TM 11-5895-1412-12&P
d. FREQUENCY ASSIGNMENTS (Continued)
prevent interference.
The following section will describe the different types
of assignments.
1.
FREQUENCY ASSIGNMENT TYPES
A net may be sufficiently important to warrant a dedicated (sole user)
frequency for its use.
This frequency is unique to the organization and is
only used by one net during any time period.
Unlike a fixed frequency, the
sole user frequency assigned to the net changes with each time period. This
type of assignment is reserved for command and control nets.
When the number of nets requiring frequencies is greater than the number of
available frequencies, frequency reuse (common user) becomes a necessary
option.
Reuse frequencies are frequencies that are reused (shared on a
noninterference basis) by more than one net.
Nets are selected for inclusion
in a reuse plan on the basis of low operating power, geographic separation,
terrain masking and other factors permitting the use of the same frequencies
on a noninterference basis.
Another method of reducing the number of frequencies required is to share
frequencies.
A shared frequency is a frequency used by two or more nets. The
sharing nets will receive the same frequency for a given time period.
The
frequency can be fixed or discrete.
Typical nets using shared frequencies are
survey nets and weather nets.
G-6 FREQUENCY RESTRICTIONS PRACTICAL EXAMPLES
The following practical exercise is designed to test your understanding of
frequency restrictions.
There are three suggestions provided. Exercises 1
and 2 provide an understanding of the reverse logic system applied to
frequency restrictions.
Exercise 3 requires interpretation of an HF and VHF-
FM RFA, developing a frequency restriction explanation sheet and comparing
frequency restrictions against specific radio nets.
In exercises 1 and 2, you are given radio nets and frequencies. With each
radio net and frequency is an arbitrary restriction (A-P). You must determine
which frequencies are assignable to which nets.
Record your answers in the
column titled “Assignable Frequencies for Net”.
In exercise 3, you are given a sample HF and VHF-FM RFA and radio nets for the
1-78th Infantry Battalion.
After reviewing the RFAs, develop a restriction
explanation sheet for both RFAs.
Next, take the list identifying those radio
nets which require restrictions and complete the two columns on your list of
radio nets titled “RF BAND” and “Restrictions”.
G-5
