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Initiates entry into transceiver of all valid complete entries by keyboard entry. Stores a
received hopset or lockout set held in holding memory.
Initiates transfer of ECCM parameters to transceiver. Enter O in the same manner as
other keyboard numbers.
Clears partial or erroneous entries.
Adjusts receiver volume.
To enter ECCM variables from an external fill device.
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TM 1-1520-238-10
3.10.3 Modes of Operation.
a. ECCM Mode. The ECCM mode provides a jam
resistant capability by means of a (FH) technique that
changes frequency many times a second. Automatic frequency
changing in an apparently random manner provides
the jam resistance of the radio. This capability
permits communications in radio jamming environments.
For uninterrupted successful communications,
radios must be time synchronized with each other and
share a common net.
(1) Time Synchronization. Time synchronization
is provided by a clock inside the radio set. The operation
of the (FH) net is time dependent and the accuracy
of time, as it is registered in each radio set on a
common net, is of significant importance. A relative
standard or master must be established to prevent
gradual time creepage during normal communications.
One radio set will be designated as master. The time
difference will be accommodated in the other radios,
not the master radio. The net control station, or master,
is designated as the time standard for all radio sets in
the net.
(2) Loading ECCM Parameters. TO use the
ECCM function, TRANSEC variables and hopsets or
lockouts are loaded into the transceiver by an external
fill device connected to the FILL connector.
(3) Signalling an ECCM Radio. in a typical
ECCM signaling operation, an operator with a non-
ECCM radio set attempting a contact within an ECCM
net places the PRESET switch to CUE. The ECCM radio
display indicates CUE for 7 seconds and the ECCM
radio operator hears a tone in his headset for 2 seconds
each time the non-ECCM radio is keyed. The non-
ECCM radio must be keyed for at least 4 seconds to insure
reception by the ECCM radio. The ECCM radio is
then switched to the single channel CUE frequency or
some other predetermined frequency to establish contact.
b. Other Operational Modes. Depending on the
settings of the operational controls, the radio set can be
used for the following modes of operation:
(1) Two way clear voice (SC).
(2) Two way secure voice with TSEC/KY-58
installed (SC).
(3) Two way frequency hopping voice (FH or FHM).
(4) Two way frequency hopping secure voice
with TSEC/KY-58 installed (FH or FH-M).
3.10.4 Operating Procedures.
a. Manually Entering Frequency. When using the
nine digits on the keyboard, entry of information is normally
displayed digit-by-digit left to right on the display.
Operation of the transceiver is altered only after
complete, valid data is registered on the display and the
Sto ENT button pressed within the 7 second time-out
period. Illegal entries will not register on the display.
Incomplete entries will not be accepted when the Sto
ENT button is pressed.
Acceptance of valid data is signaled by a momentary
blink of the display when the Sto ENT button is
pressed. At this time, the transceiver acts upon the
entry.
Partial or erroneous data can be erased at any time by
pressing the CLR button, at which time the last readout
will be cleared.
1.
2.
3.
4.
5.
6.
7.
FUNCTION switch - SQ ON or SQ OFF, as
desired.
MODE switch - SC.
PRESET switch - MAN.
FREQ button - Press.
played.
Frequency is dis-
CLR button - Press. Display shows all bottom
dashes.
Keyboard - Enter 5 digits for frequency.
Sto ENT button - Press. Display blinks momentarily.
b. Loading Preset Channels. Seven preset channels
are available (PRESET positions 1 through 6 and
CUE). These channels select discrete frequencies in
non-ECCM modes and provide an analogous function
in the (FH) ECCM mode. The function of the PRESET
switch is two-fold. In a normal single-channel mode
(MODE switch set to SC), either manual or preset frequencies
are selected. In an ECCM frequency hopping
mode (MODE switch set to FH or FH-M), nets are selected
according to predetermined preloaded data.
When a (FH) net is selected, the display will indicate
FH followed by the corresponding valid (FH) data number.
The CUE frequency can serve as a seventh preset
3-27
TM 1-1520-238-10
channel in single-channel operation or as a special
signaling frequency in the FH modes.
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