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[IRCA] HDSDR - distorted recordings - and good TA conditions last night
- Subject: [IRCA] HDSDR - distorted recordings - and good TA conditions last night
- From: Aaron Kreider <aaron@xxxxxxxxxxxxxxxxxx>
- Date: Wed, 16 Mar 2016 21:49:35 -0400
- Delivered-to: archive@xxxxxxxxxxxxxxxxxxxx
- Delivered-to: irca@xxxxxxxxxxxxxxxx
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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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