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
