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to MAN position.
(3) Push the ↑ (up arrow) or → (right arrow)
button until KEY OPS is displayed.
(4) Push the INIT button. LOAD KEY will be
displayed.
(5) Push the ↑ (up arrow) or → (right arrow)
button until ZERO is displayed.
TM 1-1520-240-10
3-2-26
(6) Push the INIT button. ZERO N with a flashing
N will be displayed. The flashing N indicates the currently
selected key location to be zeroized.
(7) Press the ↑ (up arrow) or → (right arrow)
button until the required location (1, 2, 3, 4, 5, 6, U) is
displayed.
(8) Press the INIT button. The entire ZERO N
message will now be flashing.
(9) Press the INIT button. The display will go
blank while the key zeroize process is being performed.
Upon completion of a successful key zeroizing, a pass
tone will be heard and display will briefly indicate
ZEROED N, where N is the key location.
(10) To zeroize additional keys, wait until the display
indicates ZERO N (with N flashing), then repeat
steps 7 through 9.
(11) Rotate MODE switch out of OFFLINE to exit
Key Load.
3-2-31. Online Mode Selection Menu.
This procedure is used to modify the Online MODE configuration.
a. Place the KY-100 MODE switch to the CT position.
b. Rotate the KY-100 PRESET switch to the MAN
position. If the PRESET switch is in position 1, 2, 3, 4, 5,
or 6, the MODE selections cannot be modified. Refer to
the section on changing PRESET settings to modify the
PRESET configuration.
c. Press the INIT button. The WB (Wide Band) or NB
(Narrow Band) (which ever mode is active) enunciator
will begin flashing.
NOTE
The KY-100 will be operated in Narrow Band
mode only with the ARC-220 Radio Set.
d. Press the ↑ (up arrow) button until the desired
enunciator (WB or NB) is flashing.
e. Press the → (right arrow) button. The Mode field
will be flashing.
f. Press the ↑ (up arrow) button until the desired
MODE setting (CT or PT) is flashing.
g. Press the→ (right arrow) button. The Modem field
will be flashing.
h. Press the ↑ (up arrow) button until the desired
Modem setting (HF, LOS, or bd) is flashing.
i. Press the→ (right arrow) button. The Key field will
be flashing.
j. Press the ↑ (up arrow) button until the desired Key
location (1, 2, 3, 4, 5, or 6) is flashing.
k. Press the→ (right arrow) button. The Data Rate
field will be flashing.
l. Press the ↑ (up arrow) button until the desired Data
Rate (300, 600, 1.2K, or 2.4K) is flashing.
m. After all fields have been set properly: Press the
INIT button to save the settings and return to Standard
Operations.
3-2-32. Cipher/Plain Text Level Modification.
The following procedures are used to modify the Receive
Cipher Text Level, Receive Plain Text Level, and CT/PT
or Cipher Text Only menus.
a. Place the KY-100 MODE switch to the CT position.
b. Rotate the KY-100 PRESET switch to the CT position.
c. To modify the Receive Ciphertext Volume, go to
step d, to modify the CT/PT or Ciphertext Only setting, go
to step i, and to modify the Receive Plaintext Volume go
to step n.
d. Push the ↑ (up arrow) or → (right arrow) button
until RXCTV N (where N represents the current receive
level) is displayed.
e. Push INIT button. The N in RXCTV N will begin to
flash.
f. Push the ↑ (up arrow) or → (right arrow) button until
the desired receive level is displayed.
g. Push the INIT button. The N in RXCTV N will stop
flashing.
h. Push the ↑ (up arrow) or → (right arrow) button
until the Operating Mode is displayed. This completes
the Receive Ciphertext Volume adjustment.
i. Push the ↑ (up arrow) or → (right arrow) button until
CT or CT ONLY is displayed.
j. Push the INIT button. The CT or CT ONLY will begin
to flash.
k. Push the ↑ (up arrow) or → (right arrow) button
until CT (Ciphertext and Plaintext operation) or CT ONLY
(Ciphertext only operation) is displayed.
l. Push INIT button. The CT or CT ONLY will stop
flashing.
m. Push the ↑ (up arrow) or → (right arrow) button
until the Operating Mode is displayed. This completes
the CT/PT or CT Only setting.
n. Push the ↑ (up arrow) or → (right arrow) button
until RXPTV N (where N represents the current receive
level) is displayed.
o. Push INIT button. The N in RXPTV will begin to
flash.
TM 1-1520-240-10
3-2-27
p. Push the ↑ (up arrow) or → (right arrow) button
until the desired receive level is displayed.
　
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