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Leif Asbrink | 1 Oct 01:22

Linrad-02.39

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
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Roger Rehr | 1 Oct 03:30
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Re: Linrad-02.39 and Linrad-MAP65

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
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f6dro | 1 Oct 07:09
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Re: Linrad-02.39 and Linrad-MAP65

Hello all ,

I think that if we need LINRAD and MAP65 to gain popularity , we need some 
RX hardware. Something less expensive than Leif's hardware , but better than 
Time Machine , anybody working on this?

73 Dom 

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Leif Asbrink | 1 Oct 13:37

Re: Linrad-02.39 and Linrad-MAP65

Hi Roger,

> 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!
This worries me a lot. I know you mentioned this before and I have
been worried ever since. It would be interesting to have a file
that contains an example. It should last at least 4 minutes so one
can see the 1 minute on/off pattern of JT65 to distinguish from all 
the spurs that are likely to be present.

> 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?

I really do not know, but I have a feeling that this has to be done
outside Linrad with a network tool of some kind. I hope someone else
will know better:-)

73

Leif / SM5BSZ

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Dave Blaschke | 2 Oct 02:15

SDR-IQ

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 <leif@...>
>  2) Re: Linrad-02.39 and Linrad-MAP65
>     by Roger Rehr <w3sz@...>
>
>This digest is sent to you because you are subscribed to
>   the mailing list <linrad@...>.
>To unsubscribe, E-mail to: <linrad-off@...>
>To switch to the FEED mode, E-mail to <linrad-feed@...>
>Send administrative queries to  <linrad-request@...>
>
>
>Date: Mon, 1 Oct 2007 01:22:34 +0200
>From: Leif Asbrink <leif@...>
>Subject: Linrad-02.39
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Roger Rehr | 2 Oct 03:05
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Re: Linrad-02.39 and Linrad-MAP65

Hi Leif,

I would not worry.  I assume that it means that I haven't set my 
parameters optimally, or that I have so many birdies that they are 
hiding under a birdie or mistaken for one.  I just thought it was 
'cool'; kind of like finding a station when tuning an old fashioned 
radio with knobs on a band that you thought was 'dead' ;)

I have had such good experience with Linrad that I have never sat down 
to learn the theory and optimize things for my particular setting.  The 
'defaults' do very well for me, and I just do a little tweaking without 
as much thought as I should put into things.  SO if you must worry, 
worry about my IQ deficiency or my curiosity deficiency and not a 
Linrad deficiency ;)

OK on the second question.  I thought the address of the NIC to be used 
was something easy to change in the Linrad code.  Knowing its not, I 
will delve into how these things are handled by the OS and see what I 
can do [unless someone pipes up with the answer and saves me the 
trouble] ;)

Thanks again for all, and

73,

W3SZ
Roger Rehr
http://www.nitehawk.com/w3sz

Quoting Leif Asbrink <leif@...>:
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Roger Rehr | 2 Oct 03:16
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Re: SDR-IQ

Hi, Dave,

Glad to hear that you got things calibrated.

I have used my SDR-IQ on Linux as well as on windows.

I had a similar problem to what you describe in August when I installed 
a new version of Ubuntu.  THings had worked OK before that.  Here is an 
excerpt from an exchange RObin AA4RC and I had on the SDR-IQ list at 
that time.  It is structured with earliest text at the bottom, newest 
at the top.  Let me know if you need more info:

******start excerpted text******

I should have noted in the email I just posted that I added the line
rmmod ftdi_sio

to the beginning of Leif's file /etc/linrad/usb_sdr14
so that the ftdi_sio driver is automatically removed each time Ubuntu reboots.

73,

W3SZ
Roger Rehr
http://www.nitehawk.com/w3sz

Quoting Robin Cutshaw <aa4rc@...>:

[Hide Quoted Text]
> One of the issues with the IQ is that of USB ID.  It uses the generic ID so
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Leif Asbrink | 2 Oct 12:48

Re: SDR-IQ

Hi Dave,

> 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?
No.

Linrad-02.39 has the automatic spur removal under Windows.
The only difference between Linux and Windows should be that
the transmit routines are not interfaced with the souncard
drivers under Windows. Should you find any other difference
it is a bug that I would like to get information about.
(My guess is that you have an older Linrad version.)

> Also, My LINUX version of Linrad does not recognize my SDR-IQ; has 
> this been fixed?
Hopefully, but you are the only one who could tell me;-)

> Roger: I'm happy to report I have successfully calibrated. The smart 
> noise blanker now works.

Good! You should now be able to set very high gain in the waterfall
to be able to see extremely weak signals provided that you set a long
averaging time for the waterfall (20 lines per minute or less)

73

Leif

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Leif Asbrink | 2 Oct 12:59

Re: SDR-IQ

Hi Roger,

> I had a similar problem to what you describe in August when I installed 
> a new version of Ubuntu.  THings had worked OK before that.  Here is an 
> excerpt from an exchange RObin AA4RC and I had on the SDR-IQ list at 
> that time.  It is structured with earliest text at the bottom, newest 
> at the top.  Let me know if you need more info:
> 
> ******start excerpted text******
> 
> I should have noted in the email I just posted that I added the line
> rmmod ftdi_sio
> 
> to the beginning of Leif's file /etc/linrad/usb_sdr14
> so that the ftdi_sio driver is automatically removed each time Ubuntu reboots.

Seems to be a good idea:-) Starting with Linrad-02.30 
usb_sdr14 will begin like this:

start() {
    echo $"Unloading the ftdi_sio module (if present): "
    rmmod ftdi_sio
    echo $"Loading the ft245 driver: "

73

Leif / SM5BSZ

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Joe Barger | 2 Oct 22:29
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Re: Linrad-02.39


Hi Leif,

Thanks very much for the new calibration and automatic spur removal 
functions.  Fantastic!

>
> There is now a new page about calibration in Linrad:
> http://www.sm5bsz.com/linuxdsp/flat/ampcal.htm

The links to the data files (blinkerinitx.xxx) are broken (but I found them 
anyway :-)).
One small issue, in windows, adfile is selected instead of adfile.txt 
(assuming both are present).

>
> 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

I have not tried the transmit function, but have noticed no problems in 
other functions so far.

I have Linrad and MAP65 running on the same computer under windows.  I am 
using windows remote connect on a second comuter to display and control 
MAP65 as it runs on the first computer.  Amazing combination.  I can now 
copy signals that were buried under local noise before.  Now to get the 
transmit side working and make some EME contacts!

> I am still looking for "interesting" interference situations.
> You may have seen "Reserved for blanker" in the baseband graph.
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Gmane