[Moon-net] WSJT 5.9.5

Sat Aug 5 04:54:30 CDT 2006

Hello Joe

I read with interest about the new version of WSJT 5.9.5 and in particular
about the enhancements of JT65 Deep Search Decoder. In order to understand
better the level and explanation behind improvements i visited your webpage
and more specifically the update history at:
http://pulsar.princeton.edu/~joe/K1JT/UpdateHistory.txt

In this context and in relation to your public post as well as the wording
given at the link above, given the controversy & challenges we have all
witnessed since DS was introduced from version 4.9.0 about 2 years back and 
until today, i
would like to ask you a few questions so we all can understand better how
those enhancements really work for the benefit of the user in relation to
preserving integrity & credibility of EME QSOs and existing requirements of
operating procedures:

1. You write in your webpage:
''Changes to the JT65 Deep Search decoder have made it slightly more
 sensitive, on average.  More importantly, the number of false
decodes has been dramatically reduced.  JT65 decoding can be as
much as 3 times faster than before.  For these reasons alone, you
should be sure to upgrade if you use JT65.''

Questions:
1. How has DS become more sensitive?
2. How has decoding become 3 times faster than before?
a.Is it through reducing the amount of information content being necessary
to decode?
b. Is it because the cloud of  callsigns (in calls3.txt file) is
significantly shortened so combination matches needed to be made are much
smaller, probability wise, as a distance of identified callsign elements
from the overall ''cloud''?
c. Other?
Could you elaborate for us in a simplified manner so that those interested
in the EME Community know and understand, apart from only looking at the end
result?

2.The sentence '' the number of false decodes has been dramatically
reduced'' made me seriously thinking. This is a responsible statement.

Questions:
a. Could you please enlighten us what was and how has the number of false
decodes progressed since version 4.9.0 and thereafter and what has the
number of false decodes become now?
b. How has this been achieved for v 5.9.5 vs previous versions?
c. Finally, since the number of false decodes in previous versions has been
dramatically higher what does this mean for JT65 DS QSOs in practise, those
having a dramatically higher number of false decodes in the last 2 yrs?

3. You write on your webpage:
''A more useful menu of JT65 decoding options is provided.  You may
 now select "No Deep Search", "Normal Deep Search", "Aggressive Deep
 Search", or "Include Average in Aggressive Deep Search".''

Questions
Could you please clarify - explain to us:
a. If no Deeep Search is used, does it apply in ALL possible cases
/senarios of callsign/locator combination?
b. What are the differences between the other 3 options in reality (Normal
Deeep Search, Aggressive Deeep Search, Include Average in Aggressive Deeep
Search) with respect to:
1. information content being necessary to decode/identify
2. n number of callsigns in the database?

Finally, could you please elaborate on Aggressive Deeep Search practical and
theoretical workings if possible in a manner easily understood by the
reader, with respect to:
a. random operation
b. sked function

Truth is that I expected to see a description covering those aspects in your
webpage (update history section). I did not find anything there, only what
JT65 under Deep Search achieves.
Therefore the reason i ask those questions is that for even a skeptical 
current
or future user in terms of EME QSO integrity with JT65 Deep Search function,
to be able to understand how programm works in reality, so as to know what
he is really doing by using it, or take the decision to use the certain DS 
function or not.

Thank you for your time and looking forward to familiarize myself better
with JT65, using DS, current developments.

73,
Jimmy SV1BTR

----- Original Message ----- 
From: "Joe Taylor" <joe at Princeton.EDU>
To: "Moon-Net" <moon-net at list-serv.davidv.net>; <wsjtgroup at yahoogroups.com>;
<hsms at mailman.qth.net>; <wsjt-devel at lists.berlios.de>; "Udo Langenohl -
DK5YA" <dk5ya at dk5ya.de>; "Al Katz" <a.katz at ieee.org>
Sent: Thursday, August 03, 2006 5:53 PM
Subject: Re: [Moon-net] WSJT 5.9.5

> To:      Users of WSJT
> From:    Joe Taylor, K1JT (for the WSJT Development Group)
> Subject: WSJT 5.9.5, r236
>
> WSJT Version 5.9.5, r236, is now available for free download from
> http://pulsar.princeton.edu/~joe/K1JT/WSJT595.EXE.
>
> The most important change from previous versions is a significant
> improvement to the JT65 Deep Search decoder resulting in a big reduction
> in the number of false decodes.  The decoder is also faster.
>
> Mode JT65C has been enhanced in other ways that make it more effective
> for 1296 MHz EME.  VK7MO (2.3 m dish) tells me that he and VK4AFL (3.7 m
> dish) used it last night to make an easy QSO using 10 Watts at each end,
> with the Moon close to apogee.
>
> On your first program start-up using version 5.9.5, be sure to enter
> your correct PTT port number on the Setup | Options page.  Under Linux
> or FreeBSD, enter the appropriate device name, for example /dev/ttyS0.
>
> An expanded list of additions, changes, and bug fixes is available at
> http://pulsar.princeton.edu/~joe/K1JT/UpdateHistory.txt.
>
> As always, the WSJT developers will be happy to receive your feedback on
> this new release.  You can send email to me or to wsjt-devel at berlios.de.
>
> A new WSJT manual is also in the works.  I hope it will be available soon.
>             -- 73, Joe, K1JT
>
> _______________________________________________
> Moon-Net posting and subscription instructions are at
> http://www.nlsa.com/nets/moon-net-help.html
>