[Moon] Re: Reply to Peter SM2CEW

[Lars Pettersson]

Yeahhh Let `s do EME the real way, using the human brain and CW
73 de Lars SM4IVE
  ----- Original Message ----- 
  From: Doug Allen 
  To: microwave at echo.valinet.com ; moon at moonbounce.info 
  Sent: Friday, February 09, 2007 4:09 AM
  Subject: [Moon] Re: Reply to Peter SM2CEW


  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 

    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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