272335Z FEB 2022
TO: ALL STATIONS
FROM: ALPHABET
ANZJXH // SEZDK CTJNN 6KV2M SAVQU YNFA
This is a recycled callsign, this callsign was also used for all messages on Dec 13, 2018.
I have seen a few callsigns get recycled, but it appears to be uncommon to do so.
T!
They are not exactly recycled. The appropriate call sign book has hundreds of call signs in what I call a "pool". The assignment of these call signs is randomly generated using the same pool of words every 24 hour period starting a 00Z. If you track the call signs you will notice the same words come up often. You might hear a call sign on one day and hear it again the next day used by someone else, or you might not hear a repeat for 6 months or a year. Its all just part of the random assignment "machine". The benefit of a pool of call signs that are reserved for this process is that the same words (in theory) are assigned to no one else outside this system to avoid conflicts.
I like to refer to this as a "call sign book," because that is the way its used to be, paper books distributed weeks to months in advance. I'm sure now the daily assignments are distributed via electronic means, but the call sign system is the same.
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