Ivory Bush VHF90

[Mark R]

My understanding of modulation hum is that it isnt the mains lead acting as an aerial and picking up etc. But rather it acting as a transmitting aerial, radiating stray RF or IF (well this would go straight thru unless there was an IF trap) modulated with 50 or 100 Hz . This goes around and gets picked up by the aerial to the set and comes out the speaker as HUM!!

Gary

Interesting thoughts Gary, Has anyone tested this theory? Or could it be other appliances plugged in around the set on test, for example test gear or the the TV/whatever is near the radio at the time of listening?
Perhaps just the unshielded wiring of the humble abode coupled with wireless internet, wifi and TV providers?

any thoughts?

cheers Mark

PS, listening to a Hacker Mayflower II on classic FM with no hum!