Linrad mailinglist Digest #406
1) Linrad-02.39
by Leif Asbrink <leif@xxxxxxxxxx>
2) Re: Linrad-02.39 and Linrad-MAP65
by Roger Rehr <w3sz@xxxxxxxxxxx>
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Date: Mon, 1 Oct 2007 01:22:34 +0200
From: Leif Asbrink <leif@xxxxxxxxxx>
Subject: Linrad-02.39
Message-Id: <20071001012234.98484234.leif@xxxxxxxxxx>
Content-Type: text/plain; charset=US-ASCII
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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: <20070930213003.mkuokc6eo88s8wkk@xxxxxxxxxxxxx>
Date: Sun, 30 Sep 2007 21:30:03 -0400
From: Roger Rehr <w3sz@xxxxxxxxxxx>
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.
Today I bought two Netgear FA311 v2 32 bit PCI adapter 10/100 Mbps
Fast Ethernet cards and installed one in each computer. I tested
them to make sure they worked OK with the local network and they do;
I could see the other computers on the network and access the
Internet through them. But when I hook the two computers together
via these cards and the crossover cable, it is as though there is no
connection. The Netgear network card LEDs stay 'off' instead of
turning green, and the computers each say "Network Cable Unplugged"
and Linrad and MAP65 do not communicate! SO AVOID THESE NETWORK
CARDS if you plan to use them in this fashion. I solved the problem
by using these new cards to access the internet from each computer,
and I connect the two computers together via the buit-in ethernet
ports that work fine with the crossover cable, but I'd still prefer
cards that work with the crossover cable. Why the built-in ethernet
ports work and these cards do not for this purpose I do not know.
It may be that having "Line Speed" set to auto doesn't work with
these cards when doing crossover cable; I will check that at some
point. I found the following quote on the net "Some newer fancy
autonegotiaton cards may not work on a crossover cable though", so I
am hoping that setting line speed to either 10 or 100 and not 'auto'
may fix the problem...
[ http://www.yolinux.com/HOWTO/Ethernet-HOWTO.html and search the
page for "autonegotiation"]
Have a great week all, and
73,
W3SZ
Roger Rehr
http://www.nitehawk.com/w3sz
Quoting Leif Asbrink <leif@xxxxxxxxxx>:
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
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Roger Rehr
W3SZ
http://www.nitehawk.com/w3sz