LF: Re: Reception report from Norway

[Markus Vester <markusvester@aol.com>]

Thanks Robert and Graham.

 

Being a bit of an "Eigenbroetler" I decided not to use the Opera software from Jose Ros but rather make my own. Thus there is no internet broadcasting when I transmit, and PSK reporter apparently assigns some wrong default QTH to incoming reception reports.

 

My little transmit software (including sources) is on
 http://df6nm.bplaced.net/opera/
and Wolf's sound utilities can be found in
 http://www.qsl.net/dl4yhf/soundutl/sndutl_e.zip

 

If you want to use it, you have to generate an Opera 110... sequence once for your callsign by typing
 opgen df6nm >opera.txt
into a DOS box, and expand it to an opera.dat file containing 16 IQ-samples per symbol using
 optxtdat

Then to start a transmit session, type
 start sndoutpt /sr=12000 /dec=6144 /fc=2070
which opens a tiny SndOutpt window and waits to be fed with an IQ data file. The upsampling factor dec is 750 times the dash length in seconds, and should be 6144 for Op-32 or 1536 for Op-8 mode. The desired audio frequency fc can also be edited at runtime. Finally the transmission is initiated by
 copy opera.dat audio.dat
A nice feature on the side is that the dashes will have smooth edges, which minimize keyclicks when used with a linear transmitter.

 

I'm still working on the receive side, and the first results using coherent correlation have been very promising.

 

Best 73,
MArkus

Re: Reception report from Norway

Tue Sep 4, 2012 5:59 pm
"graham787" <g0nbd@...>

 

Well, I think DF6NM is also confused as to why he is located in the UK
.... all we can ask is that Markus checks the qra locator entered into Opera
and if this is correct, then ,will have to flag this up to Philip / Jose (PSK
Map)for investigation

 

The Phantom (of the opera) Tx spots are to ensure Rx stations are showing
on the psk-map 'before' any decode is made ... a handy check as often you
could be the 'only' station on the band and with 32 mins tx cycle , its
nice to know there is someone at the other end !

 

73 -Graham.

 

--- In rsgb_lf_group@..., "robert_la4ana" <la4ana73@...> wrote:
>
> Thanks to all for last night's TX activity. It was very helpful in order to
gain an impression of my new 136 kHz receive set-up. I am currently using a
untuned 65 square meter loop antenna (oriented North/South) and a Kenwood
TS-590, no seperate pre-amp (yet).
>
> During my first "night at the Opera" I received the following stations (data
recovery from PSK-reporter):
>
> sNR mode MHz rxTime Call Loc
> -28 OPERA 0.136000 03.09.2012 19:30 PA0A JO33DE
> -34 OPERA 0.136000 03.09.2012 20:07 G3XDV IO91VT
> -25 OPERA 0.136000 03.09.2012 20:28 PA0A JO33DE
> -33 OPERA 0.136000 03.09.2012 20:40 G3XDV IO91VT
> -35 OPERA 0.136000 03.09.2012 21:13 G3XDV IO91VT
> -38 OPERA 0.136000 03.09.2012 21:45 G3XDV IO91VT
> -13 OPERA 0.136000 03.09.2012 21:57 DK7FC JN49IK
> -37 OPERA 0.136000 03.09.2012 22:18 G3XDV IO91VT
> -14 OPERA 0.136000 03.09.2012 22:29 DK7FC JN49IK
> -31 OPERA 0.136000 03.09.2012 22:56 DF6NM IO91UX
> -31 OPERA 0.136000 03.09.2012 23:24 G3XDV IO91VT
> -37 OPERA 0.136000 04.09.2012 01:10 G3XDV IO91VT
> -35 OPERA 0.136000 04.09.2012 01:43 G3XDV IO91VT
> -34 OPERA 0.136000 04.09.2012 02:16 G3XDV IO91VT
> -30 OPERA 0.136000 04.09.2012 02:48 G3XDV IO91VT
> -29 OPERA 0.136000 04.09.2012 03:21 G3XDV IO91VT
> -25 OPERA 0.136000 04.09.2012 03:54 G3XDV IO91VT
> -35 OPERA 0.136000 04.09.2012 04:27 G3XDV IO91VT
>
> It puzzles me a bit to receive DF6NM at locator IO91UX instead of in Germany,
but it seems that some other stations also report that locator. In addition,
PSK-reporter is reporting many decodes of my own call. However, I was not
transmitting nor did I activate the Opera beacon function. May be someone can
explain, as I am relatively new to Opera and PSK-reporter.
>
> Keep up the good work. I hope to join as a transmitting station as well in the
not too distant future.
>
> 73 de Robert
> LA4ANA
>