Rick W escribió: > Say, John, you also use Pactor 2 and 3 which are always 100 baud PSK > modes.
Pactor and Pactor 2 can work at 200 baud. Buit it requires little multipath and good SNR. > Do you find that these modes work through the ionospheric > conditions when sound card modes, even those with similar modes do > not? ARQ is a great adventage. If not acknowledged, repeat it. That is what helps to hold the link under marginal conditions. > I find PSK to be rather poor at times here at 44 degrees N latitude, > unless you are close to the MUF with a stable ionosphere. I have > never seen any published information or other comparisons of P2 and > P3 in terms of how much multipath or Doppler can be tolerated, but I > suspect that it is not all that much, and there are going to be times > that some sound card modes work (albeit slowly) and P2 and P3 simply > will not. I have never compared them, but again, ARQ is a great adventage. If some mode could compete, is at least Olivia 16/500. I had a scheduled QSO on 40 with HB9, and even when the waterfall was very faint, print was perfect. Lenghthening the symbols (lowering the speed) helps with multipath. With Doppler, I believe that differential PSK is what makes it tick on HF, otherwise, Doppler.can be very destructive on the link integrity. 73, Jose, CO2JA VI Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación Energética 9 - 12 de Junio 2009, Palacio de las Convenciones ...Por una cultura energética sustentable www.ciercuba.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/
