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I caught this in FT8, did someone just enter <...> as their call sign or is this code for something?

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From the WSJT-X documentation:

Angle brackets imply that the enclosed callsign is not transmitted in full, but rather as a hash code using a smaller number of bits. Receiving stations will display the full nonstandard callsign if it has been received in full in the recent past. Otherwise it will be displayed as <...>.

https://wsjt.sourceforge.io/wsjtx-doc/wsjtx-main-2.7.0-rc2.html#COMP-CALL

This is an interesting read about FT8 callsign hashes: http://www.dx.nl/?p=1478

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