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TM 11-5821-333-12
Section Ill. TECHNICAL PRINCIPLES OF OPERATION
Subject
Para
Audio Signal Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Data Operation with Data Rate Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
FH Sync Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-15
Frequency Hopping Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Frequency Hopping Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Homing Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Loading Operating Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-22
Remote Control Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
Retransmit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
Single Channel Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Voice Operation with KY-58 COMSEC Equipment . . . . . . . . . . . . . . . . . . . . . . 1-18
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1-12
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1-14
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1-12. GENERAL.
a. Keyboard Operations. The keyboard is provided as an interface between the operator and the RT.
By using the keyboard, the operator can enter numerical information such as frequencies to be used and where
to store those frequencies in the presets provided. Functions may also be performed by use of the appropriate
keys on the keyboard. For example, information maybe stored impermanent memory, retrieved into holding
memory from permanent memory, and sent to other radio sets by use of the function keys.
b. Offsetting a Frequency. A frequency can be offset by +5 or +10kHz using the RT keyboard.
c. Clearing a Frequency. A frequency can be cleared byloading a new frequency or by loading a single
zero.
d. Keyboard Display. The display responds when a procedure is performed and tells you what you must do
next.
1-13. SINGLE CHANNEL MODE.
In the single channel (SC) mode, your radio operates on one selected frequency, Up to eight single channel
frequencies can be loaded into your RT. These eight single channels are CUE, MAN, and six preset channels.
The operating frequency is selected using the PRESET switch.
1-14. FREQUENCY HOPPING MODE.
Frequency hopping (FH) limits the ability of enemy forces to use electronic countermeasures. Their ability to find
your location using direction finding equipment and their ability to jam your transmissions are both greatly re-
duced.
During FH operation, your radio changes frequency approximately 100 times per second. It can hop from be-
tween 1 to 2320 individual frequencies, A band of frequencies from 30 to 87.975 MHz is available in 25 kHz steps.
Both the transmitting FH radio and the receiving FH radio jump in an identical sequence. The net FH radios use
the following FH data to synchronize hopping:
h o p s e t
lockout set(s), if needed
Net ID
Transmission Security (TRANSEC) variable or Transmission Security Key (TSK)
F H s y n c t i m e
A hopset is the group of frequencies which the radio may use. A lockout set prevents the RT from using unavail-
able frequencies. The Net ID is a number which is unique to one net and determines where in the hopset the
hopping sequence starts. The TRANSEC variable (or TSK) controls the hopping sequence. The FH sync time is -
used to synchronize the clocks in all radios in a particular net.
The FH data must be loaded into your RT before FH net operation is possible. The data is loaded locally using
electronic local fill and remotely using Electronic Remote Fill (ERF). In Non-lCOM radio sets, the TRANSEC vari-
able is loaded locally only. In ICOM radio sets, the TRANSEC variable is called TSK and is loaded with the hopset.
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