(8) Memory battery. BA-1372, mercury battery supplies voltage to the memory of the KYK-
13, to maintain memory when the KYK-13 is turned off. Life expectancy is 180 days. (6 months.)
Prepare and Operate TSEC/KY-57. Now that we have looked at the communications security
equipment lets see how it is operated.
a. Install the battery. Stand the KY-57 on the front panel protective handles. Place the BA-
5590 in place on the back of the KY-57 being careful to properly align the connectors. Place the battery
box over the battery and secure it to the KY-57 using the clamps.
b. Install the handset on the audio connector of the KY-57. When used with SINCGARS the
handset will be installed on the audio connector on the RT or mounting adapter.
CAUTION: Ensure the KYK-13 is turned OFF prior to making connections.
c. Connect the KYK-13 to the KY-57. Using the fill cable interconnect the KYK-13 and the
KY-57 from J1 on the KYK-13 to the FILL connector on the KY-57.
d. Turn on the KY-57 and clear the alarm. When the KY-57 is turned on you will hear a
rushing noise and continuous beeping in the handset. The alarm system is being tested. To clear this
alarm press and release the Push-To-Talk (PTT) switch.
e. Load a TEK. Transfer a TEK from the KYK-13 to the KY-57.
(1) Set the FILL switch on the KY-57 to the position the TEK is to be loaded in.
(2) Set the MODE switch on the KY-57 to LD.
(3) Set the FILL switch on the KYK-13 to the position containing the TEK to be loaded.
(4) Set the MODE switch on the KYK-13 to ON.
(5) Press and release the PTT on the handset. You will hear a beep on press and one on
release. If the initiate button is pressed while the KYK-13 is on, the KYK-13 will lock up. To unlock it
turn it off and back on.
f. Place the MODE switch on the KY-57 to C and check for the presence of a TEK. Key the
handset, you will hear one beep if there is a TEK loaded. If there is no key present, you will hear a