Hello Tony, RR for all.
If you have some spare time, some modes would be interesting to be tested (with Multipsk): - PSK10, - PSKAM10, - ARQ FAE in ALE400 (simply with "Unproto" APRS frames, as the ARQ memory can be used only when connected), - ALE AMD, DTM and DBM (DBM is the best ALE sub-mode), - Packet 110 bauds (with Unproto frames) And perhaps: - RS ID - Video ID TKS! 73 Patrick ----- Original Message ----- From: "Tony" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, August 26, 2008 1:22 AM Subject: Re: [digitalradio] Re: Path Simulations for PAX / HF Packet > Patrick, > >> Hello Tony, Glad you did measures for Pax. > > My pleasure; thanks for adding the mode to Multipsk! > >> My figures are the following: Lowest S/N : - 10 dB for PAX and - 7 dB for >> PAX2. It corresponds to a Gaussian noise without any ionospheric >> distortion (your >> first case. > > Just tested PAX and PAX2 again for the lowest S/N (Gaussian noise only) > and > came up with -11db for PAX and -7db for PAX2. Very close. > >> Normally there is a 3 dB difference between these 2 modes as there are >> strictly the same except that Pax2 is twice quicker than Pax. > > Understand Patrick. Ionospheric distortion seems to widen the gap between > the two with PAX coming out ahead by 5db or so. I used the 100% decode > criteria so that may be the difference. The PAX2 mode did not print at > all > (regardless of SNR) with the two most disturbing ionospheric simulations. > >> Note: Pax and Pax2 modulations are clones of Olivia, let's say very close >> on >> modulation to Contestia. > > No wonder why they work so well! > >> For Pax and Packet there is no ARQ memory (contrary to ARQ FAE), so the >> minimum S/N in connected mode would be the same as in Unproto. > > Thanks for clarifying that. > >> Note: it could be theoritically possible to implement ARQ memory in Pax >> and >> Packet (which would give a sort of FEC (repetition)coding to these >> modes), >> but it would need time... > > Interesting. > > Thanks Patrick. Let me know if I can help with any mode simulations you > haven't tried yet. > > Tony, K2MO > > > ------------------------------------ > > Announce your digital presence via our Interactive Sked Page at > http://www.obriensweb.com/sked > > Check our other Yahoo Groups.... > http://groups.yahoo.com/group/dxlist/ > http://groups.yahoo.com/group/contesting > http://groups.yahoo.com/group/themixwgroup > Yahoo! Groups Links > > > > >
