Re: LF: T/A OPDS DK7FC

[<jrusgrove@comcast.net>]

Stefan

Surprised at poor s/n (-46 dBOp) on initial decode ... maybe we're in a fade.

Progress monitored at : http://www.w1vd.com/grabber.html

Jay


----- Original Message ----- 
From: "Stefan Schäfer" <Stefan.Schaefer@iup.uni-heidelberg.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, October 17, 2013 9:36 PM
Subject: Re: LF: T/A OPDS DK7FC


Jay,

Correction: Markus created a special file for me which makes the ramp
time shorter than 1 ms. So now my PA can send OPDS with Markus' software
and i am on air in this mode tonite until 06:15 UTC.

Maybe you can detect me?

73, Stefan/DK7FC



Am 18.10.2013 02:56, schrieb Stefan Schäfer:
> Hi Jay,
>
> I wanted to give it a try tonite. First i wanted to use DF6NM's OPDS software which i would really 
> prefer over the ROS-OP stuff. But then i found that the sndoutpt.exe creates a ramp in the audio 
> tone. My FETs didn't like that at all, they made a crrrk at the beginning and end of each dash. 
> This is because the audio passes a comparator which makes a clear hard keyed tone for the mixer 
> which keys the IXDD414 anyway. FETs survived but it showed that i need to do hardware 
> modifications if i want to use Markus' tool.
> In WSPR-15 it may be the same but then it is just 4 times per hour and in OP32 
> is is much more.
>
> Then i installed the standard Opera program which i find very annoying. It is not even possible to 
> select a TXD line of the RS232 which i normally use for PTT. When using the standard program i'm 
> generating the tone with SpecLab (on the "LF TX PC") and key the PTT with the program (on the 
> "LF/MF RX/TX PC"). Didn't work :-/ Soldered arround to use RTS instead. PTT was keyed when 
> pressing the tune button and released when pressing it again, as intended. But then, when pressing 
> "Beacon", the PTT was key down, permanent tone.
> Need a VOX or so...
>
> So i can do no OPDS tests tonite, sorry.
>
> 73, Stefan/DK7FC
>
> PS: I'll continue with DFCW-90 now!
>
>
>
> Am 17.10.2013 18:00, schrieb jrusgrove@comcast.net:
> > Stefan
> >
> > Wasn't expecting you to start transmitting OPDS today ... just a thought for the future. But if 
> > you want to, that's okay too.
> > OPDS32 is capable of of decoding at about -50 dB s/n (relative to SSB 
> > bandwidth).
> >
> > Your call and grid is easily added at the receiving end.
> >
> > Jay
> >
> >
> > ----- Original Message ----- From: "Stefan Schäfer" 
> > <Stefan.Schaefer@iup.uni-heidelberg.de>
> > To: <rsgb_lf_group@blacksheep.org>
> > Sent: Thursday, October 17, 2013 10:57 AM
> > Subject: Re: LF: T/A OPDS DK7FC
> >
> >
> > PS: Jay, Markus,
> >
> > What is the S/N performance of OPDS compared to WSPR-15 (apart from the
> > fact that the callsigns must be known in advance and that there is less
> > information into one sequence) ??
> >
> > 73, Stefan
> >
> > Am 17.10.2013 16:55, schrieb Stefan Schäfer:
> > > Jay,
> > >
> > > Am 17.10.2013 14:36, schrieb jrusgrove@comcast.net:
> > > > Several stations on this end are now set up to receive OP Deep Search ... including Garry K3SIW 
> > > > in IL. Being that far inland is quite a disadvantage for T/A signal reception compared to 
> > > > 'coastal' stations.
> > > Garry got several WSPR-15 decodes of me last season, so i think he could make it in OPDS as 
> > > well.
> > > > On my end I'm interested to see if it's possible to roll back the earliest T/A reception times 
> > > > (current best of about 2045Z mid season). There are probably other 'unknowns' waiting to be 
> > > > discovered along the way ;~) .
> > > OK, i can give it a try. Not sure if i can make it today arround 20 UTC but i 
> > > will try.
> > > Am i already included in the OPDS list as a possible station?
> > >
> > > 73, Stefan/DK7FC