Hello Rick, >Yes, I was afraid of the long frames. Yes, at 100 bauds, no more than 50 bytes...
>And when you get done, it seems it would be better to use an existing >mode or new mode for an ARQ mode for sound card digital. With the same frames, in APRS for example (on in Unproto), compare the 100 bauds Packet with Pax/Pax2. I think in Pax APRS will be very much better (I hope so!) because Pax is an Olivia clone (so much more robust than Packet). >What do you think about all this talk about very high baud rate digital sound >card >programs? I think all this is very confused...It needs precise specifications for programmers on a precise mode. In the principle, why not very high baud rate, but remember that more or less, when you double the baud rate, you double the bandwidth (or and if you keep the same bandwidth you divise by 2 the euclidian distance between symbols), and, so, you increase the minimum S/N of 3 dB... The way to win dB on the minimum S/N is: *on the correction coding, which can give a gain according to the coding (Convolutional coding and Reed Solomon were the best but now "turbo-codes" approach the Shannon limit). * to decrease the number of bits by character (about 5 bits/character in PSK63F (Nino IZ8BLY) which is the best auto-synchronized coding but 4 bits/character would be ideal...). If you multiply the number of carriers, you decrease drastically the average power/peak power ratio. Note: under Windows only an asynchronosous ARQ mode is possible (as Pax) not a synchronous ARQ mode (as Pactor), unfortunatly... 73 Patrick ----- Original Message ----- From: KV9U To: digitalradio@yahoogroups.com Sent: Monday, September 04, 2006 10:04 PM Subject: Re: [digitalradio] Re: ALE QRM is minimal Hi Patrick, Yes, I was afraid of the long frames. They would have to be modified. And when you get done, it seems it would be better to use an existing mode or new mode for an ARQ mode for sound card digital. What do you think about all this talk about very high baud rate digital sound card programs? 73, Rick, KV9U Patrick Lindecker wrote: >Hello Rick, > > > >>I don't think Multipsk adjusts for baud rate below the 300 baud speed. >> >> >No Rick, it does not. However, some time ago I added a 110 bauds Packet to Multipsk and test it, for fun. It was not better that the 300 bauds (and normally it's easy to be better than the 300 bauds...). It was not very good because the frames were 3 times longer that in 300 bauds with so 3 more risk of errors. It missed a correction mean. > >73 >Patrick > > > > [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/ <*> 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/
