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
The Omnia SDR Basic is a reintroduced Peaberry V2 by permission from David Turnbull (AE9RB). The Peaberry SDR V2 is a Software Defined Radio transceiver for the HF amateur bands (FCC part 97). It’s available as a kit that you build yo... Read more
Product Description Place of Origin Fujian, China (Mainland) Brand Name VGC Model Number VR-6600PRO Type Vehicle Mouted Dimensions 157 X 66 X 33.5mm Frequency Range 136-174MHz/222-225MHz/400-480MHz/480-520MHz Storage Channel 1000 Talk Range... Read more
ORLANDO, Fla. — OrlaThe man has climbed the tower outside of the WKMG studios on John Young Parkway.ndo police have been called to a local TV station... Read more
Flex-6400M and Flex-6600M Read more
“KM4IPF, AE4FH, and WX4TV are planning a mini DXpedition to the Dry Tortugas later this year and we are building an HF go box to hold the Yaesu... Read more