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 1.024s
0.9766
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 started by
hitting the RX / TX button.
Best 73,
Markus (DF6NM)
