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be in RMT before remote selection of RFD p o s i t i o n d e s i r e d . Arrow p o i n t i n g t o
displays. crewmember tuning selected radio will move
to desired radio line on RFD (fig. 3-1).
1. Radio  Select radio desired by pressing
radio select switch on pilot collective control 2. CHAN switch (on pilot collective or CPG
head (fig. 3-3) or rotating transmit selector instrument panel)  Press up or down until
switch on the CSC panel (fig. 3-2) to desired M1 is displayed in channel block of RFD. M1
3-39
TM 1-1520-248-10
(last manual frequency entered) will be 3-36. COMSEC UNIT (KY-58) LOADING
displayed for radio desired. PROCEDURE (UHF AND VHF RADIOS).
3. CHAN switch  Press to KYBD position. NOTE
4. Frequency number  Enter using MFK. Ground power unit (GPU) should be
connected for loading Crypto-Net Variables
NOTE (CNV) into COMSEC units, or battery
v o l t a g e may become t o o l o w f o r a
Entering a manual channel frequency can successful engine start.
be accomplished from the radio CONTROL
PAGE by selecting the keyboard key and 1. GPU  Connected.
entering the desired frequency.
2. COMM key  Press.
5. ENTER key  Press. Frequency selected will
be manually tuned into radio and replaces
p r e v i o u s manual f r e q u e n c y . Manual 3. COMSEC key  Press.
frequency entered is now set for transmitting.
4. Select radio 2 (UHF) or radio 3 (VHF) using
the transmit select switch on the CSC panel
3-35. COMSEC MODE FOR FM-1, FM-2, UHF, (fig. 3-2).
AND VHF RADIOS.
5. RFD (fig. 3-1)  Press CIPH button. Check
NOTE CIPHER flag displays by UHF or VHF radio
selected on RFD.
KY #1 is dedicated to the UHF radio. KY #2
is dedicated to the VHF radio. FM-1 and 6. COMSEC u n i t  S e l e c t a p p r o p r i a t e
FM-2 have built-in COMSEC functions. COMSEC unit (No. 1 or No. 2) loading in the
avionics compartment. Forward COMSEC unit
1. COMM key (or DSPL SEL switch)  Press. is COMSEC unit No. 2 (VHF).
COMM page (fig. 3-7) will display.
7. OVERRIDE/NORMAL switch  OVERRIDE.
2. COMSEC key  Press. COMSEC page (fig.
3-22) will display. 8. COMSEC PWR switch  ON.
NOTE 9. VOLUME knob  Full clockwise.
• For KY-58 operations, use VHF or UHF 10. COMSEC unit FILL select switch  Z ALL,
keys R-1  R-4. then Z1  5.
• For ARC-201D operations use L-1  L-4.
11. COMSEC unit MODE selector switch  LD.
3. FILL SEL key  Press until desired fill
number displays in box. Fill number will 12. KYK-13  Install on appropriate COMSEC
sequence from numbers 1 through 6 as key is unit.
pressed.
13. KYK-13 PWR switch  ON.
NOTE
14. COMSEC unit FILL select switch  Set to
Time delay function must be enabled for FM desired position to be filled.
retransmission in the secure mode.
15. ICS/RADIO switch  Press to full detent.
4. T/DELAY key  Press if required. Display Check for a single beep in headset and red
alternates between OFF and ON to indicate indicator light should flash on the KYK-13
when time delay function is enabled. indicating CNV is loaded.
3-40
TM 1-1520-248-10
1. COMM key (or DSPL SEL switch)  Press.
COMM page (fig. 3-7) will display.
2. FM-1 key  Press to select FM-1 and
frequency list (fig. 3-8).
3. R-5  Press to display FM-1 Radio Control
page 1 (fig. 3-16).
4. Desired frequency for FM-1  Enter using
procedures in paragraph 3-32.
5. Repeat steps 1 through 4 for FM-2.
6. COMM key  Press. COMM page (fig. 3-7)
will display.
7. RETRAN key  Press. RETRAN page will
display.
8. FM-1 key  Press. Box will appear around
FM-1.
9. FM-2 key  Press. Box will appear around
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
FM-1
FILL SEL 1
PLAIN
COMSEC
T/DELAY OFF
T/DELAY OFF
FM-2
FILL SEL 2
PLAIN
FILL SEL 1
UHF
1 FILL SEL
OFF T/DELAY
VHF
2 FILL SEL
OFF T/DELAY
ON SIGNAL
406075-1414-2
J2992
(CDS3)
ONLY
Figure 3-22. COMSEC Page FM-2.
16. Steps 12 through 15  Repeat until all 10. CIPH switch on RFD  Press (as required)
desired CNVs are loaded. for desired cipher mode. Both FM radios will
operate in cipher mode when the cipher mode
17. KYK-13 PWR switch  OFF. is selected.
18. Remove KYK-13 from COMSEC unit. 3-38. (CDS4) SETTING FM-1 AND FM-2 FOR
　
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