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<blockquote data-quote="Vipersan" data-source="post: 983559" data-attributes="member: 325666">So ..did a Kent Clark ..put some speakers on it shut my eyes and listened ...There was a background vibration to the white noise that sounded like helicopter blades ...not that loud as to drown everything out ...but nonetheless ..present.No data (hits) displayed on either Jaero ...Shut down SDR# nothing else ...went and made a cuppa ..approx 5 minutes ...then started up SDR# again ..I instantly got hits ...not a huge number but some ...and the helicopter white noise was gone&nbsp; ...just the comforting white noise rush ...pierced occasionally by high pitched data bursts ..So ..is it SDR# causing this I wonder ...the addition of the plugin ....VB cable ...or the PCs integral sound card ..?Who can say ...It may well be tricky to pin down or point a finger ..but I believe this is why the system gradually runs out of steam ..ideas anyone ?The noise I think is caused by a vibration set up in the AGC causing rapidly fluctuating levels though these are not visible in the waterfall ..Could be IF ...AGC ...or AudioI'll check back in about 2 hours to see if the&nbsp; vibrating white noise has returned..</blockquote>

[QUOTE="Vipersan, post: 983559, member: 325666"] So ..did a Kent Clark ..put some speakers on it shut my eyes and listened ... There was a background vibration to the white noise that sounded like helicopter blades ...not that loud as to drown everything out ...but nonetheless ..present. No data (hits) displayed on either Jaero ... Shut down SDR# nothing else ...went and made a cuppa ..approx 5 minutes ...then started up SDR# again .. I instantly got hits ... not a huge number but some ...and the helicopter white noise was gone ...just the comforting white noise rush ...pierced occasionally by high pitched data bursts .. So ..is it SDR# causing this I wonder ...the addition of the plugin ....VB cable ...or the PCs integral sound card ..? Who can say ... It may well be tricky to pin down or point a finger ..but I believe this is why the system gradually runs out of steam .. ideas anyone ? The noise I think is caused by a vibration set up in the AGC causing rapidly fluctuating levels though these are not visible in the waterfall .. Could be IF ...AGC ...or Audio I'll check back in about 2 hours to see if the vibrating white noise has returned.. [/QUOTE]

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