Can I test the system for noisy transmissions?

The test is simple-
Have someone standby with a VHF receiver tuned to the same channel as the aircraft (123.45?), they should be located some distance from the aircraft so that the aircraft noise does not interfere with the ability to listen on the receiver.
DO NOT TURN THE HEADSETS ON for the entire test, this is a test of the radio/aerial/wiring and not the headset microphone
By not having the headsets on the listener will hear what the radio is pushing out over the airways.  Ideally there should be no difference with the engine on or off.

THE TEST PROCEDURE---
Turn the aircraft master switch on and then press and hold the PTT for 4 seconds.  The listener will note the noise he hears on the receiver.
Start the engine and whilst revving the engine up and down through a range of RPM press and hold the PTT for 4 seconds. The listener will note the noise he hears on the receiver.

If there is engine whining noises or crackle you may wish to fit the EQ1 'pi' filter


You may wish to try this test on other systems

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