I guess you could always apply a 1:1 600 Ohm isolation transformer. You can even get one of those at Radio Shack (still). JIM Date: Tue, 24 Jan 2012 13:44:52 -0600 From: kd0eav@gmail.com To: app_rpt-users@ohnosec.org Subject: Re: [App_rpt-users] Noisy Quad PCI audio I've had issues like that before with those VIA boards - it wasn't running the PCI card (it was [past tense] actually an IRLP node)... I never did succeed at eliminating the noise - even swapping the power supply didn't change much. Just having the PC hooked up to the contoller was enough for the noise to appear - I didn't even need to bridge the audio over. 73 - Jeremy, KD0EAV On 01/24/12 13:08, Ron Simpson 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 _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users