<table cellspacing="0" cellpadding="0" border="0"><tr><td valign="top" style="font: inherit;"><p>Ok, I will give that a try. However... with no tx audio connection, that noise is encoded and sent to nodes I connect to. </p>
<p>This noise is sent from node to node with no input. </p>
<p>I will try a different PC.<br><br><br></p>
<p>73,</p>
<p>Ron - N6GKJ<br>
Sent from Yahoo! Mail on Android</p>
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Bryan D. Boyle <bdboyle@bdboyle.com>; <br>
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<app_rpt-users@ohnosec.org>; <br>
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Re: [App_rpt-users] Noisy Quad PCI audio <br>
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Tue, Jan 24, 2012 8:20:36 PM <br>
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<td valign="top" style="font:inherit;">On 1/24/12 2:46 PM, Jim Duuuude wrote:<BR>> <BR>> I guess you could always apply a 1:1 600 Ohm isolation transformer. You can even<BR>> get one of those at Radio Shack (still).<BR><BR>Keeping unbalanced audio or other signal paths clean is such a pain...<BR><BR>Isolation xfmrs are a good thing. If cellphone shack doesn't have them...IIRC Mouser, Digikey, even Broadcast Supply Warehouse, and some ham bits-and-pieces places (there are still a few left...) will. They should NOT be expensive, nor massive (like the old Weco 666 repeater coils...). I bought a box of them a couple years ago when I was building my streaming radio station, and, even between balanced audio sources and my console, I dropped them in on the back of my patch panel...just in case (and the audio chain meets the old FM proof of performance specs, so...).<BR><BR>Basically you are more
prone to have noise issues if you have multiple pieces of equipment where the grounds are at different voltage potentials between different pieces of equipment (like being plugged into different wall outlets or power strips). Don't discount the noise that switching supplies or wall warts can spew onto lines, nor noisy muffin fans on amplifiers (have this problem on a Henry amp right now), florescent lights, HT chargers...the list is long where it could be coming from, not to mention a/d device issues.<BR><BR><BR>-- Bryan<BR>In this world, you must be oh so smart or oh so pleasant.<BR>Well, for years I was smart. I recommend pleasant.<BR>You may quote me.<BR><BR>Sent from my MacBook Pro.<BR>_______________________________________________<BR>App_rpt-users mailing list<BR><a ymailto="mailto:App_rpt-users@ohnosec.org" href="javascript:return">App_rpt-users@ohnosec.org</a><BR><a href="http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users"
target=_blank >http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users</a><BR></td>
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