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
