USA-spec PA15 - high pitched sound

I just installed the USA-Spec PA 15 & hooked in my XM radio. When I play the XM radio I get a high pitched constant sound. It gets worse when I plug in my IPOD at the same time. I have a good quality monster cable going to my XM. Any thoughts?

 

That sucks! I am not experienced with the USA-Spec device but I believe it has a set of dip switches. Have you verified that they are set properly? If so, maybe you just got a bad one...

 

Yeah - the dip switches are pretty basic. 1 is to turn on/off the aux input & the other 3 relate to the radio depending on what toyota you have. The taco setting is to have all 3 on. My XM is a portable - TAO that I plug in/take out. I'm going to try my wife's portable delphi & see if it makes a difference...hopefully, the antenna cable matches.

 

The whine is probably from an improperly isolated ground loop... do you notice it change pitch with engine revs? I've had similar problems on my VW with the USA-Spec adapter and even on my home stereo when connected to a computer. The solution is to use a ground loop isolator, easily bought from RS:

http://www.radioshack.com/sm-buy-the-ground-loop-isolator-on-http-wwwradioshackcom--pi-2062214.html

Good luck!

 

Thanks to all for the input. I found the problem...my XM radio. The charger was causing the whine - the battery is dead and something's not right with the power. My wife's XM radio worked perfectly with it. At least now I know what the solution is.