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JT65 protocol, Version 2.0

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  • Joe Taylor
    To: Users of the JT65 protocol From: K1JT and W6CQZ Subject: JT65 v2.0 A limitation of JT65 s structured message protocol has always been that compound
    Message 1 of 1 , Jan 25, 2012
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      To: Users of the JT65 protocol
      From: K1JT and W6CQZ
      Subject: JT65 v2.0

      A limitation of JT65's structured message protocol has always been that
      compound callsigns such as 3B9/K1XYZ or VE3ABC/W9 are accommodated
      gracefully only if the add-on prefix or suffix is one of about 350
      stored in a program table.

      We are presently implementing version 2.0 of the JT65 protocol in the
      widely used programs WSJT, MAP65, and JT65-HF. The new version is fully
      backward-compatible with the presently used JT65 protocol (which now
      might be called "JT65 version 1.0"). In addition, it supports messages
      of the form

      CQ pfx/callsign grid
      QRZ pfx/callsign grid
      DE pfx/callsign grid

      CQ callsign/sfx grid
      QRZ callsign/sfx grid
      DE callsign/sfx grid

      where "pfx" is a 1-4 character prefix, "callsign" is a standard callsign
      as used in JT65 structured messages, "sfx" is a 1-3 character suffix,
      and "grid" is a 4-character Maidenhead locator. As in protocol version
      1.0, you may substitute a signal report of the form "-nn" or "R-nn", or
      the brief messages "RRR" or "73" for the grid locator.

      When programs supporting the new protocol are released, users of older
      versions may see unexpected results (such as ".....") when receiving a
      compound callsign with prefix or suffix not in the original tabulated
      list. For this reason, upgrading to a new version will be desirable.

      Suitable announcements will be made when new program versions are
      available. In the meantime, this message can serve as a preview of
      what's coming.

      -- 73 from Joe Taylor, K1JT and Joe Large, W6CQZ.
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