kirk...
now you have the explanation from allyn and heathrow director...and so...when you turn on the radio...turn up the volume...then the squelch till it make that horrible hissing noise..then turn it down a little to where it becomes silent and bobs your uncle....
now you can turn up the volume further if you wish..
sort this out before you start transmitting and causing havoc on he airwaves. it only takes a minute.
you should do this every time you fly especially if someone other than you uses the aircraft.especially in training or club aircraft . i never cease to be amazed at the settings i find radios in...makes me wonder how people can fly and concentrate while listening to such a racket..
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as heathrow says ...its not rocket science. but if you're still in doubt ask an instructor to show you...