Also Check for Ground Loops between chassis connections.
 
And look for DC riding on the audio leads as well.
 
And like Jim said use a 1:1 transformer on the audio leads if you cannot isolate it.

 
--
Thanks in Advance

   Bob Brown, WØNQX

   Kansas City Metro Area

   http://sm0kenet.net

   http://byrg.net

   http://kcdstar.byrg.net
 
   http://w0nqx.blogspot.com

Quis custodiet ipsos custodes?

Its not how many watts you have,
its the SIZE of your watts that matter! -- Johnny Marshall, W0JM-SK

--




On Tue, Jan 24, 2012 at 1:08 PM, Ron Simpson <n6gkj.cm98@yahoo.com> wrote:

Hey guys,

I am running an 800mhz VIA ITX Board and a quad pci card. The board is 2004 vintage. I have a distinct noise on TX audio both through my node and remote base. I have shielded cables to both remotes, I have replace the power supply and greatly reduced the high pitch noise.

An interesting note: the tx audio port is quiet when first booting the node pc. Once asterisk is running the noise returns.

Has anyone seen this before? Do I have a bad main board or did I miss something else..

Thanks for your help!

73,

Ron - N6GKJ


73,

Ron - N6GKJ
Sent from Yahoo! Mail on Android


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