TM 11-5820-890-10-1
LOADING COMSEC KEYS (LOCAL FILL). Use the following procedure to load COM-
SEC keys. The NCS will tell you in which channel to store COMSEC keys. There are
two types of COMSEC keys, referred to as TEK’s and KEK’s. This procedure is used
to load both types. The NCS and the keyboard display make use of the terms TEK
and KEK.
a. Turn off fill device (KYK-13 or KYX-15); then connect fill cable to
RT AUD/FlLL connector.
b. Set RT switches:
FCTN to LD, COMSEC to CT.
NOTE
COMSEC ALARM
If COMSEC alarm (beeping alarm) is heard, key handset twice for
a minimum of 1/2 second each key. If a good COMSEC key is al-
ready in the radio, the alarm will clear to no alarm. If the radio
doesn’t have a good COMSEC key, the alarm will clear to a steady
tone.
A COMSEC key can only be loaded when a steady tone is present
at the handset. The steady tone will clear to no alarm if fill proce-
dure is successfully completed.
If the COMSEC alarm will not clear, set FCTN to
then
to TST. If TST results in a "FAIL 5" display, there is a COMSEC
failure. If "GOOD" is displayed, resume normal operation.
c. Set fill device controls (KYK-13, or KYX-15): Set MODE to ON; then
select COMSEC key to be loaded.
NOTE
If COMSEC keys are required and MAN channel is being used, the
COMSEC key used will default to the COMSEC key stored in channel
5. If necessary, scroll to another channel containing a COMSEC key
and check its validity (refer to step b notes) before resuming opera-
tion.
d. Load COMSEC key:
KYK-13 or KYX-15
Press RT LOAD.
Display flashes "LOAD",
then "H TEK" (or "H KEK").
Press STO; then enter
the channel number
where COMSEC key is to
be stored. Display will blink,
and two beeps will be heard.
NOTE
Same procedure applies when changing COMSEC key for during-op-
eration updates using a fill device.
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