In a receiver, the local oscillator (they can be two, three or even four such stages) produces a signal which, when mixed with the signal coming from the antenna results in the Intermediate Frequency, where amplification takes place and leads to the detection stage and conversion into the audible part of the frequency spectrum.
Radio Frequency - Local Oscillator Freqency = Intermediate Frequency.
Two conclusions: the LO
signal can fall inside the VHF airband, a typical example would be RF 133.200 - LO 121.500
11.700; the said LO
signal is in the milliVolt range, the LO
) circuit are located inside a metal shield, itself inside the receiver's enclosure. Even with a spectrum analyzer located right next to the receiver, the radiated level of the LO
signal is very weak (in the order of the microVolt, a millionth of 1 Volt)
No chance it can produce anything that might interfere.
On the receiver's performance side in an aircraft environment, unless you are in the cockpit or have a window seat, you will not be able to hear much.