Z code

Z Code (like Q Code and X Code) is a set of operating signals used in CW, TTY and RTTY radio communication. Actually, there are different sets of Z-codes: one originally developed by Cable & Wireless Ltd. (the Cable & Wireless Service Z-Code), for commercial communications in the early days of wire and radio communications, another one independently developed by NATO forces later for military needs and use. The NATO Z Code is still in use today, and is published in the unclassified document ACP-131. There are other set of codes internally used by Russia's military and other operating agencies. The old C&W Z Codes are not widely used today.

A lot of the old C&W codes are derived from mnemonics (ZAL = (a)lter wave(l)ength, ZAP = (a)ck (p)lease, ZSF = (s)end (f)aster, etc.

See also

  • ACP-131

    • External links

  • Ralf D. Kloth DL4TA - List of Z-codes
  • ACP 131(F) - Communications Instructions Operating Signals
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