Joe, I have derived both Contestia and RTTYM from Pawel's code. You may look at the sources at http://pocketdigi.sourceforge.net
Try to revert the bits before they are fed to the baudot decoder. 73, Vojtech OK1IAK --- In [email protected], "Patrick Lindecker" <[EMAIL PROTECTED]> wrote: > > Hello Joe, > > What is sure is that there is no other differences that the ones I gave in the "RX/TX modes selection and their descriptions" chapter, so modifications on: > * Block size (symbols) > * Scrambling pseudo-random sequence > * Scrambling shift (in number of bits of sequence right rotation) > * Characters set > > Try first to change from Olivia to Contestia. It is the simplest, as RTTYM adds a switch management, contrary to RTTYM. > > Then try in reception generating Contestia, without noise. You must decode it. Then adjust the different parameters of your code to decode low S/N Contestia signals. > > 73 > Patrick > > > > > > > > > ----- Original Message ----- > From: Joe Veldhuis > To: [email protected] > Sent: Wednesday, September 27, 2006 6:38 PM > Subject: Re: [digitalradio] Re: Implementing Contestia/RTTYM, could use some advice > > > Patrick only gave an outline of the differences between Olivia and the > derivative modes. What I am looking for is some pointers on the actual > task of modifying the templates to implement those differences. > > I tried implementing RTTYM by changing the "BitsPerCharacter" and > scrambling code/shift parameters in Pawel Jalocha's reference code (and > then passing the output through a Baudot>ASCII routine), but that was > apparantly not enough, since I don't get any output from the demodulator. > > -Joe, KD8ATU > > jhaynesatalumni wrote: > > I haven't looked yet, but you might look in the MultiPSK documentation, > > since Patrick recently implemented those modes in his program and may > > have written them up. > > > > > [Non-text portions of this message have been removed] >
