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

Hybrid tellies · 23rd Jun 2021, 9:50 am

I get the same effect where I live. I think it is a mains modulation problem as it only affects stronger signals.
Its bad on the two strongest local signals 882Khz and 909Khz. Its also very bad on the stronger signals on the 6Mhz and 7Mhz short wave bands. It effects radios running on batteries and is the same around the house and reduces in the back garden.
I have done some detective work and found it is worst towards the front of the house and seem to peak at the end of the drive where even 198Khz is affected.

I am wondering if its a UG cable under the pavement and finding its way into the house via the mains wiring.

23rd Jun 2021, 9:50 am	#15
Hybrid tellies Nonode Join Date: Jan 2004 Location: 1966-1976 Coverack in Cornwall and Helston Cornwall. 1976-present Bristol/Bath area. Posts: 2,967	Re: MW hum - higher frequencies only - 200Hz I get the same effect where I live. I think it is a mains modulation problem as it only affects stronger signals. Its bad on the two strongest local signals 882Khz and 909Khz. Its also very bad on the stronger signals on the 6Mhz and 7Mhz short wave bands. It effects radios running on batteries and is the same around the house and reduces in the back garden. I have done some detective work and found it is worst towards the front of the house and seem to peak at the end of the drive where even 198Khz is affected. I am wondering if its a UG cable under the pavement and finding its way into the house via the mains wiring. __________________ Simon BVWS member