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Page 2-6
GNS 400W Series Maintenance Manual
Rev. A
190-00356-05
Table 2-4. COMM Transceiver Specifications (GNC 420W and GNS 430W Only)
Audio Output
100 mW minimum into a 500 ohm 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
exceed 15% at all levels up to 100 mW.
AGC Characteristics
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
μ
V to 450,000
μ
V.
Sensitivity
(S+N)/N on all channels shall be greater than 6 dB
when the RF level is 2
μ
V (hard) modulated 30% at
1000 Hz at rated audio.
Squelch
2
μ
v ± 6 dB for 25 kHz channels. 3
μ
v ± 6 dB for 8.33
kHz channels.
Selectivity
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.
Spurious Response
Greater than 85 dB.
Modulation
AM double sided, Emission Designator 6K00A3E
Frequency Band
118.00 to 136.99 MHz 25 kHz and 8.33 kHz channel
spacing
Transmitting Power
GNS 420W, GNS 430W 10 watts minimum, 15 watts
maximum GNS 420AW, GNS 430W 16 watts minimum,
20 watts maximum
Transmitter Duty Cycle
Recommended 10% maximum.
Modulation Capability
The modulation is not less than 70% and not greater
than 98% with a standard modulator signal applied to
the transmitter.
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
modulated at least 70%.
Sidetone
1.4 Vrms into a 500 ohm load when the transmitter is
modulated at least 70%.
Demodulated Audio Response
Less than 6 dB when the audio input frequency is varied
from 350 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 V dc or 27.5 V dc, as
applicable, and with a nominal 50 ohm resistive load at the antenna connector.