ground isolation loops

[Elfmaze]

We were out riding with our Starcom intercom and I tried pluging my phone into the bikes power and audio in so I could hear GPS.   Nasty ground loop. 

Anyone know how to clean up the audio coming thru a charging device?

[B.D.F.]

Yep, buy an isolated audio cable. Starcom sells them (as well as others) and while they are expensive, they do work.

Another method would be to connect to the Starcom using a Bluetooth device. I have one on my Starcom and my wife uses it with her cell phone with good success. Unfortunately the Bluetooth modules are even more expensive than the isolated audio cable- at least the new ones are true stereo though.

Brian

We were out riding with our Starcom intercom and I tried pluging my phone into the bikes power and audio in so I could hear GPS.   Nasty ground loop. 

Anyone know how to clean up the audio coming thru a charging device?

[Stasch]

I used one of these: 
LINKY TO: Ground Loop Isolator Hum Noise Filter for IPOD MP3

Or search for: 'Ground Loop Isolator Hum Noise Filter for IPOD MP3'

Real cheap, needed 2 of them, one for GPS, one for . . . . not sure now, but needed for any bike powered sound device.

I think I paid about $10 - $12 - now they're around $8.

But much more frugal than the MFG's options (Autocom) at around $80 at the time.

Worked great.

Edited to add: Just remembered - 2nd item was OEM radio / tape player in a Kawasaki Voyager.