headsets.
In this example, two PTT switches are used. If the Pilot PTT is activated, only the pilot voice is
transmitted and the passenger voice is muted.
If the passenger PTT is activated, only the passenger voice is transmitted and the pilot is
muted.
If both PTT switches are activated at the same time, both pilot and passenger voices are
transmitted.
Variations to the example: Wire only the pilot PTT switch if no passenger PTT is required,
leave the passenger PTT pin unconnected.
Alternative: Connect both pilot and passenger PTT pins together to a single PTT switch. In
this case activation of the switch will transmit both pilot and passenger voices.
Audio signal wiring advice
It is strongly advised to use good quality shielded audio cable. The diagram shows that all
shields are connected on only one side. Shields are never used to conduct signals.
Signal grounds have their own wire inside the shielded cable (you would be using a two core
plus shield cable).
NEVER run the audio output signals together with the microphone signals inside the same
shielded cable. This may result in feedback effects.
Avoid running any audio cable next to cables that may contain interference signals. It is good
wiring practice to run audio cables in their own bundles.
Never run any cables (audio, signal or otherwise) close to the antenna cable.
If using audio and microphone sockets please ensure that these are electrically isolated from
each other as well as from any conduction material such as a panel, metal box, bracket etc. If
the sleeves are not isolated it is likely undesirable audio interference may occur in particular
during transmit.
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