Intercom noise at music inputs.

[sshae]

Upon firing up my panel for the first time I found I have a noise issue to resolve.

I have an ipod wired to the music inputs of the SV-INTERCOM-2S.  It works perfectly when not charging, but emits a "squeal" type noise in the headphones when the charger is connected.

I have tried:
[list bull-blackball][*] Both cheap and expensive (Stienair) USB power ports.

[*] The 120 v charger that came with the Ipod, and I get 60 hz noise with that.
[*] A different ipod.
[*] Removing the ipod from the panel, and distance does not have an effect.
[*] Connecting the ipod to the front panel jack on the intercom, and that seems to work.  I went through a lot of pain to keep all the wires behind the panel and have muting inputs, so my first desire would be to get the rear inputs working.[/list]
Any thoughts?

 

[Raymo]

My response won't be much help but I feed music into the front intercom jack from my iPhone, which also charges from a Steinair USB charge port. No issues with noise.

Sounds like your issue is related to the wiring into the back of the intercom. Are you using shielded wire?

 

[n456ts]

I would suggest trying an audio ground loop isolator in between the intercom and the iPod. It's only $8.99 on Amazon.
http://a.co/d/8u7RBvJ

 

[sshae]

N456TS - The ground loop isolator was the answer!!

I had actually ordered the exact unit you linked to and was able to try it out last night.  Resulted in perfect audio.