TM  1-1520-240-10 3-2-26            (6) Push the INIT button. ZERO N with a flash- ing N will be displayed. The flashing N indicates the cur- rently 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 dis- play  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 con- figuration. a.  Place the KY-100 MODE switch to the CT posi- tion. 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 posi- tion. b.  Rotate the KY-100 PRESET switch to the CT posi- tion. 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.