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Operation of the AN/ARC-201 VHF FM radio in the
frequency-hopping  member (FH) or frequencyhopping
 master mode is controlled from the FM-1 
FM-2 Radio Control page (fig. 3-19). The area at the
top center of the page displays radio status information
on five lines. The first line indicates which radio, FM-1
or FM-2, is selected. The second line indicates radio
RETRAN status. The line is blank if RETRAN status is
OFF. RETRAN will be displayed if RETRAN status is
ON. The third line displays current channel number and
HSET. The data is in the form C NET HHHHHHH
(C=channel number - 1-6 or M and HHHHHHH=current
HSET - 000-999, COLD, or NO TSEC). The fourth line
displays the channel identifier. The fifth line consists of
the text BUSY if the radio is busy or displays one of the
following special data displays:
BLANK (No Text) L8
CUE FILL CMPLT
BIT GO FILLING
CLR GO ERROR
STO GO NO TOD
SEND GO NO FILL
LATE NET BAD FILL
LSET MEM NO KEYS
HSET MEM NO KEY
L7/L8 REC ERR
L7 SEVERE
The FH frequency list is displayed (boxed) in the
center of the page.
1. COMM key (or DSPL SEL switch)  Press.
COMM page (fig. 3-7) displays.
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
EMER T/R
FM-1
RETRAN
M NET COLD
045.000
BUSY
SC FH FH-M
PWR NORM
TOD PAGE 2
DATA MODE
SDM
(TAC, FS)
DATA RATE
1200
(TAC, TYPICAL)
HOPSET
M COLD 045.000
1 345 110CAV
2 NO HSET
3 450 1SINF
4 NO HSET
5 650
6 895 3ACR
C 035.975 OPS
406075-1415
J2992
Figure 3-19. (CDS4) FM-1  FM-2 Radio Control
Page 1 (FH Mode)
3-32
TM 1-1520-248-10
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. R-2  Not used for CDS4 (operating mode,
member or master, is selected at L-1).
7. DATA MODE Key (R-3)  Pressing R-3
toggles the DATA MODE between the SDM
and EDM modes. When in the SDM mode,
the legend consists of the text DATA MODE
on line 1, SDM (boxed) on line 2, and the text
TAC, FS on line 3. In the EDM mode, the
legend consists of the text DATA MODE on
line 1, EDM (boxed) on line 2, and the text TI
on line 3.
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
FM-1
ERF RCV
FILL
CLEAR
PAGE 1
LOAD
HSET
CH M
RETRAN
M NET COLD
045.000
BUSY
ZEROIZE
HOPSET LATE NET
M COLD 045.000
1 345 110CAV
2 NO HSET
3 450 15INF
4 NO HSET
5 650
6 895 3ACR
C 035.975 OPS
406075-1416
J2992
Figure 3-20. (CDS4) FM-1  FM-2 Radio Control
8. DATA RATE Key (R-4)  Pressing R-4 Page 2
cycles through the various data rates
available for the mode selected using R-3. will be boxed. When the ERF is received, the
When R-3 is in the SDM mode, the legend text will change to SAVE HSET. The HSET
consists of the following: 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).
DATA RATE (line 1)
XXXX (line 2) XXXX = 600, 1200, 4800, The legend changes to a boxed ERF RECV.
16K, AD1, or AD2 When the RT has stored the channel, the box
YYYYYYYYYYY (line 3) YYYYYYYYYYY = 1200, around ERF RECV goes a w a y . A f t e r
2400, 4800, 9600, or PCKT performing an ERF STORE the FM radio will
automatically tune to the channel the
received hopset was stored to. This allows
9. FH DATA PAGE 2 (R-5)  Only available in the pilot to verify which hopset was received.
FH mode. Selects FM-1 or FM-2 Radio When another channel is desired following an
Control page 2 (fig. 3-20), which is used to ERF STORE, manually tune the radio to the
enter initializing data for the RT in the FH desired FH channel. If CONTROL or FH-M is
mode. selected, the ERF SEND legend is replaced
by RETRIEVE CH= and a cursor. To send
10. ERF SEND/ERF RECV (L-1)  Allows the RT ERF, appropriate manual frequency must be
to either transmit or receive FH data based entered in SC, channel M selected, and tuned
on whether MEMBER, CONTROL, or FH-M is
COLD. The channel number of an already
selected on FM-1 or FM-2 Radio Control page
　
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