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channel (L-3/L-4) and press R-1; LATE NET Control page 1 (fig. 3-11).
will box until the RT has received a new time
sync. LATE NET is only available when 4. L-4 Press to enter manual frequency.
helicopter is off the ground.
NOTE
13. COPY HSET (R-2) Allows one channel to
be copied to another. When pressed display A frequency must be entered into manual
will change to FROM CH=, a stored channel channel and displayed on RFD. A preset
is entered from the MFK, the cursor changes frequency from preset list cannot be used.
to TO CH=, and desired destination channel
is entered from the MFK. 5. L-1 Press to select FH.
14. FILL (R-3) Allows TSEC, HSET, and LSET 6. R-5 Press to select FM-1 or FM-2 Radio
variables to be loaded to the RT while the Control page 2 (fig. 3-12 or 3-13) .
helicopter is on the ground. To load, connect
fill device to RT, select desired variable on fill 7. Ensure fill device is off; connect device to
device, and turn fill device power on. Press radio.
3-23
TM 1-1520-248-10
8. Turn fill device on and select FILL position. 3. R-5 Press to select FM-1 or FM-2 Radio
Control page 1 (fig. 3-11).
9. R-3 Press to select FILL. When FILL
unboxes, turn power on fill device to OFF and 4. L-4 Press to enter the manual frequency.
disconnect.
5. L-1 Press to select FH.
10. L-3/L-4 Press to cycle channel and return
to channel M. Channel should display M and 6. L-5 Press to select TOD. If correct, TOD
COLD. displayed may be retained by pressing
ENTER on MFK. Otherwise, enter a new TOD
11. L-1 Press to select ERF RECV. ERF by entering DDHHMM ( e . g . , 231430).
RECV will box and RT is now ready to Pressing ENTER on the MFK starts the
receive ERF from NCS. internal clock, and should be done as
accurately as possible according to unit SOP
NOTE (local or zulu time).
ERF procedures can be done in plain text or 7. R-5 Press to select FM-1 or FM-2 Radio
cipher mode. Control page 2 (fig. 3-12 or 3-13).
12. When NCS sends the ERF, display at L-1 will 8. L-3/L-4 Channel up/down, then back to
change to SAVE ERF. tune desired net.
13. L-1 Press to SAVE ERF. Legend will NOTE
change to STORE CH= and a cursor. Enter
channel (1 6) to store ERF. If TOD has not drifted more than plus or
minus 4 seconds, automatic re-entry into net
should occur.
14. L-3/L-4 Press to select channel just stored.
The display will show TUNING, and when
tuned, a three-digit net designation (e.g., 350) 9. R-1 Press to select LATE NET. The legend
will display. The RFD (fig. 3-1) will also LATE NET will replace ZEROIZE at R-1 once
display net designation. the aircraft is off the ground. The legend
LATE NET will remain boxed until the radio
has synchronized into the net.
15. Complete communication check with NCS.
NOTE
3-21. AN/ARC-201 SINCGARS LATE NET
ENTRY. LATE NET commands the RT to permit a plus or minus 59 second difference.
Late net entry allows members to join a net that is
already operating. The type of entry is based entirely 10. Contact NCS to report into the net.
on data that is currently stored in the RT. If you were
temporarily out of a net, for example, shutdown for b. Cue and ERF Procedure.
refueling, the passive net entry will allow entry with no
workload on the NCS. To enter an alternate net 1. COMM key (or DSPL SEL switch) Press.
requires that the RT only be loaded with the correct COMM page (fig. 3-7) displays.
TRANSEC variable. This Cue and ERF method does
require coordination with the NCS. 2. L-1/L-5 Press to select FM-1 or FM-2 and
frequency list (fig. 3-8).
a. Passive Net Entry.
3. R-1 Press to add cue frequency. Enter C
1. COMM key (or DSPL SEL switch) Press. using MFK followed by frequency and
COMM page (fig. 3-7) displays. identifier (if desired).
2. L-1/L-5 Press to select FM-1 or FM-2 and 4. CHAN switch (on pilot collective or CPG
frequency list (fig. 3-8). instrument panel) Press up or down until C
3-24
TM 1-1520-248-10
is displayed in channel block of RFD (fig. 3- NOTE
1).
The frequency list has 18 preset channels
5. RFD Check radio is set to plain text (non- including a manual channel assigned to
secure). each radio. The ARC-201s have an
additional CUE channel. The HF has one
6. Transmit on cue frequency f o r 4 to 5 manual and nine preset channels.
seconds.
4. ADD Key Press. Cursor will display at
7. CIPH switch (RFD) Press at once to return bottom of radio list.
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(50)
