I went chasing something similar last month with a URI. I was experiencing a high pitched whine on TX audio. I had a spare URI so I swapped them and the problem cleared up. I sent the URI back to DMK who replaced it at no charge and they are investigating the source at this time. N5ZUA ----- Original Message ----- From: Ron Simpson To: APP_RPT Mail List Sent: Tuesday, January 24, 2012 1:08 PM Subject: [App_rpt-users] Noisy Quad PCI audio 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