Z-Signals Are Completely Different from the Old Cable & Wireless Codes
Z Codes – Military and Commercial Z - CODES - Military & Commercial Z-Codes are mainly used over commercial and military teleprinter, facsimile and high speed automatic telegraphy links and are not normally used by Radio Amateurs, even when using RTTY, but the list is included for general interest. The list and usage data was compiled by Ralf D.Kloth, DL4TA, and is reproduced here with his kind permission. I am grateful to Ralf for this, as he spent a considerable amount of time and effort researching various sources in order to produce his list. The Z-Code was originally developed as a service code by Cable & Wireless Ltd. for usage in the commercial communications business. NATO military Z-signals are completely different from the old Cable & Wireless codes. The NATO military Z-signals, ZAA...ZXZ, are defined in ACP 131, but the series ZYA...ZZZ is reserved for the temporary or permanent assignment of meanings on an intra-military basis by any nation, service or command. In the following table, a non-annotated code denotes the original Cable & Wireless usage, * indicates NATO military usage (ACP- 131(E), 1997) and ** indicates Russian military usage. As the majority of Z-Codes are not normally used as questions, their meanings are given with the answer, advice or information form shown first, with the question form shown in a second column, if appropriate. Z signals shall be read as questions when followed by the interrogation signal (IMI) in civil use or preceded by the prosign (INT) in NATO military use. Note that the numbers 1...5 following a Z signal have the following meanings:- (1) very slight (2) slight (3) moderate (4) severe (5) extreme Code Advice Information or Answer Question ZAA* You are not observing proper circuit discipline.
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