squelch problem..?

[lowleveljet]

what is the issue when you are transmitting and receiving properly, but can't hear yourself speaking when you push down the mic button? that is, you are getting through on the radio, you just can't hear yourself. even when speaking over the intercom i can hear myself, just not while transmitting. this has happened a few times, where everything was working fine, but i end up screaming through the mic without realizing it because i can't hear myself.

[FlaplessDork]

Damn Pilots. Always wanting to hear themselves speak.

[The Old Fogducker]

The function is called "sidetone" and here is an explanation of "the hows and why's" of how it works.

Telephony

In telephony, sidetone is the effect of sound that is picked up by the telephone's mouthpiece and introduced (at low level) into the earpiece of the same handset, acting as feedback. .....

Without sidetone, users do not hear their own voice in the earpiece, and may think the phone is not working. In response, they raise their voice level until it can be heard. Too much sidetone causes users to hear their own voice loudly. They are likely to feel uncomfortable and lower the level of their voice to a level where transmission of intelligence is harmed.


Radiotelegraphy

Sidetone is also used on voice radio equipment to give the radio operator confidence that they are transmitting over the radio. The sidetone audio is typically derived from the transmit audio circuitry.

There is a circuit that provides sidetone back to the headphone jack and usually, an internal volume control to adjust sidetone level ... it may be set way too low. If not, then suspect component failure in the sidetone circuit which will require some time on the bench to troubleshoot and repair.

The Old Fogducker

[xsbank]

Most radios have an adjustment for sidetone somewhere outside, on the side or rear of the box. It is usually marked. Unless you're using Collins Pro Line 4 then you need to be an avionics genius, just to find/identify the boxes!