
FAA20 Embedded NEXCOM Vocoder
Board Manual
This manual has been prepared for the Federal Aviation Administration.
FA100-00107 (March 2004) – Rev 1.0.0 Page 10
3.3 Audio Connectors
The two 1/8” stereo jacks provide access to the analog audio interface.
The FAA20 only supports a single analog interface, i.e. these jack signals
are wired in common with the associated DIN connector signals.
Although the internal audio amplifier can drive 8-ohm speakers, the
interface is compatible with 600-ohm audio interfaces.
Table 3: Audio Jack Signals
SIGNAL PIN DIR DESCRIPTION
AVI J8 (tip) I Analog Speech Input: The analog voice input signal.
Internally connected to DIN signal pin A29.
Type: single-ended
Impedence: 27K ohms
(compatible with 600-ohm)
Sinusoidal Overload: +3.0 dBm0
Bandwidth: 100 to 3700 Hz
Reference Level: 1 Vpp = 0 dBm0
Nominal Level: -23 dBm0 (avg. speech level)
GND J8 (sleeve) --- Ground.
AVO J9 (tip) O Analog Speech Output: The analog voice output signal.
Internally connected to DIN signal pin C29.
Type: single-ended
Drive Capability: 150 mW (8-ohm load)
Sinusoidal Overload: +3.0 dBm0
Bandwidth: 100 to 3700 Hz
Reference Level: 1 Vpp = 0 dBm0
Nominal Level: -23 dBm0 (avg. speech level)
GND J9 (sleeve) --- Ground.
Note: The audio input jack (J8) is labeled as AUDIO IN. The audio output jack (J9) is labeled as
AUDIO OUT.
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