b. General rules of radio transmission security are given below. Follow these
basic rules to ensure transmission security. These rules are strictly enforced on all
(1) No transmission will be made unless the proper authority authorizes the
The following practices are specifically forbidden:
(a) Violation of radio silence.
Unofficial conversation between operators.
Transmission on a directed net without permission.
(d) Excessive tuning and testing.
(e) Transmission of the operator's personal sign or name.
Unauthorized use of plain language.
(g) Use of other than authorized prowords.
(h) Unauthorized use of plain language in place of applicable prowords
or operating signals.
(i) Association of classified call signs and address groups with
unclassified call signs.
Profane, indecent, or obscene language.
c. Call signs are used in radio communications to identify a communications
facility, a command, an authority, or a unit. There are two forms of call signs: complete
call signs and abbreviated call signs.
(1) Complete call signs consist of a letter-number-letter combination and a
suffix. They are used when:
(a) Entering a net in which you do not normally operate.
(b) When so requested by another station in the net.
(2) Abbreviated call signs are used at all other times. For example, if
A2D28 were the complete call sign, then D28 would be the abbreviated call sign.