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frequency is detected, an advisory FM-1 cue day (TOD) currently in the radio along with a
or FM-2 cue will appear. This procedure will cursor. The TOD displayed may be retained
allow a station to alert a frequency hopping by pressing ENTER on the MFK. Otherwise,
net to step down to single channel to make
contact.
3. The Net Control Station (NCS) uses the
frequency hopping-master or CONTROL
mode. It differs from FH MEMBER in two
ways. The NCS is the time standard for the
net, and the NCS RT is the only one that can
transmit ERF data. The NCS RT does not
adjust its clock with a received message.
When the NCS is an active net number, all
t h e n e t m e m b e r R T c l o c k s w i l l b e
synchronized with the NCS RT clock. All the
required FH data, except the TSEC variable,
may be sent from the NCS to net members
using ERF. A typical net opening will use the
cold start procedure. Operation in the cold
s t a r t mode i s the same as normal FH
operation except that the RT hops on a single
frequency. The frequency used is the one in
the SC manual frequency (M1/M5).
3-27. (CDS3) AN/ARC-201D SINCGARS
FREQUENCY HOPPING CONTROL PAGES.
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
EMER T/R
FM-1
6 NET 323
MEMBER
406075-1415
H3414
SC FH
PWR LO
TOD 21 23:59 FH DATA
PAGE 2
MEMBER
CONTROL
Operation of the AN/ARC-201D VHF FM radio in the Figure 3-16. (CDS3) FM-1  FM-2 Radio Control
frequency hopping (FH) mode is controlled from the Page 1 (FH Mode)
3-29
TM 1-1520-248-10
enter a new TOD by entering the day, hour,
and minutes in the format DDHHMM (e.g.,
231430). Pressing ENTER on the MFK starts
the internal clock, and should be done as
accurately as possible according to unit SOP
(local or zulu time). When entered the time
will be removed from the display. TOD will be
received from the Net Control Station (NCS)
with the ERF.
NOTE
If the EGI is powered up and has acquired a
satellite, FM1 and FM2 can obtain ZULU
time by typing a TOD of 00 00:00 on the
MFK and pressing ENTER. Pressing TOD
again will cause the radio to display the
correct ZULU time.
6. MEMBER/CONTROL key (R-2)  Toggles
between MEMBER and CONTROL. I f
MEMBER is selected, the radio will be a
member of the FH net. If CONTROL is
selected, the radio will be the controller/NCS.
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
FM-1
5 NET 409
ERF RCV MEMBER
CH 5 XXX
LATE NET
COPY HSET
FILL
CLEAR
PAGE 1
406075-1416
J0546
LOAD
COMSEC
Only one controller/NCS should be operating
Figure 3-17. (CDS3) FM-1  FM-2 Radio Control per net.
Page 2 (FH Mode - Member)
7. FH DATA PAGE 2 (R-5)  Only available in
FH mode. Selects FM-1 or FM-2 Radio
Control page 2 (fig. 3-17 and 3-18), which is
used to enter initializing data for the RT in the
FH mode.
8. ERF SEND/ERF RECV (L-1)  Allows the RT
to either transmit or receive FH data based
on whether MEMBER or CONTROL i s
selected on FM-1 or FM-2 Radio Control page
1. If MEMBER is selected, ERF RECV will
appear. To receive ERF, appropriate manual
frequency must be entered in SC mode,
channel M selected, and tuned COLD. The
channel number of an already established net
may also be used. When pressed, ERF RECV
will be boxed. When the ERF is received, the
text will change to SAVE HSET. The HSET
can be saved by again pressing L-1 which
changes the text to STORE CH= and a
cursor. Enter a channel number (1 thru 6).
The legend changes to a boxed ERF RECV.
When the RT has stored the channel, the box
around ERF RECV goes a w a y . A f t e r
performing an ERF STORE the FM radio will
automatically tune to the channel the
PULL
MAN
PULL
BKUP
BRT
C
ONT VSD HSD MMS COMM
FM-1
CH 5 XXX
HSET
EDIT
COPY HSET
FILL
CLEAR
PAGE 1
406075-1417
J0546
C 89.500
ERF SEND CONTROL ZEROIZE
LOAD
COMSEC
received hopset was stored to. This allows
Figure 3-18. (CDS3) FM-1  FM-2 Radio Control the pilot to verify what hopset was received.
Page 2 (FH Mode - Control) When another channel is desired following an
3-30
TM 1-1520-248-10
ERF STORE, manually tune the radio to the digits of the channel displayed between L-3/
desired FH channel. If CONTROL is selected, L-4 can then be entered/changed, followed by
　
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