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Leif Asbrink | 10 Nov 21:54

Re: /dev device configuration

Hi Dan,


*



> What are the devices and what are the configuration to support linrad?


Any linux system should be fine. You need a working sound system,
ALSA or OSS to get the devices needed for soundcard input.
Linrad comes as source code so you need the compilers and header
files to use GCC. You also need nasm for the routines in
assembly code.

type make to get instructions on how to generate devices for
SDR-14, SDR-IQ and svgalib. To generate devices your system
must have linux-headers installed for the running kernel.

Under Windows you just need properly installed sound. If
you want SDR-14 or SDR-IQ you also need the normal dll files
for them.

73

Leif

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Joe Taylor | 10 Nov 14:22
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Re: MAP65 compiling

Hi Alberto and all,

Alberto E. Zagni (I2KBD) wrote:

> I have just a couple of questions about current MAP65 compiling status:
> - Is MAP65 currently only working on Windows platform?

MAP65 runs under Windows and Linux.  A packaged executable (version 0.8, 
r502) is available on the WSJT Home Page for Windows.  You must compile 
it yourself for Linux, from the source code.

> - Did you cross compile MAP65.EXE under Linux or directly on Win?

I compile the Windows executable under Windows.  My development setup 
uses the Microsoft VC6 and Compaq Visual Fortran compilers on Windows. 
These compilers are somewhat dated and not widely available, and it 
would be good to convert to using the GNU compilers, either directly on 
Windows or cross-compiling under Linux.  I have not yet done this.

> - What's your plan for a (beta) release of source code to play with?

The MAP65 source code has been freely available for nearly a year, as 
the program develops.  It is located in the same Berlios repository as 
WSJT.  The easiest was to download the full source code for MAP65 is to 
install the program Subversion and then type

svn co https://svn.berlios.de/svnroot/repos/wsjt/branches/map65

at a command prompt.

> After some work, with help from Roger W3SZ I have been successful to 
> compile WSJT598 on Ubuntu 7.10 and I would like to do the same for 
> MAP65, since I am planning to make some experiments on 6m JT65a.

You should know that the present MAP65 code uses only the JT65B mode.

> Just for your knowledge, next month the Ciao Radio H102 direct sampling 
> receiver with dual parallel input should be available, and I am curious 
> to see if it can be used for dual polarization EME work.
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Alberto E. Zagni | 10 Nov 09:49
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MAP65 compiling

Dear Joe,
I have just a couple of questions about current MAP65 compiling status:
- Is MAP65 currently only working on Windows platform?
- Did you cross compile MAP65.EXE under Linux or directly on Win?
- What's your plan for a (beta) release of source code to play with?
After some work, with help from Roger W3SZ I have been successful to compile 
WSJT598 on Ubuntu 7.10 and I would like to do the same for MAP65, since I am 
planning to make some experiments on 6m JT65a.
Just for your knowledge, next month the Ciao Radio H102 direct sampling 
receiver with dual parallel input should be available, and I am curious to 
see if it can be used for dual polarization EME work.

Many thanks and 73s
Alberto I2KBD

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f6dro | 9 Nov 19:14
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sm7ufw mail?

Helo ,

the sm7ufw mail ( wse ) niklas@... is bouncing , any valid e mail 
pse?
73 Dom/F6DRO 

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Dan Sawyer | 6 Nov 04:13
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/dev device configuration

All,

What are the devices and what are the configuration to support linrad?

Thanks - Dan

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Leif Asbrink | 5 Nov 23:22

Linrad-02.40

Hello All,

Linrad-02.40 can now be downloaded from
http://www.sm5bsz.com/linuxdsp/linroot.htm
with mirrors at
http://g7rau.demon.co.uk/sm5bsz/linuxdsp/linroot.htm
and
http://nitehawk.com/sm5bsz/linuxdsp/linroot.htm

I will leave home tomorrow for one month, perhaps
with occasional E-mail access.

73

Leif / SM5BSZ

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Leif Asbrink | 3 Nov 15:02

Re: sound card requirements?

Hi Dan,


*



> What is the preferred architecture for a linrad sound card?

There is no preferred architecture for the soundcrd.

First of all, Linrad is not designed for any particular
hardware, it is intended to fit anything that can transfer
digital data into a PC with Intel 86 architecture.

In a longer time scale, this will be entirely digital units
like the SDR-IQ and SDR-14 (which work with Linrad) but 
in the near future various converter schemes will be the 
most common radio hardware for Linrad.

There are two choices, the filter method, like in an ordinary
SSB transceiver, where you feed a single audio signal into
a soundcard for a single RF channel. Here is some info on
my first system of that type:
http://www.sm5bsz.com/pcdsp/hware.htm (and links on it)
At that time the "standard" was the Soundblaster 16 soundcard.
With this kind of hardware it is probably ok to use any
soundcard because the soundcard is protected from
out-of-band signals by the filter.

One can also use the phasing method, 'direct conversion', 
and feed two audio signals into the soundcard for each 
RF channel. Soundcards that do not have proper anti-alias
filters are useless in this context. I have never seen one
myself but I have read about them. Any 'normal' soundcard
will do the sampling at a high multiple of the output
sampling speed (64 times higher for example) Then the alias
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Leif Asbrink | 3 Nov 14:29

Re: Linrad-02.39

Hello Francesco and Roger,

> Hello Leif i guess that Ermanno, IK7EZN has already tolt you, regarding the
> bug that i found on last 02.39 release.
> It's a minor bug, because all the rest seems to work properly.
> When i try to change the freq. trough the arrows all crashes.
> Otherwise if i do it, just writing by hand all is ok.
I do not remember when I corrected this (and for what reason)
but this bug is not present in the current 02.40pre version
that Ermanno just tested.

