Hello Flexworld :)

I updated to PSDR 2.0.16 a few days ago. No promblems while install and
PSDR really works great. The comments on the reflector going the same
way. Thanks to all at Flex-Radio!

But.. My Flex 5000A produces heavy noise while switching from TX to RX.
It is not a new problem, I wailed about it long time ago on this list.

Specially in CW with tight filters and weak signals, when i pull up the
volume to hear a little better, this switching sound kills ears! Working
36hr in the upcoming CQWW CW seems to be absolute impossible for me. So
i tried again to tune my audio settings in context to my DSP buffer
settings. Watching the noise in my scope/panascope view.

A picture of noise with 96/2048 and 2048/2048 CWbuffer: http://d.pr/dRrs

My results. Audio 192/2048 works better than 96 or 48. Reducing the
audio buffer size makes no difference.

While changing the audio settings i switched the DSP CW settings in a
small test series. So i found DSP CW RX buffer 2048 and TX 1024 works
best for me. 80% TX>RX with no noise, the other 20% with 50% lower
noise. Every other combination is absolutely not useful. It is not only
a CW issue, same happens in SSB modes..

I hope that this behavior is further on the flex-radio todo list. I
could not believe that all operators live with this clicks/thumps?!?
Could this be a serious problem in my hardware?

Best '73 de Tom, DF2LH



-- Windows 7 32Bit, 2*2,6 GHz AMD X2 64, 2GB RAM on Asrock
   max DPC over 24 Hours in contest: 217 with Ti Firewire PCI card



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