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(TSEC variable, hopset and lockout sets). synchronizing signal at a maximum of once
every 30 seconds for the net. The RT also
NOTE checks the cue frequency during passive
receive for any activity. When an RF signal
Fill batteries for the AN/ARC-201 are with a 150 Hz squelch tone on the RF cue
located on top of the unit requiring removal frequency is detected, an advisory FM-1 cue
to replace. The batteries (BA 5372) are the or FM-2 cue will appear. This procedure will
same as the KY-58 fill batteries. Problems allow a station to alert a frequency hopping
can arise tuning stored HSET/LSET net to step down to single channel to make
frequencies (indicated by the text XXX NO contact.
HSET or XXX ERR) when weak batteries
are installed. 3. The Net Control Station (NCS) uses the
frequency hopping-master or CONTROL
mode. It differs from FH MEMBER in two
3-20
TM 1-1520-248-10
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).
3-19. AN/ARC-201 SINCGARS FREQUENCY
HOPPING CONTROL PAGES.
Operation of the AN/ARC-201 VHF FM radio in the
frequency hopping (FH) mode is controlled from the
FM-1  FM-2 Radio Control page (fig. 3-11). The area
at the top center of the page displays radio status
information on four lines. The first line indicates which
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
radio, FM-1 or FM-2, is selected. The second line Figure 3-11. FM-1  FM-2 Radio Control Page 1
indicates whether the radio is in the RETRANS mode or (FH Mode)
is blank. The third line displays channel number, the
legend NET, and the three-digit net identification. The will be removed from the display. TOD will be
fourth line will indicate CONTROL or MEMBER as received from the Net Control Station (NCS)
selected on FM-1 Radio Control page 1. NO TSEC will with the ERF.
display on this line if no TSEC variable has been
loaded and stored. NOTE
1. COMM key (or DSPL SEL switch)  Press. (CDS3/CDS4) If the EGI is powered up and
COMM page (fig. 3-7) displays. has acquired a satellite, FM-1 and FM-2 can
obtain ZULU time by typing a TOD of 00
2. L-1/L-5  Press to select FM-1 or FM-2 and 00:00 on the MFK and pressing ENTER.
frequency list (fig. 3-8). Pressing TOD again will cause the radio to
display the correct ZULU time.
3. R-5  Press to select FM-1 or FM-2 Radio
Control page 1 (fig. 3-11). 6. MEMBER/CONTROL key (R-2)  Toggles
between MEMBER and CONTROL. I f
4. SC/FH key  Press to select frequency MEMBER is selected, the radio will be a
hopping (FH). member of the FH net. If CONTROL is
selected, the radio will be the controller/NCS.
5. TOD key (L-5)  Press to display the time of Only one controller/NCS should be operating
day (TOD) currently in the radio along with a per net.
cursor. The TOD displayed may be retained
by pressing ENTER on the MFK. Otherwise, 7. FH DATA PAGE 2 (R-5)  Only available in
enter a new TOD by entering the day, hour, FH mode. Selects FM-1 or FM-2 Radio
and minutes in the format DDHHMM (e.g., Control page 2 (fig. 3-12 and 3-13), which is
231430). Pressing ENTER on the MFK starts used to enter initializing data for the RT in the
the internal clock, and should be done as FH mode.
accurately as possible according to unit SOP
(local or zulu time). When entered the time
3-21
TM 1-1520-248-10
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. When
pressed, ERF RECV will be boxed. When the
ERF is received, the text will change to SAVE
　
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