RFI when using a Shure mic and a Korg recorder

FAQ #3365 Updated October 20, 2017

Question:

I am recording on a KORG D3200 with a SM7B mic, and am picking up RFI(radio/TV station interference.) Suggestions?

Answer:

The sources and causes of RFI are numerous, enough so that there are entire books written on the subject.

As a place to start, go to the link below and use "RFI" as a search term:
shure.com/faq

Also, here are several papers on RFI causes and solutions:
http://www.audiosystemsgroup.com/publish.htm

Shure sells an in-line filter that might help: A15RF

Adding an isolation transformer at the input of the Korg might help: ProCo makes a 1:1 isolation transformer - model ITX.

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A15RF

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