[IRCA] HDSDR - distorted recordings - and good TA conditions last night

[Aaron Kreider <aaron@xxxxxxxxxxxxxxxxxx>]

Last night (March 15th - around 5-6 UTC) there was a great TA MW opening 
which I've seen several times during post-auroral conditions (often is 
short lived for only 30-60 minutes)

So I tried to record it with HDSDR and my QS1R at the 1562500 sample rate.

Unfortunately when I reviewed these recordings they were systematically 
distorted.  You could hear the strongest stations, but the noise floor 
was much higher and there were spurious products all over the dial.  For 
instance, there would be a spurious signal every roughly 2 khz above the 
10 khz channels.  It was like the radio was overloaded or when I put the 
noise blanker on max setting and everything distorts.

So I did some tests and it looks like I can only record up to 625,000 
sample rate without distortion (which unfortunately isn't enough for the 
entire MW dial).

Do any other radios have this problem?  If so is there a possible cure 
for HDSDR?

I've got a very fast cpu 4670k (overclocked to 4.4 ghz), a solid state 
drive, and 16 GB RAM.  So the computer should be able to handle it, but 
maybe it hit a limit?  CPU runs at around 18% when recording (and 
running HDSDR in superwide mode with a waterfall).

I can record a large sample rate with SDRMax IV (the custom QS1R 
software) - but that software's recording and playback features are 
unfriendly and the noiseblanker isn't as effective.

Aaron
QS1R, two Wellbrook loops, Philadelphia PA
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