All, Actually an old controversy re JT65* modes in the EME community, dead horse oft beaten but still think it is the mode suite of choice for MS and EME; also think more to the point is what other weak signal modes work as well or better with bandwidth taken into balance on HF?
If for a 60 second transmit sequence would other weak signal modes work as well (Throb, Olivia, DominoEx at low baud rates come to mind as well as KAM10) given the minimal information exchange in JT65? Interesting to try and find out! Be curious to try a 4 baud DominoEX with FEC (for example) transmit sequence sending just call and grid for one minute and see what happens on HF. Remember the WSJT modes were meant for EME, MS and weak signal VHF/UHF....anything else is a bonus. 73 Bill N9DSJ --- In digitalradio@yahoogroups.com, "Andrew O'Brien" <[EMAIL PROTECTED]> wrote: > > Good work Leigh, I was wondering about some of those -31 readings that I > could hear with my ears. I think Olivia testing is a good thing for this > weekend. > > Bonnie, the "fad" is an interesting issue. Certainly weak signal > performance is a popular goal, but I wonder if it JT65A is popular in part > to the format. If we used Olivia in short bursts with very structured > exchanges, and the Olivia software popped up SNR reports (like MixW does for > Olivia, or PC-ALE does for ALE) , I wonder if Olivia would outperform and be > more popular than JT65A? I'll argue that its not just the performance of > JT65A but the format. > > > Andy > > > On 4/20/07, expeditionradio <[EMAIL PROTECTED]> wrote: > > > > --- In digitalradio@yahoogroups.com <digitalradio% 40yahoogroups.com>, > > "Leigh L Klotz, Jr." <leigh@> > > wrote: > > > My conclusion is that this mode is about 10-15 dB worse than > > > it appears to be, and we should start doing more careful > > > tests alongside Olivia and plain old MFSK as controls in > > > side-by-side propagation conditions. > > > 73, > > > Leigh/WA5ZNU > > > > > > > Hi Leigh, > > > > After a week or so of monitoring JT65A on 14MHz and 7MHz, I tend to > > support your conclusions. > > > > It appears that "not-pre-defined-QSO" texting on JT65A is similar to > > Olivia 250/8 for weak signal robustness on HF. Although the throughput > > of texting via Olivia 250/8 is rather slow, it far exceeds glacially > > slow JT65A. > > > > Nonetheless, the recent fad flurry of activity on 14076 with JT65A > > demonstrates the enthusiasm for any potential new extreme weak signal > > modes during the bottom of the solar cycle. > > > > Bonnie KQ6XA > > > > > > > > > > -- > Andy K3UK > Skype Me : callto://andyobrien73 > www.obriensweb.com >
