[digitalradio] Re: Implementing Contestia/RTTYM, could use some advice
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 digitalradio@yahoogroups.com, 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: digitalradio@yahoogroups.com 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 BaudotASCII 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]
[digitalradio] Re: Implementing Contestia/RTTYM, could use some advice
Hi Joe. I have to confirm what Parick wrote. I am working on Olivia/Contestia/RTTYM for PocketDigi and after doing what Patrick described I was able to send/receiver contestia. I am using Pawel's code, but I removed a lot of dead code before I started to understand it. I am affraid you would not want to use my code directly because it uses fixed point arithmetics, which is not as precise as the original floating point code. 73 and GL, Vojtech OK1IAK --- In digitalradio@yahoogroups.com, 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: digitalradio@yahoogroups.com 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 BaudotASCII 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]
[digitalradio] Re: Implementing Contestia/RTTYM, could use some advice
--- In digitalradio@yahoogroups.com, Joe Veldhuis [EMAIL PROTECTED] wrote: Hello list. I have been trying to implement support for the Contestia and RTTYM modes in a fairly new digimode app, fldigi (www.w1hkj.com). 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. Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
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 BaudotASCII 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. Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [digitalradio] Re: Implementing Contestia/RTTYM, could use some advice
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: digitalradio@yahoogroups.com 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 BaudotASCII 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] Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
