Hi friends, Just to clarify, the issue is not the identification interval... rather, the issue is whether *it is possible to identify at all*.
A callsign such as XX0YYYY is compliant with ITU Radio Regulations <https://life.itu.int/radioclub/rr/art19.pdf#page=7> (Article 19, 19.68), but as far as I can figure out it's not possible to identify with a callsign of that form using WSJT-X and WSPR (and I think it isn't possible to identify with any of the modes -- not even with the CW ID feature). Note that ITU regulations explicitly provide for up to *four* characters after the digit, and it is only the last character which must be a letter. For example, the callsigns K7123X, K7ABCD, and K722AX are all valid callsigns according to the ITU regulations. Furthermore, even longer callsigns are authorized Article 19 at 19.68A. ("On special occasions, for temporary use, administrations may authorize use of call signs with more than the four characters referred to in No. 19.68.") An example would be K7VERYLONGCALLSIGN -- perfectly compliant with ITU rules "on special occasions for temporary use". In some jurisdictions under some circumstances a license requires a fraction bar and additional characters after the callsign. In the U.S. -- and likely everywhere else -- national identification requirements can met by the transmission of the callsign in CW using International Morse Code. Notwithstanding any limitations in the 28-bit digital encoding scheme used for WSJT-X digital modes, a free-form CW ID callsign field would empower all users to perform their station identification duties -- something that is not currently possible with WSJT-X for some callsigns. David / K7DB
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