HEADQUARTERS OH-58A, Technical Manual, Page: 160 / 292

TM 55-1520-228-10
3-34 Change 10
SECTION IV. AN/ARC-201 SINCGARS RADIO SET
3-71. VHF/FM RADIO SET AN/ARC-201.
3-72. DESCRIPTION – VHF/FM RADIO
SET.
The AN/ARC-201 VHF FM facility, consisting of a 2300
channel (approximately) radio set, an improved FM filter
amplifier (IFM), FM communication antenna, and FM
homing antenna, is used for point-to-point FM voice
communication and station homing. The facility oper-
ates in the very high frequency range of 30.000 to
87.975 MHz in 0.025 MHz steps. The VHF FM radio set
contains a multichannel, electronically tunable main re-
ceiver and transmitter, and Electronic Counter Counter-
measures (ECCM). Retransmission of voice CW or
X-mode communications is possible when a second set
(AN/ARC-201) is installed. The radio sets are marked
VHF FM COMM and are installed in the instrument pan-
el center. Antenna locations are shown in figure 3-1.
3-73. CONTROLS AND FUNCTION – FM
RADIO SET AN/ARC-201 & ZEROIZE
SWITCH.
Refer to figure 3-18.
3-74. OPERATING PROCEDURES – FM
RADIO SET AN/ARC-201 & ZEROIZE
SWITCH.
a. Transmit/Receive.
(1) FUNCTION selector switch – SQ ON.
(2) MODE selector switch – SC.
(3) PRESET selector switch – MAN.
(4) IFM RF PWR selector switch – Set as re-
quired.
(5) Frequency – Select frequency using key
pad as follows:
(a) FREQ key – Press.
(b) CLR key – Press.
(c) Key in desired frequency.
(d) STO/ENT key – Press.
(6) VOL – Adjust.
(7) Transmit. Transmit-Interphone selector
position No. 1 (No. 5 for FM#2).
b. Frequency Hopping.
NOTE
To operate radio set frequency hopping
mode, perform the following steps be-
fore PRESET selection:
(1) FUNCTION selector switch – LD-V.
(2) MODE selector switch – FH.
(3) PRESET channel select switch – MAN. Dis-
play reads FILL T.
(4) Connect an ECCM fill device to radio set
FILL connector.
(a) ECCM device power switch – ON.
(b) Selector switch – T1.
(5) On radio set, H-LD/O key – Press. Display
reads STO T, then COLD.
(6) On ECCM device, switch T1 to 1.
(7) FUNCTION selector switch – LD.
(8) H-LD/O – Press. Display reads hopset num-
ber.
(9) STO/ENT – Press.
(10) Key pad 1 – Press. Stores HOPSET data
in PRESET 1.
(11) Repeat steps 4 through 10 for remaining
PRESET numbers 2 through 6.
NOTE
To operate Time of Day (TOD), both ra-
dios must be within 1 minute of each
other in order to establish communica-
tions in steps 11 through 17.
(12) TIME key – Press once.