RF interference

Posted by: Marksnaim on 15 April 2017

A new one tonight. Sounds like Japanese!! I only usually suffer from breakthrough in the late evening and then it's usually east european so Radio Tokyo is a bit of a novelty. 

Posted on: 15 April 2017 by djh1697

Which equipment is it coming through on? Ferrite rings might work ?

Posted on: 15 April 2017 by Marksnaim

Superline. Going to wait until I relocate the equipment in a few months. If that doesn't cure it then I might try more drastic measures. It doesn't affect the actual music just noticeable in between.

Posted on: 16 April 2017 by Richard Dane

What plugs do you have fitted to the Superline?  Any capacitance added?

Posted on: 16 April 2017 by Marksnaim

453R and no capacitance plug.

Posted on: 16 April 2017 by Richard Dane

Try a little capacitance.

Posted on: 16 April 2017 by Huge

Technically speaking, when you can hear a radio station, that's called RF breakthrough rather than RF interference.  Interference causes weird sounds or 'mush' in the audio, nothing intelligible.

Posted on: 16 April 2017 by christoph
Richard Dane posted:

Try a little capacitance.

That works, do it

Posted on: 16 April 2017 by Steve O

How much is a little Richard? I assume start with the lowest and work up?

Regards,

Steve O.

Posted on: 16 April 2017 by Richard Dane

Yup, start at the smallest value. 

Posted on: 16 April 2017 by yeti42

I experimented with the supplied cap plugs when I had this problem. The highest didn't comepleetly cure it and 1nF was nearly as good, enough to make it ignorable, finished with 470pf (at Steve Hopkins suggestion) which was enough and with a 17D3 and 470R loading gave better sound than no cap plug so I kept it in place even when a move to Fraim (from a steel and mdf rack) cured the problem.