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to cipher text if this is a secure net and await
response. 5. Channel number Enter using MFK.
Channel number will display.
8. Repeat cue procedure after 15 seconds until
cue call is answered. NOTE
NOTE Channel number selected may be an
unused channel or any channel currently
Cue calls go through only when the net is assigned to any radio, except a channel
quiet. Because you do not know when the currently in use. That channel and its
net is quiet, the solution is to repeat your assigned frequency will drop from the list of
cue call until you get an answer. assigned frequencies of that radio.
9. When cue call is answered, follow NCS 6. ENTER key Press using MFK. Cursor will
instructions for NET entry and receiving and display to the right of channel number.
ERF.
10. Once the ERF is stored, you are ready to 7. Frequency desired Enter on MFK, pressing
enter net. first two digits, decimal point, and last three
digits. Frequency will display.
3-22. ENTERING A FREQUENCY INTO NOTE
MEMORY OR CHANGING A STORED
FREQUENCY SELECT FM-1, FM-2, VHF, OR It is not necessary to enter a zero (0) before
UHF. the first two digits. Also, system will assume zeros for digits after decimal point if nothing
is entered.
NOTE
The RMT/ICS switch on pilot collective head 8. ENTER key Press. Cursor will move to the
must be in RMT before remote selection of right one space.
RFD displays.
NOTE
1. COMM key (or DSPL SEL switch) Press.
COMM page (fig. 3-7) will display. If no identifier is to be entered, press
ENTER key.
2. Radio Select by pressing radio select
switch on pilot collective control head (fig. 3- 9. Identifier (if desired) Enter up to four
3) or rotating transmit selector knob on CSC alphanumeric characters using MFK. Identifier
panel (fig. 3-2) to desired radio position. will display to the right of frequency.
Arrow on COMM page w i l l move t o
appropriate radio line. This also sets up 10. ENTER key Press. Channel number,
selected radio to accept new data. frequency and identifier will move into
numeric sequence in radio selected and
3. L-1 Press. The frequency list will be cursor will display in blank space at bottom of
displayed in the center of the MFD (fig. 3-8). selected radio list.
3-25
TM 1-1520-248-10
11. To enter additional frequencies into any radio 5. EMER T/R key Toggles between current
memory, repeat steps 4 through 10. frequency and emergency frequency 40.50
MHz.
3-23. AN/ARC-201D SINCGARS VHF-FM 6. PWR key Press to select IFM power level:
RADIO. NORM, LO, MED, HI.
The AN/ARC-201D Single Channel Ground and NOTE
Airborne Radio System (SINCGARS) provides single
channel, frequency hopping, and secure operation in The IFM HI power setting cannot be
the VHF/FM band 30.000 to 87.975 MHz in 0.025 MHz selected until enabled from the Ground Setintervals.
The AN/ARC-201D is a remote controlled Up page.
receiver-transmitter (RT) used in MIL-STD-1553B data
bus aircraft. The RT is controlled by the aircraft control 7. KYBD key Press to activate MFK for
and display system (CDS). Provisions for two radios entering radio channels from frequency list or
(FM-1 and FM-2) are provided in the aft electrical manual frequencies.
compartment. The single channel mode provides
normal VHF/FM operation for voice, digital and secure
8. TOD key No function in SC.
communication. FH mode is used to counter enemy
jamming. The SINCGARS radios are powered by the 28
Vdc essential bus and circuit protection is provided by 9. SQL key Toggles squelch between on and
the FM-1 and FM-2 circuit breakers. off.
10. OSET key Used to select a frequency
3-24. (CDS3) AN/ARC-201D SINCGARS offset for current preset or manual frequency.
SINGLE CHANNEL OPERATION. OSET may be required when dissimilar radio
sets are being used and local interference is
Operation of the AN/ARC-201D VHF FM radio is encountered. OSET is not normally used and
controlled from the FM-1 FM-2 Radio Control page should be set to 0. Options available are 0,
(Fig. 3-14). The area at the top of the control page
displays radio status information on four lines. The first
line provides the title of the page FM-1 or FM-2. The
second line indicates whether the radio is in RETRANS
or blank. The third line displays the channel number
and associated frequency. The fourth line displays the
six character identifier for that channel.
NOTE
After power is applied to the SINCGARS
AN/ARC-201D radio, line address keys are
unusable for approximately 1 minute while
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(51)
