[Moon] Re: Reply to Peter SM2CEW

[Doug Allen]

I have received several thoughtful replies from W5UWB, KB8RQ, and VK7MO
suggesting that the "tightening" I anticipated is already a feature of the
newest version of WSJT and that the bogus calls I received were followed by
a ? which is a giveaway that they are bogus.  Yes, I remember that from
September.  Other worth while points were also made, including that there
are a number of "confidence checks" such as sync levels to gain whatever
level of confidence you are comfortable with.  Thus, it comes down to
personal integrity which was always the case.  I also understand that during
my several year absence from EME all of this has been discussed ad nauseum.
So perhaps we should move on to other subjects now.
73,
Doug W0AH


On 2/8/07, Doug Allen <dougw0ah at gmail.com> wrote:
>
> Peter, SM2CEW, describes JT-65 in a way that makes me question the
> validity of JT-65 contacts, but I am not competent to discern whether his
> software description is accurate. I have operated meteor scatter for 43
> years. For almost a decade during the 1990's, I operated conventional CW EME
> with high power and a four 5 wl 2M yagi az-el array. For several of those
> years, I was editor/publisher of the "EME Newsletter" which had subscribers
> from over 30 countries. The EME operating procedure we all used was adapted,
> I think, from meteor scatter operating procedures, and was uncontroversial.
> I had little reason to publish anything about it during those years.
>
> I first used digital high speed meteor scatter in the early 1990's with
> software that preceeded Joe Taylor's WSJT, and I have used WSJT FSK-441 from
> the beginning, making the first meteor scatter contacts with it, I believe,
> from Mexico and from Belize in the 1990's. I think FSK-441 is a wonderful
> advance in technology making meteor scatter communication possible with
> modest stations at any time. I continue to use it and think Joe Taylor has
> made a wonderful contribution to amateur radio. WSJT is a free program used
> by thousands. Thank you Joe!
>
> Recently, I have made a number of JT-65 EME contacts with 600 watts and a
> 2M 5 wl yagi from my new SC QTH. The decoding sometimes did not convince me
> that I had made a solid contact. Let me give a related observation. Several
> times I ran JT-65 in AUTO mode with message # 6, "CQ W0AH EM85," BUT WITHOUT
> ACTUALLY TRANSMITTING. Without transmitting, I have received up to a half
> dozen calls with signal reports from different stations in one hours time!
> Obviously, JT-65 decodes a lot of misinformation from white noise. I will
> leave others to evaluate the significance of this observation, but I wonder
> if Joe might not "tighten" the decoding thresholds a bit in order to make
> the software receive parameters more analogous to the aural reception
> parameters of conventional CW EME, thus addressing Peter's criticism while
> at the same time satisfying, I would hope, the many dedicated users of the
> software?
>
> Doug Allen W0AH EM85  Inman, SC
>
>
> --
> Doug Allen
> Here's a new webpage I'm working on:
> http://DougW0AH.googlepages.com/home<http://dougw0ah.googlepages.com/home>
>
> And here's the 73 CIRCLES blog-
> http://73circles.blogspot.com/




-- 
Doug Allen
Here's a new webpage I'm working on:
http://DougW0AH.googlepages.com/home

And here's the 73 CIRCLES blog-
http://73circles.blogspot.com/
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