[digitalradio] Re: QRV ALE-400 ARQ chat mode -- 14074.0
Hi Skip. The DOS executable is here: http://www.cnunix.com/ftp/hamradio/tapr/software_lib/utils/7plus20.exe The source code is here: ftp://sunsite.unc.edu/pub/Linux/apps/ham/7pl217sr.tgz 7plus is available as installation package in some Linux distributions. I was maintaining 7plus installation package and other HAM applications for SuSE Linux in Prague when I was a student. There is one neat thing about 7plus. 7plus files have standard header and tail. The packet radio modems often snipped out the 7plus sections from their RX window and stored them into appropriate files. Some applications even executed the 7plus utility to decompress the data when all pieces were received. There were even programs, that extracted 7plus files from monitor. This allowed for multicasting, if the link quality was good. 73, Vojtech --- In digitalradio@yahoogroups.com, kh6ty kh...@... wrote: That's neat, Vojtech. Is there a link to download 7plus? WRAP only calculates a checksum for the entire file, and if it will not unwrap, we just resend the whole file. 73, Skip KH6TY Vojtech Bubnik wrote: so we developed the Wrap program, which sends a checksum at the end of the message, and error-free reception can be verified that way. Hi Skip. From the Packet Radio times, we have a 7plus utility, which splits a longer binary file to multiple parts and adds mild error detection / correction codes. After you receive all parts and run them through 7plus, if there are errors, the application will generate a request message, which will identify missing parts to be repeated. 73, Vojtech AB2ZA -- *Skip KH6TY* http://KH6TY.home.comcast.net
Re: [digitalradio] Re: QRV ALE-400 ARQ chat mode -- 14074.0
Thanks Vojtech! 73, Skip Vojtech Bubnik wrote: Hi Skip. The DOS executable is here: http://www.cnunix.com/ftp/hamradio/tapr/software_lib/utils/7plus20.exe http://www.cnunix.com/ftp/hamradio/tapr/software_lib/utils/7plus20.exe The source code is here: ftp://sunsite.unc.edu/pub/Linux/apps/ham/7pl217sr.tgz ftp://sunsite.unc.edu/pub/Linux/apps/ham/7pl217sr.tgz 7plus is available as installation package in some Linux distributions. I was maintaining 7plus installation package and other HAM applications for SuSE Linux in Prague when I was a student. There is one neat thing about 7plus. 7plus files have standard header and tail. The packet radio modems often snipped out the 7plus sections from their RX window and stored them into appropriate files. Some applications even executed the 7plus utility to decompress the data when all pieces were received. There were even programs, that extracted 7plus files from monitor. This allowed for multicasting, if the link quality was good. 73, Vojtech --- In digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com, kh6ty kh...@... wrote: That's neat, Vojtech. Is there a link to download 7plus? WRAP only calculates a checksum for the entire file, and if it will not unwrap, we just resend the whole file. 73, Skip KH6TY Vojtech Bubnik wrote: so we developed the Wrap program, which sends a checksum at the end of the message, and error-free reception can be verified that way. Hi Skip. From the Packet Radio times, we have a 7plus utility, which splits a longer binary file to multiple parts and adds mild error detection / correction codes. After you receive all parts and run them through 7plus, if there are errors, the application will generate a request message, which will identify missing parts to be repeated. 73, Vojtech AB2ZA -- *Skip KH6TY* http://KH6TY.home.comcast.net http://KH6TY.home.comcast.net -- *Skip KH6TY* http://KH6TY.home.comcast.net
[digitalradio] Re: QRV ALE-400 ARQ chat mode -- 14074.0
so we developed the Wrap program, which sends a checksum at the end of the message, and error-free reception can be verified that way. Hi Skip. From the Packet Radio times, we have a 7plus utility, which splits a longer binary file to multiple parts and adds mild error detection / correction codes. After you receive all parts and run them through 7plus, if there are errors, the application will generate a request message, which will identify missing parts to be repeated. 73, Vojtech AB2ZA
Re: [digitalradio] Re: QRV ALE-400 ARQ chat mode -- 14074.0
That's neat, Vojtech. Is there a link to download 7plus? WRAP only calculates a checksum for the entire file, and if it will not unwrap, we just resend the whole file. 73, Skip KH6TY Vojtech Bubnik wrote: so we developed the Wrap program, which sends a checksum at the end of the message, and error-free reception can be verified that way. Hi Skip. From the Packet Radio times, we have a 7plus utility, which splits a longer binary file to multiple parts and adds mild error detection / correction codes. After you receive all parts and run them through 7plus, if there are errors, the application will generate a request message, which will identify missing parts to be repeated. 73, Vojtech AB2ZA -- *Skip KH6TY* http://KH6TY.home.comcast.net
Re: [digitalradio] Re: QRV ALE-400 ARQ chat mode -- 14074.0
I cannot understand why you don't use the pskmail arq binary mail attachment feature for this. 7 plus was developed for the ancient packet BBS system around 1978 (which means it is 30 years old). We have more modern protocols now... Using the mail attachment system has a lot of advantages for NBEMS work. It allows you to comment the file in the same message, which makes archiving and retrieval a lot easier than ftp. 73, Rein PA0R -Ursprüngliche Nachricht- Von: kh6ty kh...@comcast.net Gesendet: 04.07.09 15:59:59 An: digitalradio@yahoogroups.com Betreff: Re: [digitalradio] Re: QRV ALE-400 ARQ chat mode -- 14074.0 That's neat, Vojtech. Is there a link to download 7plus? WRAP only calculates a checksum for the entire file, and if it will not unwrap, we just resend the whole file. 73, Skip KH6TY Vojtech Bubnik wrote: so we developed the Wrap program, which sends a checksum at the end of the message, and error-free reception can be verified that way. Hi Skip. From the Packet Radio times, we have a 7plus utility, which splits a longer binary file to multiple parts and adds mild error detection / correction codes. After you receive all parts and run them through 7plus, if there are errors, the application will generate a request message, which will identify missing parts to be repeated. 73, Vojtech AB2ZA -- *Skip KH6TY* http://KH6TY.home.comcast.net Announce your digital presence via our Interactive Sked Pages at http://www.obriensweb.com/sked Recommended digital mode software: Winwarbler, FLDIGI, DM780, or Multipsk Logging Software: DXKeeper or Ham Radio Deluxe. Yahoo! Groups Links -- http://pa0r.blogspirit.com Announce your digital presence via our Interactive Sked Pages at http://www.obriensweb.com/sked Recommended digital mode software: Winwarbler, FLDIGI, DM780, or Multipsk Logging Software: DXKeeper or Ham Radio Deluxe. 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:digitalradio-dig...@yahoogroups.com mailto:digitalradio-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: digitalradio-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] Re: QRV ALE-400 ARQ chat mode -- 14074.0
--- In digitalradio@yahoogroups.com, Rick W mrf...@... wrote: It seems that there are only a handful of hams who have any interest in ARQ modes for chatting. I guess I'm one of that handful, but right now I'm working my way back from some lightning damage that killed two computers, among other things. Jim W6JVE