I attach my response to Ermannos test report because I will not
have the time to fix 2) and the inconvenience of 3) will
be present in Linrad-02.40 which I will upload before I 
leave.

73

Leif

-------------------------------------------------------------
Hi Ermanno,

> 1- The change of frequency is OK with Linrad-pre40 in Windows and Linux.
Good:-)

> 2- In windows has disappared the choise 4 from radio menu' (see immage)
Oooh! I changed the way the soundcard is opened when 16 bit
input is selected to allow use under Windows Vista.

Please try to open a second device to get four audio channels.
Please, try also to open in 32 bit format - then it should be 
as before.

I can automate the open process, but I need someone who has Vista
to verify. No time before I leave.
(Continue reading)

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Leif Asbrink | 3 Oct 23:27

Re: Linrad-02.39

Hi Joe,

> Another problem is the files are probably low bandwidth, 3-4 KHz audio 
> files.  And almost certainly uncalibrated.
Well, low bandwidth makes them useless, but there is a lot of
wideband hardware out there now. SDR_14, SDR-IQ, SDR-1000, softrock
and many more. People should have files at 48 kHz bandwidth at
least even though they might hesitate to upload such files to
the Internet because of the size.

> > With four softrocks you would need 8 analog inputs so a Delta44 would be
> > inadequate. There is the Delta 8?, an 8-channel version.
> > The hardware we should look for is something using a good VHF-sampling
> > A/D like the LTC
> 
> I believe it is possible to sync two D44s together, but I haven't looked 
> into it. 
I have no idea, but they sell Delta 88 (or whatever the name is
and that is already 8 channels)

> The HPSDR Mercury board should be interesting when it becomes 
> available (http://hpsdr.org/wiki/index.php?title=MERCURY).

I think we will have to wait for a couple of generations.
All the decimation steps have to be synchronized, and the bandwidth
will become pretty small if one goes for 4 or more channels.
I would like a similar design, but designed for multichannel from
start and with much more bandwidth.

73

Leif

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Joe Barger | 3 Oct 03:12
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Re: Linrad-02.39

Hi Leif,

> The problem (to me) is that low banders record their data on un-calibrated
> systems and that may cause the problem to look more difficult than it
> really is....

Another problem is the files are probably low bandwidth, 3-4 KHz audio 
files.  And almost certainly uncalibrated.

> With four softrocks you would need 8 analog inputs so a Delta44 would be
> inadequate. There is the Delta 8?, an 8-channel version.
> The hardware we should look for is something using a good VHF-sampling
> A/D like the LTC

I believe it is possible to sync two D44s together, but I haven't looked 
into it.  The HPSDR Mercury board should be interesting when it becomes 
available (http://hpsdr.org/wiki/index.php?title=MERCURY) .

>
> To start with, you might use a Delta 44 and two softrocks with the
> current Linrad software. You may use the manual polarization setting to
> cancel undesired signals, but you could also allow Linrad to optimize
> the signal level for the interference while you listen in the orthogonal
> channel where the interference would be minimized.

Sounds interesting.  I'll give it a try when I get a chance.

73

joe n6kk 

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Leif Asbrink | 2 Oct 23:30

Re: Linrad-02.39

Hi Joe,

> The links to the data files (blinkerinitx.xxx) are broken (but I found them 
> anyway :-)).
Thanks for telling me. I have corrected the links (hopefully)

> One small issue, in windows, adfile is selected instead of adfile.txt 
> (assuming both are present).
Yes. I do not remember why i made it that way, but there must have been
some reason.......

Linrad always looks for adfile first, then adfile.txt if adfile was not
present. For some unknown reason the Linux adfile seems to
work under Windows.....

> I have not tried the transmit function, but have noticed no problems in 
> other functions so far.
Good:-)
The transmit side is not complete, and I do not think I will have the
hardware to test it this year......

> I'll try and find some files for you to work on.  I'm pretty sure various 
> low banders have samples out on the web of signals fading in and out of the 
> noise (complete with static crashes, powerline noise, electric fences, 
> plasma TV buzz, ethernet birdies, etc.).  I'll make a recording of my 144 
> MHz environment that will be a real challenge!
The problem (to me) is that low banders record their data on un-calibrated 
systems and that may cause the problem to look more difficult than it 
really is....

> Another one of my interests is low band (160/80 meters) where my noise level 
> is very high.  I have been thinking about installing a 4 square receive 
> antenna system similar to the DX Engineering system ( 
> http://www.dxengineering.com/ ) or perhaps the 2 antenna version with the 
> NCC-1 noise cancelling unit.  It seems to me that the primary functions of 
> these units (controlling the position of the main lobe of the 4 square 
> and/or noise cancelling) would be better accomplished in DSP (certainly 
> cheaper).  I was thinking about using four 160/80 meter softrocks (one for 
> each antenna with common sampling clock) and feeding the I/Q output of each 
> softrock into one channel of a D44 sampling at 96KHz.  That (I think) would 
> result in ~48 KHz sampled bandwidth (which may not be wide enough for very 
> effective noise blanking) and the softrocks probably aren't the best 
> frontends, but it would be a very interesting (cheap) experiment.  Are these 
> functions (antenna beam forming and noise cancelling) something Linrad could 
> accommodate?  :-
With four softrocks you would need 8 analog inputs so a Delta44 would be
inadequate. There is the Delta 8?, an 8-channel version.
The hardware we should look for is something using a good VHF-sampling
A/D like the LTC

Linrad is currently limited to two channels. In principle it could be
adopted to any number of RF channels that you want to supply.
At the moment Linrad only optimizes for maximum signal when Linrad
is to adjust the polarization parameters. In a multi-antenna
situation it would be better to optimize for optimum S/N. Surely
possible, but I do not have the hardware to play with such things.
(Continue reading)

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