensitivity
Squelch
Selectivity
Spurious Response
Modulation
Frequency Band
Transmitting Power
Transmitter Duty Cycle
Modulation Capability
Carrier Noise Level
Frequency Stability
Demodulated Audio Distortion
Sidetone
Demodulated Audio Response
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, and
with a nominal 50 ohm resistive load at the antenna connector.
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Rev. E
100 mW minimum into a 500 Ω load.
Less than 6 dB of variation between 350 and 2500 Hz.
The distortion in the receiver audio output shall not exceed
15% at all levels up to 100 mW.
The audio output will not vary by more than 6 dB when the
level of the RF input signal, modulated 30% at 1000 Hz, is
varied from 5 μV to 450,000 μV.
(S+N)/N on all channels shall be greater than 6 dB when the
RF level is 2 μV (hard) modulated 30% at 1000 Hz at rated
audio.
2 μv ±6 dB for 25 kHz channels.
3 μv ±6 dB for 8.33 kHz channels.
6 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.
Greater than 85 dB.
AM Double sided, Emission Designator 6K00A3E
118.00 to 136.99 MHz
25 kHz and 8.33 kHz channel spacing
GNS 420W, GNS 430W
10 watts minimum, 15 watts maximum
GNS 420AW, GNS 430W
16 watts minimum, 20 watts maximum
Recommended 10% maximum.
The modulation is not less than 70% and not greater than
98% with a standard modulator signal applied to the
transmitter.
At least 45 dB (S+N)/N.
0.0005%
Less than 10% distortion when the transmitter is modulated at
least 70%.
1.4 V into a 500 Ω load when the transmitter is modulated
RMS
at least 70%.
Less than 6 dB when the audio input frequency is varied from
350 to 2500 Hz.
400W Series Installation Manual
190-00356-02