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No Albert ... these are all TX methods , which is a
good thing as Opera is also part of
the second generation vhf fixed beacons ,
so various ways of generating the TX code
are / will be needed ....
We are 'all' waiting for a second
party DSP decode hardware/ software , that
can receive and decode the message , in the
mean time , we can all use the free windows
version ... may be for some time I think ?
73-G.
Sent: Tuesday, July 17, 2012 2:05 PM
Subject: Re: LF: opera coding demistified
All,
Who is still receiving and reporting
at the end of the day. If we all start building smart PIC and other means to
generate Opera.
Do I miss something here, or are that only the stupid ones that use a PC to
generate/receive and report Opera ?
73, Albert PA0A
Op
17-7-2012 12:14, M0FMT schreef:
Hi All
Why lock up a PC to beacon Opera? I use G4JNT's excelent PIC progragram.
He supplies the Hexadecimal code for you to program your own PIC which gives
you just that little bit more satifaction in building a PIC based
project.
It is easy to build has full OP modes and sensible and adjustable
interval timing, no bigger than a matchbox!.
73 es GL Pete M0FMT IO91UX
Stefan Schaefer wrote
> G.., i have done it. Downloaded ... to my LF PC.
Still can't belive it...
... well, I haven't ;-) Out of curiosity, I have
instead implemented Guido's excellent guide on Opera
encoding
in a little Basic program, which outputs the
110... keying sequence for any given callsign.
And it works! For a quick
on air test, I decided to use SpecLab's test signal generator, modulated by
an arbitrary waveform which can be loaded from a text
file. To fit to the required data format, I edited
the sequence by zero-padding from 239 to 256 symbols, then
replacing every "1" by two lines of "32767", and every
"0" by two lines of "0", giving 512 samples total. For "Op4" speed, the AM modulator period was set to 0.256*4*256 =
262.144 seconds. Audio output was used to key my TX on 478.63
kHz. I sent for strings on Saturday night 21:30 to 21:47, and
within a few minutes, pskreporter.de showed spots from DF2JP,
G8HUH, ON6EO and DD7PC.
In case you would also like
to send Opera without "his master's software", or associate obscure
received sequences with possible candidates, the little program
and sourcecode is at
Best 73,
Markus (DF6NM)
Sent: Friday, February 17, 2012 11:48
AM
Subject: LF: opera coding
demistified
PE1NNZ seems to have demistified the opera
coding, those interested can read the attached file.
73, Rik
ON7YD - OR7T
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