TX56/56A and TX57/57A Installation Manual
5 April 2022
01776-00-01
Issue AD
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Trig Avionics
Page 27
Dual Watch Audio
When using the dual watch function, the TX56 will route audio received on the
primary channel to the centre of both headphones. Audio received on the
secondary channel will be quieter and routed toward the right of the
headphones.
5.4.7
Mono Wiring Considerations
The TX56 audio wiring can be connected to suit a mono headphone
installation. To do this, you must short the left and right signal wires together
at the TX56 end of the loom. This will have the effect of placing all audio in
the centre of the connected headphones and provides the correct level.
This may be relevant when replacing a previous mono Nav/Com where you
wish to utilise the existing wiring and mono headset jacks.
5.4.8
Audio Wiring
All wires carrying audio signals should be wired using 22 AWG shielded cable
to MIL-C-27500 or equivalent. Mono audio signals should use 2 core shielded
cable and stereo signals should use 3 core shielded cable. One core wire
within each shielded cable should be connected to ground; the cable shield
should not be used to carry the audio ground signals.
The cable shield should be connected to ground at the TX56 end only. Do not
connect the shield at both ends of the cable to avoid a ground loop which can
increase interference effects.
When terminating shielded cable it is recommended to cut away the cable
insulation to expose the cable shield. At the end of the cable, strip the
insulation and shield back at least 90mm. Trim the audio signal wires back to
30mm, keeping the signal ground wire at least 90mm in length.
Содержание TX56
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