TM 11-5820-890-10-3
SECTION IV. FREQUENCY HOPPING OPERATING PROCEDURES
ITEM
PAGE
Scope .................................................................................................................................................................................. 2-36
Loading FH Data (local fill) .................................................................................................................................................. 2-36
Clearing FH Data................................................................................................................................................................. 2-38
Basic COMSEC Procedures ............................................................................................................................................... 2-39
Pre-mission Check .............................................................................................................................................................. 2-40
Net Opening ........................................................................................................................................................................ 2-41
Cold Start Net Opening ....................................................................................................................................................... 2-41
FH Update Using ERF......................................................................................................................................................... 2-44
Cue ...................................................................................................................................................................................... 2-45
Late Net Entry...................................................................................................................................................................... 2-45
Passive ................................................................................................................................................................................ 2-45
CUE and ERF...................................................................................................................................................................... 2-46
Jamming and Antijamming .................................................................................................................................................. 2-47
SCOPE
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 direction finding equipment. SINCGARS offers the new capability of using 2, 320 frequencies 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 premission check to ensure mission
success. If you will be communicating in a net using secure communication, you must use the KY57. Refer to basic
COMSEC procedures.
LOADING FH DATA (LOCAL FILL)
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 list
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.
2-36
