The sub-modes with longer transmissions trade reduced throughput for smaller bandwidth and increased sensitivity. The remaining JT9 submodes take proportionally longer, so JT9-1 is the preferred submode under most circumstances. A minimal QSO with JT9-1 usually takes 4 to 6 minutes: 2 or 3 transmissions by each station, one transmitting in odd minutes and the other even. JT9 offers five choices for the sequence durations: submodes JT9-1, JT9-2, JT9-5, JT9-10, and JT9-30 use 1, 2, 5, 10, and 30 minutes, respectively. Thanks Arthur and a LOTW entry is on the way for you.Īll WSJT modes use timed sequences of alternating transmission and reception. Arthur was running 50 watts and I was running 10 watts into a PAR 6 meter Moxon antenna. Again yesterday, I worked K0KUK up on 6 meters during a nice E-skip opening into Wisconsin and Minnesota. I can vouch for the weak signal capability of the new JT9-1 mode. World-wide QSOs are possible with power levels around 1 W and compromise antennas, and several dozen JT9 signals fit easily into a 1 kHz slice of spectrum. JT9 is about 2 dB more sensitive than JT65A while using less than 10% of the bandwidth. In contrast, JT9 is optimized for HF and lower frequencies.
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JT65 was designed for EME on the VHF/UHF bands and has also proved very effective for worldwide QRP communication at HF JT4 is used mainly on the microwave bands. They use nearly identical message structure and source encoding.
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All three modes are designed for making minimal QSOs under extreme weak-signal conditions. JT9 shares many characteristics with the modes JT65 and JT4 made popular in WSJT.
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Work the world with jt65 and jt9 pdf software#
This new version of Joe's popular WSJT software series offers a new mode called JT9, designed for use on the LF, MF, and HF bands. This new package has been modernized and has the look and feel of Joe Large W6CQZ JT65-HF package. Joe Taylor K1JT, has released a new version of his WSJT-x (v0.95, r3251) software package yesterday (May 2) and JT9 fans will love it.