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Old 19th Aug 2019, 9:28 pm   #12
PaulR's Avatar
Join Date: Oct 2003
Location: Southport Lancashire, UK.
Posts: 2,127
Default Re: Spitfire AM Transmitter Hum (Buzz)

I had a very similar problem with an sstran transmitter which came on suddenly, presumably due to a fault with a neighbour's SMPS. It made it more or less unusable.

I greatly improved it by putting a class X capacitor inside a 13A plug across the live and neutral terminals. It might be worth trying that. Try a couple in various positions in the house. I also have similar interference on LW but the plugs do not help that for some reason.

I found the solution by chance when I switched on a lamp with a CFL bulb near the set. Here is a youtube video I made at the time
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