TM 11-5820-890-10-1
SECTION IV. FREQUENCY HOPPING OPERATING PROCEDURES
ITEM
PAGE
Scope
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2-35
Loading FH Data (local fill) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-35
Clearing FH Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-37
Loading COMSEC Keys (local fill)
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2-38
Basic COMSEC Procedures
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2-39
Pre-mission Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-40
Net Opening.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-41
Cold Start Net Opening
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2-41
FH Update Using ERF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-44
Cue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-45
Late Net Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-45
Passive
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2-45
CUE and ERF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-46
Jamming and Antijamming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-47
This section contains information on FH operation. Operation in FH is different than
SC operation in which only one frequency is used to communicate. FH is a preferred
method of communication because it offers resistance to jamming and enemy direc-
tion finding equipment. SINCGARS offers the new capability of using 2,320 frequen-
cies over a short period of time. In fact, when SINCGARS is operating in FH, it
changes frequencies more than 100 times per second, making it difficult to jam.
Preparation for FH operation includes FH data loading and pre-mission check to en-
sure mission success. If you will be communicating in a net using secure communica-
tion, you must load COMSEC keys and be familiar with basic COMSEC procedures.
if communication is lost while operating in a FH net, refer to the late net entry proce-
dures for information.
An ECCM fill device is used to load FH data into the RT. There are 15 labels on the
side of the fill device that lists information about the data that is stored in the fill device
memory. Each label represents a position where the data is stored. Specific data
is selected by setting the fill device SELECT switch to the label position of the desired
data. The NCS will tell you which data to select and where to store it in your RT.
2-35
