I'm trying to enable the spur reduction, but Enable AFC/Spur/Decode
only allows me to choose 0 or 1, not 2, so I guess the Windows
version of Linrad does not contain this feature; Is this correct?
Also, My LINUX version of Linrad does not recognize my SDR-IQ; has
this been fixed?
Roger: I'm happy to report I have successfully calibrated. The smart
noise blanker now works.
Dave, W5UN
At 03:01 10/1/2007, you wrote:
Linrad mailinglist Digest #406
1) Linrad-02.39
by Leif Asbrink <[EMAIL PROTECTED]>
2) Re: Linrad-02.39 and Linrad-MAP65
by Roger Rehr <[EMAIL PROTECTED]>
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Date: Mon, 1 Oct 2007 01:22:34 +0200
From: Leif Asbrink <[EMAIL PROTECTED]>
Subject: Linrad-02.39
Message-Id: <[EMAIL PROTECTED]>
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Hi All,
Linrad-02.39 can do calibration from recorded files, both .wav files
and files in Linrads own format.
This feature is intended to allow me to receive calibration files from various
hardwares in order to check that the routines work as intended.
There is now a new page about calibration in Linrad:
http://www.sm5bsz.com/linuxdsp/flat/ampcal.htm
An ordinary function generator that produces a square wave can be
used for calibration on HF bands. The link has several calibration
files that you might download to try what happens when you
do different things.
(If your pulse generator is phase stable, the spectrum you will see
on the linrad screen will be sharp lines at the overtones of your
square wave - but that does not affect calibration.)
Linrad-02.39 also has an automatic spur cancellation routine that
can locate hundreds of spurs and place notch filters on them all.
For details, look here:
http://www.sm5bsz.com/linuxdsp/spur/autospur.htm
There are many changes in Linrad since 02-35 which is still
"latest version" on the "Linrad Home Page."
I have not had much feed-back on whether the changes in users.c
and users_tr.c have caused problems or if there have been other
difficulties. Please test Linrad-02.39 and verify that nothing that
was working well before is still ok. I think that the advantages
with 02-39 over 02.35 motivate a change at the "Linrad Home Page",
but I do not want to give problems to newcomers.
I am still looking for "interesting" interference situations.
You may have seen "Reserved for blanker" in the baseband graph.
This is a routine that should help against lightening crashes
on HF bands and perhaps in other situations where interference
pulses are not local and therefore suffer from multi-path
propagation.
Is there NOBODY on this list who ever tries to copy a signal but
has big difficulties due to interference of some kind (or in SSB
has a too low S/N) ???
I am very interested in recordings of marginal "copy" or "no copy"
in CW or SSB. Maybe DSP could improve :-)
73
Leif / SM5BSZ
Message-ID: <[EMAIL PROTECTED]>
Date: Sun, 30 Sep 2007 21:30:03 -0400
From: Roger Rehr <[EMAIL PROTECTED]>
Subject: Re: [linrad] Linrad-02.39 and Linrad-MAP65
Content-Type: text/plain;
charset=ISO-8859-1;
format="flowed"
Hi, Leif,
This looks great! I can't wait to try it all out. The auto spur
removal operating on the 20 m file is impressive.
The explanation pages are very helpful as well.
I only worry about one thing, this request:
"Please test Linrad-02.39 and verify that nothing that was working
well before is still ok".
I hope that I will not be able to verify that ;)
On another note:
I have been playing with Linrad and MAP65 and have made several EME
contacts this way. It is a lot of fun, and truly amazing. MAP65
finds stations that I do not see on the waterfall with my usual
[aggressive] parameters!
I have the two [Linrad and MAP65] computers hooked directly together
with a CAT5 crossover cable, and things work fine. However, if I
don't disconnect the other network card on the Linrad computer from
the network, Linrad also sends the data over the local network,
totally tying it up.
I would like to be able to specify which of the two network cards in
my Linrad computer is the one that Linrad uses to send the data to
the MAP65 computer, as that way I will not tie up my network by
blasting it with the multicast and won't have to disconnect this
computer from the network each time I want to use Linrad and MAP65.
Is doing this as simple as specifying sin_addr [which I found in
network.c} somewhere?
One thing interesting I found playing with Linrad and MAP65
today. The two computers are happy talking to each other with a
CAT5 cable that I remember as being a crossover cable connected
between the original built-in network ports on each computer. That
is the arrangement I used to make the EME contacts.
Toda
