I think that Fredericks(sp) made hardware that did this. They also had hardware to send and receive CW at 60-90 WPM.
Walt/K5YFW -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Behalf Of Danny Douglas Sent: Monday, November 06, 2006 8:08 AM To: [email protected] Subject: Re: [digitalradio] New digital mode proposal for CW transceivers That must be a different CCW than I used as a government employee back in the mide 60s. I dont remember a lot about it, except we had CCW equipment in our receive site, and were copying from at least two other sites. It was a commerical mode then. Danny Douglas N7DC ex WN5QMX ET2US WA5UKR ET3USA SV0WPP VS6DD N7DC/YV5 G5CTB all DX 2-6 years each. moderator [EMAIL PROTECTED] ----- Original Message ----- From: "KV9U" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, November 06, 2006 8:41 AM Subject: Re: [digitalradio] New digital mode proposal for CW transceivers > From my perspective, the thing that was so desirable for amateur radio, > was the ability to use the computer to do the DSP and make it possible > to come up with these newer modes at relatively low cost. > > Ray Petit, W7GHM, invented CCW in the early 1970's, but it required > extremely accurate timing using based on his hardware design. He is the > same person who invented Clover around 1988 and this mode also required > extremely accurate timing and frequency but he changed to a 40 msec > raised cosine pulse at 25 bps. Needless to say it never was popular due > to the need to homebrew the circuitry. This was a narrow band mode. > > Later on, Ray was able to leverage this knowledge to develop the Clover > II system which was faster, but much wider, using a 31.25 baud with four > tones. Because Clover II required a very costly hardware/software > implementation, it never became very popular either although it is used > in some proprietary commercial products along with an even faster, but > much wider bandwidth system called Clover III. This is not unlike the > Pactor I, II, and III deveopment. > > 73, > > Rick, KV9U > > > > Rein Couperus wrote: > > >>-----Ursprüngliche Nachricht----- > >>Von: [email protected] > >> > >> > > > > > > > >>In my research, I found a field of study called CCW (Coherent CW). This was typically 12 wpm cw that had a special starting pattern and also an idle pattern. No doubt 12 wpm was some sort of magic number that they found worked the best. Then further reseach led me to find that CCW eventually mutated into PSK31. > >> > >> > > > >I was involved in CCW at the time (200 mW EU to JA on 14 MHz). The 12 wpm had nothing to do with magic, it produced dits of exactly 100 ms long, a value which was very easy to generate.... > > > >Rein PA0R > > > > > > > > > > > > > > > > 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 > > > > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.409 / Virus Database: 268.13.28/518 - Release Date: 11/4/2006 > 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 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/
