[pskmail] Re: more on frequency changing by itself

  • From: Rein Couperus <rein@xxxxxxxxxxxx>
  • To: pskmail@xxxxxxxxxxxxx
  • Date: Sun, 09 Nov 2008 12:14:02 +0100

Fldigi is doing what it should do, i.e. hunting for a psk signal inside a 
narrow band, 
sweet spot +- 40 Hz (that is, if you set Acquisition search range to 40 Hz,

If you use pskmail-1.0.3c and fldigi 3.04AX you will use the new ARQ tcp/ip 
with a new, more effective DCD scheme. In previous versions DCD was derived 
the <US>, <SOH> and <EOT> characters. In the new interface DCD is activated by 
character decoded, i.e. also on qrm. 
Using this combination fldigi will ALWAYS tx on the sweet spot. 
Moreover fldigi 3.04AX has the bug fixed where it would TX a random part of the 
heap on 
the frequency. This was a bug in the POSIX SysV interface.
I have not yet had time to port the new interface to the server, that is in the 

(This is alpha, and needs testing, but here it has worked as advertized for at 
least 4 weeks, 
it has a bug reading the fldigi log into the monitor window).
You can find the 1.0.3c client in http://hermes.esrac.ele.tue.nl/pskmail/alpha.


Rein PA0R

> -----Ursprüngliche Nachricht-----
> Von: "Per Crusefalk" <per@xxxxxxxxxxxx>
> Gesendet: 09.11.08 10:34:33
> An: pskmail@xxxxxxxxxxxxx
> Betreff: [pskmail] Re: more on frequency changing by itself

> Hi Mike,
> I have the same behaviour here. When I use fldigi without opening the
> connection to pskmail (before I start pskmail that is) the AFC button
> works. When I start pskmail then fldigi will start to use AFC no matter
> what the AFC button indicates. So, I would label that a bug in fldigi
> (found using fldigi 3.04AX).
> I have tried the option "Check button toggle for sql and AFC" under
> Misc/Main window in config but that had no effect on this.
> What you can do to limit the problem is to use the options for a pskmail
> server (which works for a client also) within Modem/Psk. If you enable
> "use sweetspot" and limit the AFC search range then that will help.
> 73 de Per, sm0rwo
> lör 2008-11-08 klockan 18:54 -0800 skrev kd7tkq@xxxxxxxxx:
> > Just in case it wasn't obvious what I meant by the frequency changing, I 
> > meant the point on the waterfall where the "cursor" is and from which the 
> > signal is being decoded. That point was moving up and down all by itself, 
> > but ONLY with pskmail running - fldigi wors fine all by itself.
> > 
> > Oh, and it seems WB5CON has me logged as having been heard, so that 
> > confirms that pskmail was indeed communicating with fldigi and succesfully 
> > transmitting. 
> > 
> >  - Mike
> > 
> > 
> > You see, wire telegraph is a kind of a very, very long cat. You pull his 
> > tail in New York and his head is meowing in Los Angeles. Do you understand 
> > this? And radio operates exactly the same way: you send signals here, they 
> > receive them there. The only difference is that there is no cat.  --Albert 
> > Einstein, describing radio.
> > 
> > 
> > 
> >       
> > 


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