We often have pilots inform us that the microphone is constantly operating and they can hear engine noise in the background. Otherwise the headset works normally.
This is not normally a fault condition, its usually miss operation of the Squelch Control.
The operation of this control is to advance it till the noise just stops. If advanced too far you will need to shout to open the mic again. It just needs to be at the point where noise stops but the mic should open as soon as you speak. If a little too high it will cut off your first word. This can be difficult to achieve in a very noisey cockpit like a Harvard as engine noise can be louder than your voice!
Sometimes the squelch control is on the radio itself or it can be in the Audio panal or Both.
Sometimes they are wired in reverse and you will need to try it in either position to tell.
Just set it to one extreme and then the other. One will give the constant noise condition. This is position to start. then turn slowly till the noise just stops. Then as soon as you speak the mic should open.
If you have very different Mics between Pilot and Co pilot then this can be a problem as the Squelch level will only be correct for one mic.
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