[digitalradio] Re: pactor II receving
Hi Rickm --- In digitalradio@yahoogroups.com, "Rick Williams" <[EMAIL PROTECTED]> wrote: > It is unlikely that this will be done. The system (both hardware and > software) is proprietary and will probably always remain that way. I agree. > Since you > are unable to have self policing by the radio amateur community (unless they > have the specific product sold only by one company), Pactor II and III may > not be the most appropriate modes on the ham bands. They almost become de > facto "encrypted" modes, quite unlike other digital modes. I think this is a little overstated, only in that <$900 for a SCS modem -- while certainly not cheap -- is often not that much compared to how much many people spend on their HF radio, antenna system, computer, etc. that they'll be using it with. The problem, IMO, is that while STS managed to meet its legal obligation to the FCC of "documenting" the Pactor III standard, they were allowed to get away with doing it in a barebones fashion from which it would be very difficult for anyone else to build a decoder. Hence the FCC has opened the door to anyone coming up with their own "poorly documented" standard, and it is a fair point that a $900 proprietary modem for each one would quickly get out of hand. (And as long as I'm picking on the FCC, I also think it's poor that they let Garmin get away with modifying the FRS rules such that they could transmit GPS locations from radio to radio. A very useful feature, but the FCC didn't require them to document the on-air format! ARRRGH.) > But I am hopeful that eventually we will be seeing ARQ digital modes, such > as SCAMP, that can hopefully obsolete Pactor on the ham bands. I am too, but keep in mind that the robustness of Pactor III is one of the reasons that HF digital has become as popular (and hotly contested!) as it is today in the first place. STS deserves kudos for originating such a good product, even if they weren't too forthcoming with regards to documenting its operation. ---Joel Kolstad The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> 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: pactor II receving
-Original Message- From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Joel Kolstad Sent: Thursday, May 19, 2005 8:40 AM To: digitalradio@yahoogroups.com Subject: [digitalradio] Re: pactor II receving [text deleted] > But I am hopeful that eventually we will be seeing ARQ digital modes, > such as SCAMP, that can hopefully obsolete Pactor on the ham bands. I am too, but keep in mind that the robustness of Pactor III is one of the reasons that HF digital has become as popular (and hotly contested!) as it is today in the first place. STS deserves kudos for originating such a good product, even if they weren't too forthcoming with regards to documenting its operation. ---Joel Kolstad I take exception to you statement that Pactor III is robust. The test done by KN6KB and presented on page/slide 17 of his SCAMP presentation to the DCC last November shows that at a -5 dB SNR on an "averaged" CCIR channel using the KC7WW channel simulator, that the bytes per minute throughput was not more than 500 bytes per minute. KC7WW's tested MT63-2K on his channel simulator and found 100% copy at a -5 dB SNR on a "POOR" CCIR channel and the speed was 1200 bytes/minute. At a 0 dB SNR on an "averaged" CCIR channel, Pactor III has a 4000 bytes per minute throughput. I guess the thing you want to define is how robust do you want a mode to be. Typical signals over long skywave paths may be 0 to -5 dB but their are propagation problems that Pactor III doesn't consider that MT63 does. So even with a 0 dB SNR, Pactor III still may not have a throughput of 4000 bytes per minute. Walt/K5YFW [Non-text portions of this message have been removed] The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> 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/
[digitalradio] MT63 part of the Digi Pentathlon
Hello digi op's, 20.05.2005 1800-2400 UTC you have good chance to get more QSO's on this very nice but exotic mode - MT63 working conditions - USB 500Hz long interleave on all (10-160m) bands exclude WARC. Hope to meet you! Full info about Pentathlon and Digital QSO Club membership www.dqso.nete-mail: [EMAIL PROTECTED] Next stage of a mode - Hellschreiber - 27.05.2005 1800-2400 UTC -- Best regards, Vyacheslav-RW3AA mailto:[EMAIL PROTECTED] The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> 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/
[digitalradio] Spam, amusing
I weed out about 20 spam messages per day to this group. I thought this one quite amusing FROM: eko@ DATE: Thu, 19 May 2005 23:59:04 +0300 SUBJECT: hello. Hi, My name is Miss Amanda Seko . My hobbies are reading,music,watching of movies.sweeming; and playing of basket ball. I like will like to establish a relationship with you. In addition, you can contact me with my e mail address .com> In the main time how are you doing with hope that every thing is in good perfection and without waisting your time; l want to tell you the reason that lead me in contacting you, l am moved to understand --- "Sweeming " sounds like an interesting hobby Andy K3UK Moderator [Non-text portions of this message have been removed] The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> 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/
[digitalradio] Re: Spam, amusing
Andy, How do these spamers come up with all this stuff that don't make any sense? At least the Viagra and body enhancement messages have slowed down to almost nothing. Jerry The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> 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/
[digitalradio] Fixing the 144.39 APRS Network
FYI Andy k3UK Fixing the 144.39 APRS Network http://www.ew.usna.edu/~bruninga/aprs/fix14439.html The New n-N Paradigm [Non-text portions of this message have been removed] The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> 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/
