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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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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(61)
