UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - MW hum - higher frequencies only

Andrew2 · 18th Jun 2021, 1:21 pm

It may be a type of 'modulation hum', where a strong local transmission puts a high level of RF on the mains wiring, causing intermodulation between itself and the 100Hz switching frequency in power supplies etc. I get it badly on our local 1458 kHz station, which is only 2 miles from here and puts in a huge signal here.

18th Jun 2021, 1:21 pm	#4
Andrew2 Nonode Join Date: Mar 2010 Location: Dukinfield, Cheshire, UK. Posts: 2,037	Re: MW hum - higher frequencies only - 200Hz It may be a type of 'modulation hum', where a strong local transmission puts a high level of RF on the mains wiring, causing intermodulation between itself and the 100Hz switching frequency in power supplies etc. I get it badly on our local 1458 kHz station, which is only 2 miles from here and puts in a huge signal here. __________________ Andy G1HBE.