WORD OR PHRASE
Communication is difficult.
phrase (word or code group) twice.
(This proword may be used as an order,
request, or information.)
Your last transmission was incorrect; the
correct version is ----------
They are the
heading, the text, and the ending, discussed in subparagraphs a, b, and c.
a. The heading always includes the call. An example is
IS--MAPLE 7--MESSAGE FOLLOWS.
HICKORY 6 is the call sign
of the station
called, THIS IS is a proword found in every transmission,
MAPLE 7 is the
call sign of the calling station, and MESSAGE FOLLOWS is a
just before the text of the message begins.
b. The text may be in plain language, code, or cipher groups.
c. The ending of a transmission may include authentication if being
used, and concludes with either "over" or 'but," never both. Either "roger"
or "wilco," to acknowledge receipt of the message, may precede "over" or
Before signal systems and communication facilities are restored to
a single track in each direction for alternate periods. For an unspecified
length of time, all trains travel westward, for example, and when such
movements have cleared the main at the westward point, trains start moving
in the opposite direction. Assume a section of railroad runs from A to H.
Imagine that A represents a port with a rail terminal, and that H represents
a railhead 60 kilometers to the west with a capacity of 10 trains of a given
Arrangements might be made to run cars amounting to 60 or 70
percent of A's storage capacity.
Each westbound train operated would be
classed as an extra and would carry running orders