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Z Code (like Q Code and X Code) is a set of operating signals used in CW, TTY and RTTY radio communication.
Distinct versionsEdit
There are at least three sets of Z codes.
1. One set of codes was originally developed by Cable & Wireless Ltd. (the Cable & Wireless Service Z code) for commercial communications in the early days of wire and radio communications. Many of the old C&W codes are derived from mnemonics
- (ZAL = alter wavelength,
ZAP = ack please,
ZSF = send faster, etc.)
The old C&W Z codes are not widely used today.
2. APCOTemplate:Clarify also developed a system of Z codes.<ref>{{#invoke:citation/CS1|citation CitationClass=web }}</ref>
3. NATO forces independently developed a later set of Z codes for military use and inter-language needs. The NATO Z codes are still in use, and are published in the unclassified document ACP-131. - (ZAL = alter wavelength,
There are other sets of codes internally used by Russia's military and other operating agencies.
ExamplesEdit
Template:Big Code Meaning Source Template:Nobr I am closing down (until ...) Template:Nobr C&W ZAP ... Work ... - 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 ZBK 1 I am receiving your traffic clear NATO ZBK 2 I am receiving your traffic garbled NATO ZBM 2 Place a competent operator on this circuit C&W ZLD 2 I cannot transmit pictures C&W Template:Nobr Switch off ... (except ...) - 1. IFF;
2. IFF sets for 10 minutes in area denoted except for ships with the following Template:Nobr
C&W ZBW ... Change to backup frequency ... C&W ZBZ ... Measure of printability - 1=Garbled / unreadable, up to 5=Perfect
C&W ZUJ Stand by. NATO - 1. Simplex;
See alsoEdit
ReferencesEdit
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