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the ERF SEND legend i s replaced by pressing ENTER on the MFK. Valid entries
RETRIEVE CH= and a cursor. To send ERF, are 000 999. Once accepted the new
appropriate manual frequency must be identifier will be displayed next to the channel
entered in SC, channel M selected, and tuned number at L-3/L-4.
COLD. The channel number of an already
established net may also be used. Select a NOTE
channel number (1 thru 6) to retrieve an
HSET channel for sending. When entered,
the legend changes to SENDING. SENDING While LATE NET is boxed, transmission by
will remain on screen until complete or until other members of the net causes the radio’s
12 seconds have elapsed, whichever occurs time to synchronize.
first. If the ERF transmission is unsuccessful,
ERR will appear. 12. ZEROIZE/LATE NET (R-1) ZEROIZE
clears all data stored in the RT, including all
NOTE preset SC frequencies and FH data. When
pressed ZEROIZE will flash; press R-1 again
When helicopter is on the ground the legend to ZEROIZE. ZEROIZE is only available when
for L-2 is LOAD COMSEC or LOAD MODE the helicopter is on the ground. LATE NET
23. allows the RT containing all fill data, but
whose clock is out of sync, to join a net. To
activate LATE NET, select appropriate FH
9. LOAD (L-2) Toggles among COMSEC, channel (L-3/L-4) and press R-1; LATE NET
HSET, LSET, and MODE 23. will box until the RT has received a new time
sync. LATE NET is only available when
NOTE helicopter is off the ground.
• L-2 must be selected to determine 13. COPY HSET (R-2) Allows one channel to
whether the radio will be expecting an be copied to another. When pressed display
HSET, TSEC, or COMSEC fill. will change to FROM CH=, a stored channel
is entered from the MFK, the cursor changes • If hopsets are copied to a channel not to TO CH=, and desired destination channel
currently being displayed, accessing that is entered from the MFK.
channel will cause the proper indication to
appear. 14. FILL (R-3) Allows TSEC, HSET, COMSEC,
and LSET variables to be loaded to the RT
10. CH key (L-3/L-4) Increases/decreases the while the helicopter is on the ground. To load,
displayed channel number (manual and 1 thru connect fill device to RT, select desired
6) and displays the associated channel code/ variable on fill device, and turn fill device
net identification. power on. Press R-3, which will box FILL, and
allow the RT to interrogate fill device. The
NOTE TSEC variable is loaded by selecting manual
(M) channel at L-3/L-4 and pressing FILL.
This channel number is not to be confused Once TSEC variable is loaded, legend COLD
with the operational frequency channel of will appear adjacent to channel indicator
the radio. This channel is for storage of the when M channel is selected. If an HSET is
frequency hopping parameters only. interrogated, then that HSET will be stored
with displayed HSET channel number. If an
11. HSET EDIT (L-5) Only available when LSET is interrogated, then LSET channel
CONTROL is selected on FM-1 or FM-2 number associated with LSET will be stored
Radio Control page 1 and HSET is selected and displayed. If a COMSEC is loaded, the
on FM-1 or FM-2 Radio Control page 2. This variable will be stored in the radio on the
allows the controller to change an existing selected channel. After completion, turn fill
channel code or create a new channel code. device power off and remove from RT. FH will
When pressed a cursor will appear. All three not function if fill device is left attached to RT.
3-31
TM 1-1520-248-10
2. L-1/L-5 Press to select FM-1 or FM-2 and
15. CLEAR (R-4) Clears individual channels. frequency list (fig. 3-8).
When pressed, display changes to CH=;
select channel to be cleared and enter on 3. R-5 Press to select FM-1 or FM-2 Radio
MFK. Control page 1 (fig. 3-19).
NOTE 4. SC/FH/FM-M k e y P r e s s t o s e l e c t
frequency hopping (FH).
ERR will appear adjacent to R-4 if current
HSET channel is entered. 5. TOD key (L-5) Press to display the time of
day (TOD) currently in the radio along with a
cursor. The TOD displayed may be retained
3-28. (CDS4) AN/ARC-201D SINCGARS by pressing ENTER on the MFK. Otherwise,
FREQUENCY HOPPING CONTROL PAGES. enter a new TOD by entering the day, hour,
and minutes in the format DDHHMM (e.g.,
NOTE 231430). Pressing ENTER on the MFK starts
the internal clock, and should be done as
Control mode is called FH-M (frequency- accurately as possible according to unit SOP
hopping master). (local or zulu time). When entered, the time
will be removed from the display. TOD will be
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(55)
