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- Subject: Re: Linrad-02.41
- From: Dave Sublette <arrl.net; k4to@xxxxxxxxxxxxxxxx>
- Date: Mon, 07 Jan 2008 19:17:55 -0500
Is this a windows executable file or Linux?
Leif Asbrink wrote:
> Hello All,
> Today I uploaded Linrad-02.41 at these three places:
> The automatic spur removal is now significantly better.
> It should no longer remove CW signals - but of course
> the algorithms need some fine tuning so I am interested
> in feedback with recordings where it does not work well.
> The AM mode has a new feature. When coh2 is selected,
> the coherent detect I signal goes to one ear while the Q
> signal goes to the other. This is as it has always been.
> For an AM station this means that the AM modulation
> goes to one ear and the FM modulation to the other.
> Strong AM stations tend to have weak FM modulation so the
> FM channel is often very low in volume. The new feature
> is that there are now independent AGC functions for the
> AM and the FM audio channel (derived from the audio signals)
> and therefore both ears have similar soundlevels.
> The FM signal with typically 10 dB more gain allows copying
> of weak stations that have the same frequency as a stronger
> There are also many bug corrections in linrad-02.41.
> There is a DSP challenge at these locations:
> There is a file 20mnoise1.wav (13 megabytes) that was recorded
> by W3SZ on 20 meters. The file has some QRN and a relatively
> weak CW signal that is only about 2 kHz away from 40 dB
> stronger CW signals.
> Many SDR programs can use .wav files for input. I would be
> curious to know how sucessful different programs are in
> making this signal visible in the waterfall and how well
> the loudspeaker output can be copied.
> The challenge is on the automatic spur rempoval page
> because the 20mnoise1 file has many spurs.
> I would appreciate if many of you could make some extra
> testing on Linrad-02.41. The latest stable is now 02.35
> and that is pretty old now. The bugs I introduced with
> the structural changes I had to do to get started with
> the Tx side have made 02.36 to 02.40 somewhat unstable
> (more than usual) but I hope to get the bug reports that
> will allow me to make 02-41 or perhaps 02-42 the latest
> stable version.
> Leif / SM5BSZ
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