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TM 11-5820-890-10-8
FREQUENCY HOPPING (FH) COMMUNICATIONS
4.3.
Capabilities
4.3a.
In the frequency hopping (FH) mode of operation, the SINCGARS radio
FREQUENCIES
transmits and receives on any or all of the 2320 frequencies, with 25
KHz separation, in the 30.000 to 87.975 MHz range. For best results,
1200 or more of the total 2320 frequencies are normally used.
In the FH mode, the SINCGARS radio uses, "hops on," over 100
HOPPING
frequencies per second.
For two or more radios operating in the FH mode to communicate, it is
COMMUNICATING
essential that they contain the same set of frequencies and other
variables, commonly referred to as "FH Data".
Frequency Hopping (FH) Data
4.3b.
Frequencies made available for a SINCGARS radio to hop on are called
HOPSET
a "Hopset." A typical hopset consists of what remains of the total 2320
frequencies after protected frequencies, such as commercial
television, are removed. Protected frequencies are frequently referred
to as "Lockouts." In any case, except for technical purposes, lockouts
are treated as an integral part of the hopset.
The pattern in which the radio selects frequencies to hop on is
TSK
pseudo-random, as determined by the transmission security key
(TSK). Depending upon the number of frequencies available for
hopping and the TSK itself, the exact sequence of frequencies used
during any one second will not be repeated for long periods of time.
The remaining variable required for two or more frequency hopping
NET ID
radios to communicate is called the "Net ID." It is a three-digit number,
000-999, which controls where in the pseudo-random sequence the
radio begins to hop.
In shot-t, the term FH Data refers to:
Hopsets (with Lockouts
FH DATA
integrated), TSK, and Net ID.
Typically, division-sized units use the same Hopset and TSK for all
COMMONALITY
their SINCGARS frequency hopping nets. On the other hand, each net
is assigned its own Net ID.
4-6


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