Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: Classified on January 03, 2021, 10:50:29 AM

Title: Hearing Radio Station
Post by: Classified on January 03, 2021, 10:50:29 AM

I am able to faintly but noticeably hear music or talking that is not coming from my source, it still exists when the crack is disconnected from the source. I just moved into a new building and I'm guessing it's picking up radio waves from somewhere because this was not a problem before I moved. I have tried moving my phone to another room and I can still hear it. Is there any way to eliminate this?

Edit: I found that unplugging the RCA cables removed the station noise, so I'm guessing it's the cables acting as an antenna (using monoprice RCA cables), is there a solution to this?

Title: Re: Hearing Radio Station
Post by: Deke609 on January 03, 2021, 10:58:21 AM

There was a mod for the Quickie for dealing with a similar problem. IIRC, it involved installing a tiny capacitor or two to shunt radio station frequencies  to ground. PB or PJ can tell you if something similar would work for the Crack.

You could also try lining the interior of the base with copper foil tape. That stuff provides some RFI protection.

cheers, Derek

Title: Re: Hearing Radio Station
Post by: Paul Birkeland on January 03, 2021, 02:42:10 PM

Install a Z5U cap (0.1uF or 1uF, whatever is handy) between the ground lug of the right RCA jack and 22L.  Let us know if that takes care of the issue.