Recent sporadic-E propagation openings on 6 meters and elsewhere have pointed up the need for a digital mode having faster turnaround time than currently available software versions offer. A recent WSJT-X reflector discussion allowed that, while the slow ’JT modes like JT65 and JT9 have excellent sensitivity, their 1-minute long transmissions may not permit completion of a contact when evanescent signals pop up and quickly disappear under certain E-skip conditions. MSK144 and the fast JT9 submodes allow much shorter transmissions, but they do not offer the multi-decode capability that JT65 users find so effective. Iain MacDonnell, N6ML, was among those remarking that, while the use of JT65 for working E-skip on 6 meters has really taken off, it’s too slow to be practical for openings that only last a couple of minutes or so.
Joe Dzekevich, K1YOW, of Harvard, Massachusetts, sounded a similar theme. “A few days ago we had a great opening on 6 meters, especially here in the New England USA area, given our latitude,” he noted. “I often find that often one cannot complete a QSO due to QSB and the ins and outs of Es. Yet, being a propagation buff, I love the idea that I can leave the rig on 50.276 in JT65 mode and then see who I hear throughout the day via PSK Reporter.”
WSJT-X developer Joe Taylor, K1JT, weighed in to express his appreciation to all who shared their ideas and experiences using JT9 and JT65 modes during recent multi-hop E-skip openings on 6 meters.
“We are very much aware that a mode with most of the excellent characteristics of JT65, but with faster turnaround time, would be a big winner in such situations,” Taylor commented on behalf of the WSJT-X development team. “We are experimenting with several such possibilities. Tentative goals include 15-second T/R sequences, sensitivity around S/N = –20 dB, occupied bandwidth less than that of JT65, and capability to decode as many as 10 or 20 signals in a 2-kHz bandwidth.”
But, Taylor added, developing new modes takes a lot of time, and results are not guaranteed. “We will report significant progress if and when available,” he pledged.
According to the WSJT-X page, JT9 is optimized for LF, MF, and HF, and it’s some 2 dB more sensitive than JT65 while using less than 10% of the bandwidth. Both JT9 and JT65 permit DX contacts at very low power levels and modest antennas. — Thanks to Joe Taylor, K1JT
How to get on JT65
BITX40 Work the world on 40 meters When was the last time you used a radio you had built? The BITX40 board is single circuit board 40 meter SSB transceiver module. Inside an evening, you can be on-air with this SSB transceiver module, chatt... Read more
Base price (excluding tax): 36,800 yen ● reception frequency range: 0.100 ~ 252.895MHz / 255.100 ~ 261.895MHz 266.100 ~ 270.895MHz / 275.100 ~ 379.895MHz 382.100 ~ 411.895MHz / 415.100 ~ 809.895MHz 834.100 ~ 859.895MHz / 889.100 ~ 914.895MH... Read more
The World Digital Amateur Television (DATV) QSO Party will celebrate its 5th year when it gets under way August 21-22. Organizer and anchor Peter Cossins, VK3BFG, has been busy planning for another successful event. While the event is cente... Read more
FT-891 HF+50Mhz ALL MODE MOBILE TRANSCEIVER The FT-891 HF All Mode Mobile Transceiver once again continues Yaesu‘s legacy for legendary receiver... Read more
Details of the new Expert Sun MB1 SDR Transceiver. It covers 160m to 2m and delivers 125W on the HF bands and 60W on 2m. This radio is available from... Read more