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Uwe,
good news! I'm watching and
searching ;-)
Background noise seems to be a few dB higher
than the last couple of days, but we'll see what's possible anyway.
Unfortunately the OK2BVG grabber website appears
to be down at the moment.
Good luck!
73, Markus (DF6NM)
PS: In my original mail, the Op-8 line in the
speed table erroneously contained an entry for Op-4. This has
been corrected beneath.
Sent: Saturday, December 28, 2013 12:14 PM
Subject: LF: Sending Opera with SpecLab
Hi
all, the PA has been switched on. the next txt block will start
now. GL Uwe/dj8wx
Von: [email protected]Gesendet:
27.12.2013 15:47 An: [email protected]Betreff:
Re: Re: LF: Sending Opera with SpecLab
Hi Markus, Wolf, Stefan, Peter es all, tks for the
advice, Markus
now SpecLab is beaconing in mode Op-4H on 8969.99Hz
the PA is off until it is dry outside.
I keep your proposal txing btwn 0700 and 1400MEZ in mind,
Markus.
GL
Uwe/dj8wx/dj8CAT
Von: [email protected]Gesendet: 27.12.2013 12:16 An:
[email protected]Betreff: Re: LF: Sending Opera with SpecLab
Greetings all,
(and apologies to Markus for juming
in so quickly..)
The principle described by Markus is only for
transmission.
To take place of the DS option, i.e. for RECEPTION, spectrum
lab would have to modified to some extend, last not least it would need an
'automated' method to build the correlation patterns for the DS mode itself.
Since Markus has already provided his opera generator (thanks for that!), it
could be modified into a command-line driven tool (exe or dll) which SL could
invoke to create the 239-bit message pattern for the correlators. I cannot
promise too much yet (being busy from too many other projects) but maybe
when the new 'super-linear', moderate-power, switching mode amplifier is
finished I'll have a look at it again.
All the best,
Wolf
DL4YHF .
Am 27.12.2013 02:00, schrieb Bob Raide:
Markus; Can this take the place of DS option used with
OPERA?
From: [email protected]To: [email protected];
[email protected]Date:
Fri, 27 Dec 2013 01:45:14 +0100 Subject: LF: Sending Opera with
SpecLab
Today I finally found a
simple solution to send Opera sequences from SpecLab's digimode terminal.
The nice thing about
this is that you can use all of SpecLab's powerful functions, like samplerate
correction, adjustable pulse shaping, or high audio frequencies.
This seems very useful, especially in the context
of possible future VLF Opera transmissions.
First you will need to
create a text file consisting of the 239 bit 1101... sequence for
your callsign. This can be generated from the PIC menu in the original
Opera software. Or you can use my little code generator tool at
http://df6nm.bplaced.net/opera/opera_generator.zip - simply
copy opgen.exe from the zip and type
opgen mycallsign
>opera.txt
into a
command window.
In SpecLab, open the
digimode terminal and configure it for ASK with no encoding, as shown in the
attached "_settings" screenshot. The symbol rate has to be set to
the inverse dotlength for the desired Opera speed:
mode
dotlength rate
(seconds) (sym/s)
Op-8 2.048s
0.4883
Op-32 8.192s
0.12207
Op-4H 65.536s
0.01526
Shaping time can be selected from hard (0%) to soft (50%)
keying. Then enter your desired audio frequency and use "Load TX text"
from the file menue to load your opera.txt file. The sequence will appear
in the TX window, and the transmission can be started by hitting the
RX / TX button.
Best 73,
Markus (DF6NM)
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