officer who exercises control of all frequency assignments in the
theater.
He assigns a specific frequency channel to each net under
his direct control. Each major subordinate Army headquarters then is
allotted a group or list of frequencies from which specific
assignments to radio nets may be made under the direct control of the
subordinate unit.
This process of allotting lists of frequencies
continues down through corps headquarters to division headquarters.
In general, the division signal officer (DSO) assigns specific
frequencies to many of the subordinate units within the division.
However, the DSO may suballot lists of FM channels to each infantry
battalion which, in turn, may assign a number of channels to use
within each company.
Since the distance range of combat radio sets
is relatively short, assign duplicate frequencies to companies
separated by a distance greater than 1 mile. When these assignments
are completed, each radio net in the theater of operations is
assigned an operating frequency.
The signal operating instructions
(SOI) of the assigning headquarters list radio frequency assignments.
An ideal frequency assignment is one that permits each net to operate
on its assigned frequency without causing interference to, or getting
interference from, another net. The first step in achieving this is
to assign different frequencies to all nets operating within the
interference range of each other. This is done by allotting selected
lists of frequencies to each assigning headquarters to keep
duplicated assignments to a minimum.
Obtain the radio frequencies
assigned to the different nets in a division from lists made
available by the Army.
These lists give the designated division
authorized frequencies.
You must assign appropriate frequencies, from the allotted list, to
each radio station and net within the division.
Ensure that these
assignments are published in the division SOI. When making frequency
assignments to specific radio nets, consider the compatible frequency
ranges of the various radio sets that may be used in the same net.
This will ensure that no frequency outside of this compatible range
is assigned to the net, even though the frequency is listed as
available.
The assignment of a different frequency to each net is not all that
is required to ensure interference-free operations.
Radio signals
may occupy less than 1 kilocycle (KC) or as much as several hundred
KCs on a receiver tuning dial.
For this reason, you must provide
adequate separation between adjacent radio frequency assignments.
Consider the following factors to determine adequate separation:
Type
of
emission
(continuous
wave,
voice,
or
radio
teletypewriter).
In
general,
the
separation
will
be
approximately the same for continuous wave and radio
37
TR1009
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