WSJT9.7 Update

WSJT 65 (and variants) Discussion

WSJT9.7 Update

Postby VK4UH » Fri Jan 31, 2014 11:47 pm

IN case anyone has not spotted this upgrade to the WSJT suite of programs. The latest version 9.7 has appeared from the usual site

WSJT 9.7 is the latest version of the familiar weak-signal communication program WSJT. Until
a complete WSJT 9 User’s Guide is available, the present document should be read in
conjunction with the older WSJT6 User’s Guide and Reference Manual, most of which is still
New features in WSJT 9 (relative to WSJT 6 and WSJT 7) include the following:
1. New Modes
a. ISCAT is a new mode that replaces JT6M. It has significantly better performance
on the propagation paths where JT6M has been popular, such as tropospheric
and ionospheric scatter and weak Es or F2 on 6 meters. If you liked and used
JT6M, you will like ISCAT even better.
b. JTMS is a new mode for meteor scatter. It uses a variation of FSK called
Minimum Shift Keying (MSK), which allows a faster transmission rate per unit
bandwidth. Extensive tests show that JTMS performs slightly better than
FSK441, especially with very short pings. It also tends to produce cleaner
decodes and less on-screen “garbage”.
c. Echo mode has been missing in recent versions of WSJT, but is re-introduced in
WSJT 9. It allows testing for echoes of your own signal from the moon.
2. Enhancements to FSK441: an improved decoder does a better job of (1) determining
frequency offset DF and (2) rejecting non-FSK441 signals and noise spikes, thereby
producing fewer “ garbage” decodes. Sensitivity to legitimate FSK441 signals is
3. T/R period for ISCAT is normally 30 seconds, the same as for FSK441. However,
WSJT 9 also supports optional T/R sequence lengths of 15 s for both FSK441 and
ISCAT modes. The shorter sequences may be useful in particular situations such as
contests, multi-hop Es, etc.
4. Message Templates: the Setup | Options screen offers an improved user interface for
setting your preferences for templates that generate messages for the FSK441 and
ISCAT modes.
5. Lunar Librations cause EME signals to exhibit fading at VHF/UHF frequencies and
Doppler spreading at higher microwave frequencies. WSJT 9 computes these effects in
real time and displays the expected frequency spread both for your own echoes and for
the DX station. Fading timescale is the inverse of frequency spread.
6. User interface has been cleaned up and simplified in several ways. In general, only
those controls relevant to the selected mode appear on screen.

Kevin (KJ) VK4UH
Forum Diehard
Posts: 255
Joined: Wed Apr 14, 2010 12:26 am

Re: WSJT9.7 Update

Postby VK4UH » Sat Feb 01, 2014 1:46 pm

Noone seems to be having any problems getting this version to run

Has anyone got the 9.7 version running with MSRX yet?

V 9.7 seems to be writing its .wav files, which MSRX then reworks, to a different location than earlier versions

Kevin VK4UH
Kevin (KJ) VK4UH
Forum Diehard
Posts: 255
Joined: Wed Apr 14, 2010 12:26 am

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