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(2) using AWB). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
Revision as of 08:42, 28 May 2010 by TreasuryTag(talk | contribs)(a [few] paltry change[s], typos fixed: etc
→ etc.
(2) using AWB)
Z Code (like Q Code and X Code) is a set of codes used in CW, TTY and RTTY radio communication. Actually, there are different sets of Z-codes: one originally developed by Cable & Wireless Ltd., 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 USSR's military and other operating agencies. The old C&W Z Codes are not widely used today.
Some Example Z Codes
Code
Meaning
ZAL
I am closing down (until...) due to....
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).
ZBK
Are you receiving my traffic clear?
ZBK1
I am receiving your traffic clear
ZBK2
I am receiving your traffic garbled
ZBM2
Place a competent operator on this circuit
ZSF
Switch off...(1. IFF; 2. IFF sets for 10 minutes in area denoted except for ships whose call signs follow).
ZBW no.
Change to backup frequency no.
ZBZ no(1-5).
An Indicator of Signal quality - RX you ZBZ5 etc.
In this example, the ZBK/1/2 is a Z code from the NATO military set, while the others are old C&W Z-codes. 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.),
