?Hello,
I hope I am at the right place with my question (if not so, please let me know
where I need to be).
I am using JT9 on the 630 meter band (472-479kHz), it is an excellent mode to
work distant stations. But even with JT9 is is very difficult to cover
distances of over 5000km.
At these wavelength it is a hard job to get some signal radiated (antennas are
very small compared to then wavelength), so most stations have an ERP of less
than 1W.
In addition, depending on the countries, there is a ERP limitation between 1
and 5 W EIRP. So increasing the radiated signal is often not an option.
In an early version of WSJT-X several "flavours" of JT9 were available: JT9-1
(1 min sequence), JT9-2 (2 minutes sequence) and JT9-5 (5 minutes sequence).
JT9-2 would give an extra 3dB (more or less), very often the difference between
success and failure on 630m DX.
I believe JT9-2 and JT9-5 were abandoned because there were issues with the
doppler shift and multi-path propagation on HF, but this is less critical on
lower frequencies and on 630m at least JT9-2 was very useful.
Question 1: Is the early version of WSJT-X (that supports JT9-2 and JT9-5)
still available somewhere?
Question 2: Would it be feasible to implement JT9-2 and eventually JT9-5 in a
new version of WSJT-X? This would also take advantage of the decoding
improvements made the last years.
73,
Rik, ON7YD - OR7T
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