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500 SERIES INSTALLATION MANUAL Page 1-3
P/N 190-00181-02 Rev G
1.3.4 COM Transceiver Specifications (GNS 530 Only) **
Regulatory Compliance TSO-C37d Class 4 & 6* (3 & 5 for “A” models),TSO-C38d
Class C & E, JTSO-2C37e, JTSO-2C38e, RTCA DO-186a
ICAO Annex 10 Volume III (Part II – Voice Communications
Systems) Par. 2.3.3
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 exceed
15% at all levels up to 100 mW.
AGC Characteristics The audio output shall 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.
Sensitivity (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.
Squelch
2 µv ±6 dB for 25 kHz channels.
3 µv ±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.
Transmitter Power At Least 10 Watts*, 16 watts for “A” models.
Transmitter Duty Cycle Recommended 10% maximum.
Modulation Capability The modulation shall not be less than 70% and not greater
than 98% with a standard modulator signal applied to the
transmitter.
Carrier Noise Level Shall be 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 V
RMS
into a 500 Ω load when the transmitter is modulated
at least 70%.
Demodulated Audio Response Shall be 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 Vdc or 27.5 Vdc, as applicable, and with
a nominal 50 ohm resistive load at the antenna connector.