RF interference question on AV system

Trell

Trell

Audioholic Spartan
There are two issues here, which have totally different physics as to causation.

One is electro magnetic induction and the other is Radio Frequency interference.

In the OPs situation, EM is likely to be the far bigger problem.

RF interference from ham radios and commercial AM transmitter is a totally different problem.

RF interference in audio systems, is almost always picked up in the loudspeaker leads and fed back to the high gain circuits through the negative feedback. The solution for that type of RF is to find the frequency of the offending transmitter and design a resonant rejector circuit for the +ve speaker leads of each speaker right at the speaker terminal of the amp or receiver. I have used this successfully on several occasions, including for a member on these forums. I designed built, and sent him the blocking devices.



It worked well for him.

For some reason people have difficulty understanding EMI from RFI and I have trouble understanding that, as the causation and physics of the situation are poles apart.
Who cares? It's a non-issue for everyone except the odd one or two.
 
TLS Guy

TLS Guy

Audioholic Jedi
Who cares? It's a non-issue for everyone except the odd one or two.
You might say that, but I and others over the years have helped people get to the bottom of their humming and buzzing. Ground loops, magnetic induction and RF, have all featured prominently. LED light dimmers and RF interference have been well up the list. These posts are generally the most time consuming.
 
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