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COMMUNICATION PROCEDURES. cipher mode.
To load TSEC and HSET/LSET variables and initiate 13. When NCS sends the ERF, display at L-1 will
communication checks, proceed with the following: change to SAVE ERF.
NOTE 14. L-1  Press to SAVE ERF. Legend will
change to STORE CH= and a cursor. Enter
Radio must be in cipher mode to load channel (1  6) to store ERF.
HSET, TSEC, and COMSEC variables.
15. L-3/L-4  Press to select channel just stored.
1. COMM key (or DSPL SEL switch)  Press. The display will show TUNING, and when
COMM page (fig. 3-7) displays. tuned, a three-digit net designation (e.g., 350)
will display. The RFD (fig. 3-1) will also
2. L-1/L-5  Press to select FM-1 or FM-2 and display net designation.
display frequency list (fig. 3-8).
16. Complete communication check with NCS.
3. R-5  Press to select FM-1 or FM-2 Radio
Control page 1 ((CDS3) fig. 3-16 or (CDS4) 3-30. AN/ARC-201D SINCGARS LATE NET
fig. 3-19). ENTRY.
4. L-4  Press to enter manual frequency. Late net entry allows members to join a net that is
already operating. The type of entry is based entirely
NOTE on data that is currently stored in the RT. If you were
temporarily out of a net, for example, shutdown for
A frequency must be entered into manual refueling, the passive net entry will allow entry with no
channel and displayed on RFD. A preset workload on the NCS. To enter an alternate net
frequency from preset list cannot be used. requires that the RT only be loaded with the correct
TRANSEC variable. This Cue and ERF method does
5. L-1  Press to select FH. require coordination with the NCS.
a. Passive Net Entry.
6. R-5  Press to select FM-1 or FM-2 Radio
Control page 2 ((CDS3) fig. 3-17 or 3-18 or 1. COMM key (or DSPL SEL switch)  Press.
(CDS4) fig. 3-20). COMM page (fig. 3-7) displays.
7. L-2  Press to select HSET. 2. L-1/L-5  Press to select FM-1 or FM-2 and
display frequency list (fig. 3-8).
8. Ensure fill device is off and connect to radio.
3. R-5  Press to select FM-1 or FM-2 Radio
9. Turn fill device on and select FILL position Control page 1 ((CDS3) fig. 3-16 or (CDS4)
using L-3 or L-4. fig. 3-19).
3-35
TM 1-1520-248-10
4. L-4  Press to enter the manual frequency. 3. R-1  Press to add cue frequency. Enter C
using MFK followed by frequency and
5. L-1  Press to select FH. identifier (if desired).
6. L-5  Press to select TOD. If correct, TOD 4. CHAN switch (on pilot collective or CPG
displayed may be retained by pressing instrument panel)  Press up or down until C
ENTER on MFK. Otherwise, enter a new TOD is displayed in channel block of RFD (fig. 3-
by entering DDHHMM ( e . g . , 231430). 1).
Pressing ENTER on the MFK starts the
internal clock, and should be done as 5. RFD  Check radio is set to plain text (nonaccurately
as possible according to unit SOP secure).
(local or zulu time).
6. Transmit on cue frequency f o r 4 to 5
7. R-5  Press to select FM-1 or FM-2 Radio seconds.
Control page 2 ((CDS3) fig. 3-17 or 3-18 or
(CDS4) fig. 3-20). 7. CIPH switch (RFD)  Press at once to return
to cipher text if this is a secure net and await
response.
8. L-3/L-4  Channel up/down, then back to
tune desired net.
8. Repeat cue procedure after 15 seconds until
cue call is answered.
NOTE
NOTE
If TOD has not drifted more than plus or
minus 4 seconds, automatic re-entry into net Cue calls go through only when the net is
should occur. quiet. Because you do not know when the
net is quiet, the solution is to repeat your
9. R-1  Press to select LATE NET. The legend cue call until you get an answer.
LATE NET will replace ZEROIZE at R-1 once
the aircraft is off the ground. The legend 9. When cue call is answered, follow NCS
LATE NET will remain boxed until the radio instructions for NET entry and receiving and
has synchronized into the net. ERF.
10. (CDS4) R-2  Press to select LATE NET. 10. Once the ERF is stored, you are ready to
Pressing R-2 boxes LATE NET legend and enter net.
places radio in late net entry mode. While
LATE NET is boxed, transmissions by other
members of the net allow the radio time to 3-31. ENTERING A FREQUENCY INTO
synchronize. Pressing R-2 again turns off late MEMORY OR CHANGING A STORED
net and removes box from legend. FREQUENCY SELECT FM-1, FM-2, VHF, OR
UHF.
NOTE
NOTE
LATE NET commands the RT to permit a
plus or minus 59 second difference. The transmit select switch on the CSC must
be in RMT before remote selection of RFD
　
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