communication instructions radio telegraph procedure

UNCLASSIFIED ACP124 (D)
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sign of the calling station, it shall answer immediately by transmitting the prosign AA followed by DE,
its own call sign and prosign K.
EXAMPLE: (NPQS hears its own call sign but misses the call sign of the
calling station.)
NPQS transmits:
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AA DE NPQS K
309. TUNING STATIONS ON A NET
a. Tuning several stations when establishing a net, or tuning one or more stations joining a
net, is known as "NETTING". Ordering and controlling NETTING is a responsibility of the Net Control
Station.
b. The type of procedure required to establish a net varies with the type of radio equipment
used on the net. Types may fall into various categories which may include:
(1) Self-tuning sets
(2) Sets requiring a tuning signal form the Net Control Station.
c. The operating signals ZRF, ZRC, ZGE and ZRA are used for tuning (see ACP 131 for
meanings).
d. Self-tuning sets. At the appointed time all stations on the net prepare their equipment for
use and select the specified frequency. Net Control Station then calls all stations, instructing them to
tune antennae, and, after a pause to allow stations to tune their equipment, ascertains the strength of
signals and readability of the net.
e. The Net Control Station is responsible for having its transmitter accurately turned to the
assigned frequency. Each subordinate station must tune to the Net Control Station even if the Net
Control Station is off frequency. If this is the case, the subordinate station(s) should inform the Net
Control Station, using appropriate operating signals.
f. Prior to opening a net, preliminary adjustment to transmitter and receiver can be made,
using a dummy or phantom antenna on the assigned frequency. Then, at the appropriate time, the
receiver can be zero beat with the Net Control Station and the transmitter tuned to the receiver in a
minimum amount of time on the assigned frequency, taking care that there is no possibility of infringing
the emission policy in effect.
EXAMPLE: (NPQR (THE Net Control Station) wishes to tune 2SN7.)
He transmits:
2SN7 2SN7 DE NPQR NPQR ZRF ZRC2 -NPQR NPQR (repeated for
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20 secs, then depress key for 10 secs) AR
After a pause to allow stations to tune their equipment:
2SN7 DE NPQR ZGE2 K
UNCLASSIFIED 3-5