[Linrad] Re: Networking issues

[Leif Asbrink <sm5bsz.com; leif@xxxxxxxxxxxxxxxx>]

Hi Russ,

> Hi All. I'm new to this group and to Linrad, although I've known about
> it for a few years and have been somewhat following it's progression.
> Leif, you may recall meeting me at the EME conference in Trenton, NJ a
> few years ago.
Yes:-)
 
> Anyway I bought a SDR-IQ and got it working.  Then installed Joe's
> MAP65 package which includes linrad.  After a day of playing with it I
> got it working on my laptop where the SDR-IQ is connected.  In fact it
> works very well.  Next I wanted to network it so I could run Linrad +
> the IQ on the laptop in the basement (where the antenna is), but run
> Map65 upstairs on my main machine.  That went fairly well too and
> works fine, however it leaves me unable to hear the audio.  Now I know
> there are other ways to get audio up here, in fact I've done it with
> HRD and NetMeeting, but the audio is choppy when doing that.  So I
> read about Linrad networking and thought I could run a networked slave
> copy of Linrad up here and run Map65 up here too.  That is where I
> have run into some problems.
> 
> The first one is just a small textural error in the setup menu but I
> thought you might like to know about it.  In the network menu, if you
> use option #3 to set the receive IP address, you get a message that
> says "Set receive address to -1 to read from file par_netsend_ip...".
> That stumped me for a while.  I finally found in online notes that I
> readlly needed to use file "par_netrec_ip", but the wrong setup
> message did cause a problem.  I spent a while trying to add a secone
> IP address to the netsend file.  Not a big deal and easily fixed, I am
> sure.
My memory is not quite what it used to be, but I think this error
was corrected long ago. The version of Linrad that you are using is 
probably rather old. The current version is 03-08

> Once I got the addresses fixed, the two instances of Linrad started
> talking, but I have some problems.  The main one is that the
> frequencies of the two instances do not match.  For example if I set
> the master frequency to 14.075, the slave gives me a frequency range
> below that frequency.  So If I tune the master to 14.076, the slave
> actually receives signals about 50 KHz lower than that.  It is
> impossible to tune the slave above about 14.050 in this example.  The
> same thing holds true for any other frequency or band.
Presumably you have only half the spectrum. Use the arrows to see a 
wider spectrum. The frequency that you have entered in the master
instance of Linrad should be the center frequency of the slave as well
as of any other instance.

> Also, I note that when I change frequencies on the master (by entering
> the center frequency in the type-in box), the slave does not know it
> and continues to think it is on the original frequency.
This is an error. I suggest you try to run the master with the Linrad 
default sendto address and then let the slave in your second computer
listen to it on the default receive address. Then make the slave 
send to 127.x.x.x or where MAP-65IQ wants to pick up the data.
That would mean that you send one set of 16 bit data between the
computers.
 
> Finally it seems that I have to increase the gain of the master
> drastically in order to get enough signal in the slave to be heard or
> make the waterfall signals visible.
> 
> I wonder what I am doing wrong here?  
I do not know. Something is wrong because the data should be identical
is the slave and in the master.

You may have detected a bug or you may have done something that is
incorrect. I do not know.

> I played with it for hours today
> but was unable to affect any change.  The version of Winrad I am using
> is 3.05B, and both master and slave are running on Pentium PC's under
> Windows XP (SP3).
Linrad-03.05b ;-)

I suggest you make a fresh install of Linrad-03.08. That means create
a new directory where you unpack wlr03-08 and start Linrad.exe on your
first computer (to which the SDR-IQ is connected.) That would be
your Linrad master. Configure the network with default addresses 
and set the master to send 16 bit raw data.

Then make a second directory which is a copy of the new installation
on the same computer. Start linrad.exe from the second directory to get
a Linrad slave with its own parameters. Configure the network with 
default addresses and set the slave to receive 16 bit raw data.

With the same parameters in Linrad you should see identical spectra
and waterfalls in the master and slave.

Then move the slave to the other computer. Just copy everything in the 
slaves directory. It should work exactly the same.

Use the parameters that Joe supplied in the slave and set the slave 
to transmit FFT2 to MAP65-IQ. That would implicate a par_netsend_ip 
file.

I think you would end up with something that works.

Then, I would appreciate if you can analyze what you did and that 
does not work. The Linrad installations you currently have would be 
left as they are now so you can go back to a non-working system.
Regardless of the reason I think your experiences motivate a change
somewhere to avoid others from running into the problems you have
experienced. BUT, before doing anything else you should upgrade to
03-08 to see if the problems are still present.

73

Leif / SM5BSZ


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