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Wikipedia / Z code

ZCode (like Q Code and X Code) is a set of operating signals used in CW, TTY and RTTY radio communication.

Distinct versions

There are at least three sets of Zcodes.

  1. {|

|- style="vertical-align:top;" | 1. | One set of codes was originally developed by Cable & Wireless Ltd. (the Cable & Wireless Service Zcode) for commercial communications in the early days of wire and radio communications.

Many of the old C&W codes are derived from mnemonics

  1. (ZAL = alter wavelength,ZAP = ack please,ZSF = send faster, etc.)

The old C&W Zcodes are not widely used today. |- style="vertical-align:top;" | 2. | APCO also developed a system of Zcodes. |- style="vertical-align:top;" | 3. | NATO forces independently developed a later set of Zcodes for military use and inter-language needs. The NATO Zcodes are still in use, and are published in the unclassified document ACP-131. |}

There are other sets of codes internally used by Russia's military and other operating agencies.

Examples

  1. {| class="wikitable"

|+ |- ! Code ! Meaning ! Source |- | | I am closing down (until ...) | C&W |- | ZAP ... | Work ...

  1. 1. Simplex;2. Duplex; 3. Diplex; 4. Multiplex; 5. Single sideband; 6. With automatic error correction system; 7. Without automatic error correction system. 8. With time and frequency diversity modem

| C&W |- | ZBK | Are you receiving my traffic clear? | NATO |- | ZBK1 | I am receiving your traffic clear | NATO |- | ZBK2 | I am receiving your traffic garbled | NATO |- | ZBM2 | Place a competent operator on this circuit | C&W |- | ZBW... | Change to backup frequency... | C&W |- | ZBZ... | Measure of printability

  1. 1=Garbled / unreadable, up to 5=Perfect

| C&W |- | ZLD2 | I cannot transmit pictures | C&W |- | | Switch off... (except...)

  1. 1.IFF;2.IFF sets for 10minutes in area denoted except for ships with the following

| C&W |- | ZUJ | Stand by. | NATO |}

See also

References