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3833Re: [wsjtgroup] JT65A protocol

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  • Joe Taylor
    Jul 16, 2007
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      Graeme --

      The information provided by WSJT under "Help -> What message
      to send?" (F5) and "Help -> Examples of minimal JT65 QSOs"
      (Shift+F5) is based on standard EME practice. When making
      EME QSOs operators are do not consider a contact to be valid
      until a minimum of both callsigns and a signal report (or
      some other information) and acknowledgments have been exchanged.

      Recently many people have been having fun with JT65A on the
      HF bands, and some have not learned (or do not wish to
      follow) these conventions.

      In "minimal EME" language: "O" (sometimes written "OOO",
      since in EME everything is usually repeated many times) is a
      signal report. It means that signals are good enough that
      both callsigns have been copied, and it is not sent until
      that is the case. When you have copied both callsigns and
      "O" from the other station you send "R" (perhaps combined
      with "O", if you have not previously sent your report).

      So no, it is NOT conventional for both stations to send OOO.
      The convention for a minimal QSO is like the example given
      in WSJT:

      ##############################################################
      Station #1 Station #2
      -----------------------------------------------
      CQ K1JT FN20
      K1JT DL3XYZ JO61
      DL3XYZ K1JT FN20 OOO
      RO
      RRR
      73
      ##############################################################

      In this minimal QSO, both stations have copied two
      callsigns, a report, and an acknowledgment that all has been
      copied.

      In HF usage the second QSO format shown in the WSJT example
      is more common, I believe, and I recommend it. Recently it
      is becoming more common in EME work, as well.

      ##############################################################
      Station #1 Station #2
      ----------------------------------------------------------
      CQ K1JT FN20
      K1JT VK7ABC QE37
      VK7ABC K1JT -22
      K1JT VK7ABC R-23
      VK7ABC K1JT RRR
      TNX JOE 73
      ##############################################################

      Of course, there is no reason that you MUST follow any
      particular convention ... especially when signal levels are
      not really marginal.

      -- 73, Joe, K1JT

      zl1gbb wrote:
      > Can anyone give me a bit of advice re what is the correct way to
      > carry out a JT65A contact? I have been following the advice in the
      > Help section regarding what is a contact. This is what the Help says:
      >
      > ...less than both calls, send both calls and your grid locator.
      > ...both calls, send both calls, your grid locator, and 000.
      > ...both calls and 000, send R0.
      > ...R0, send RRR.
      > ...RRR, the QSO is complete. However, the other station may not know
      > this, so it is conventional to send 73 to signify that you are done.
      >
      > My problem is that no-one seems to stick to this. I sit there waiting
      > for a '000' and the next thing I get is '73'. Surely BOTH parties
      > send '000'? And, BOTH parties send 'R0'? What do these mean, anyway?
      >
      > It also says that you can send sig. reports as substitutes for Grid
      > Locators. At some time in the QSO, grid locators are needed for the
      > log. So which grid locator can you substitute with sig. report? I
      > mean, if I reply to someone calling CQ, surely I should NOT subtitute
      > as it will be the only time that I will be sending my grid locator.
      >
      > 73 Graeme zl1gbb
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