In October I used a factory 6ft RCA > mini-plug cable to record some FM broadcasts. Sounded really good but I noticed a constant but inaudible high frequency was picked up which I've seen before and most likely was picked up from a TV near my stereo. I tried the cable alone and then another factory made extension to get the recorder further away from TV and power sources but that didn't make a difference (didn't really think it would)
I don't do this often and for the moment can't easily relocate my receiver or TV. I'm wondering if a shielded RCA > mini-plug cable might prevent this?