[hpsdr] TAPR Hermes - Noise on Audio Out

[Kjell Karlsen]

Hi Ron.

I may have observed the same some time ago but now I do not have this  
noise anymore. It went away when I used the noise blanker.

It may be dependent of what version of PowerSDR you use. With the latest  
versions there is no noise.

73, Kjell





På Wed, 21 Nov 2012 06:11:06 +0100, skrev Ron Nelson  
<ronelson99 at gmail.com>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi,
>
> I have my TAPR Hermes working using PowerSDR, however, there is loud  
> noise on the audio output independent of the RX input. The noise  
> consists of  sharp spikes, 2 V p-p with a period of about 2.8 ms.  I do  
> hear stations with an antenna connected, but the noise level is  
> comparable to audio from strong stations.
>
> I think I have ruled out external local sources:
>
> Tried DC power from a switching power supply, a regulated lab bench  
> supply and a battery.
>
> Connected Ethernet to PC directly and via a Linksys router.
>
> Tested with and without antennas. Always used 50 Ohm dummy load on Tx  
> out.
>
> Tried two locations and turned off all other PCs and devices nearby.
>
> Put in the Anan case and grounded it. None of the above made any change  
> to the noise.
>
> Suggestions please?
>
> 73
> Ron NR5ON
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