Coding Coding Mode Baud Speed Correction Convolution Interleaving SNR (in dB) Bandwidth DominoEx11 10.766 77 WPM No No Not Stated Not Stated 194 Hz DominoEx22 21.533 154 WPM No No Not Stated Not Stated 388 Hz MT63-1K 10 100 WPM No No Yes -5 1000 Hz
Perhaps the bandwidth of MT63 and its SNR threshold may have been the difference. But I don't know what the SNR threshold of DEx11 and DEx22 are. Also, they are different types of modulations. Walt/K5YFW -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Behalf Of Bill McLaughlin Sent: Tuesday, February 20, 2007 10:21 PM To: [email protected] Subject: [digitalradio] Re: DEX vs. MT-63 Hi Rick, That pretty much echos my experience too...DominoEX at 11 baud seems to be the best compromise for 80/160. Unless the S/N ratio is pretty high, I have not had the best of results with either CHIP or MT63....when S/N levels are high these modes work very well. As for MIL-STD-188-141A/ALE...still looking for a place I feel comfortable placing a 2000 Hz wide digital signal upon....no issues trying that on 10/6/3, but of course noone will hear me there. Anxious to try it though; I sense alot of work went into it by Patrick. 73, Bill N9DSJ --- In [email protected], KV9U <[EMAIL PROTECTED]> wrote: > > This evening the other station that I have been having a weekly hour > testing session with, met on 160 meters tonight. The QRN levels are not > bad (for 160), but there were static crashes over S9. > > We used Domino EX/FEC at the 11 baud speed to start and had good luck. > We then moved up to DEX22/FEC and still found pretty good quality print > although there were some hits for some of the static crashes. > > We then attempted to use 100 wpm, 1000 Hz wide MT-63. Very poor results. > Now I did not change my transmitter power and got very little print from > me. He normalized his power for 40 watts average and even then his print > on my end was very poor. I would get a few characters such as callsign > exchange, but miss a dozen or more characters in a row. We were forced > to go back to DEX22/FEC and finished up there. > > I do want to try the ALE mode since it was incorporated into Multipsk. I > downloaded the program and I think I understand how to connect to > another station. Anyone on tonight yet? 160 and up. Butternut vertical > ground mounted here. Also, on 80 meters, NVIS inverted vee dipole. > > Any Technician hams planning to operate CW or digital or voice on Friday? > > 73, > > Rick, KV9U > Announce your digital presence via our DX Cluster telnet://cluster.dynalias.org Our other groups: http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/themixwgroup http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/wnyar http://groups.yahoo.com/group/Omnibus97 Yahoo! Groups Links
