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hopping mode (FH) of operation. The radio set
provides communications of secure or plain voice over
the frequency range of 30 to 87.975 Mz at 25 kHz intervals.
A frequency offset tuning capability of -10 kHz, -5
kHz, +5 kHz and +10 kHz is provided for transmitting
and receiving in the non-ECCM mode only. When used
with the TSEC/KY-58 voice security system, the radio
set is capable of transmitting and receiving clear voice
or cipher mode communications. In the installed configuration
there is no retransmission or homing capability.
A memory holding battery is used to retain stored
3-24
FH parameters, time and preset frequencies when primary
power is removed from the transceiver. The radio
set receives 28 vdc from the emergency dc bus through
the VHF FM circuit breaker on the pilot overhead circuit
breaker panel.
3.10.1 Antennas. The antennas used are the same as
the AN/ARC-186 antennas.
3.10.2 Controls and Functions. Controls for the AN/
ARC-201 are on the front panel of the unit (fig 3-7). A
display provides operator interface, depending on
switch positions and keyboard entries, for displaying
manual and preset frequencies, offset frequencies,
time, CUE, and transceiver status during self test. The
function of each switch is described in table 3-8.
Figure 3-7. Control Panel AN/ARC-201
TM1-1520-238-10
Table 3-8. AN/ARC-201 Control Functions
Control
FUNCTION switch
OFF
TEST
SQ ON (Squelch
On)
SQ OFF (Squelch
Off)
RXMT
(Retransmit)
LD (Load)
LD-V (Load -
variable)
Z-A (Zero All)
STOW
MODE switch
HOM (Homing)
SC (Single
Channel)
FH
FH-M
(Frequency
Hopping -
Master)
Function
Selects basic operational condition of the transceiver.
Primary power is off. Memory holding battery power is on. Used during limited periods
of inactivity when reloading FH parameters and preset frequencies is not desirable, e.g.,
between missions or overnight.
Self test of the transceiver and ECCM function.
Power is applied to the transceiver and the squelch is enabled.
Power is applied to the transceiver and the squelch is inoperative.
Not used.
To load preset frequencies by normal keyboard entry, to fill ECCM net parameters and
lockout channels, and to reset time.
To load the TRANSEC variable into the transceiver for use with ECCM.
Pull and turn switch. Not an operational position. Zeros ECCM variables. Clears the
TRANSEC variable to avoid a security compromise.
Pull and turn switch. Removes all power from the transceiver, including memory holding
battery power. Used for extended storage.
Selects operational mode.
Not used.
Selects single channel mode of operation. Operating frequency is selected by PRESET
switch or keyboard entry.
Selects (FH) mode of operation. PRESET switch positions 1 to 6 select frequency hopping
net parameters.
Pull and turn switch. Designates control station as the time standard for all
communicating radios within a common net.
3-25
TM 1-1520-238-10
Table 3-8. AN/ARC-201 Control Functions - continued
Control
PRESET switch
MAN (Manual)
Positions 1
through 6
CUE
FM RF POWER
switch
Keyboard
Numbers 1
through 9
FREQ
SEnd OFST
(Offset)
TIME
Sto ENT (Store
Enter)
HoLD (Hopping
Load) / O
CLR (Clear)
VOL Control
FILL Connector
Function
Selects specific predetermined operating conditions within the transceiver.
In single channel mode, selects any operating frequency within the prescribed band, in
25 kHz increments, using the keyboard. Inoperative in FH modes.
In SC mode, preset frequencies are selected or loaded. In FH or FH-M mode, net
parameters are selected.
Used by a non-ECCM radio to signal an ECCM radio. In SC mode, this is a seventh
preset frequency.
Not used. Leave switch in OFF position.
To enter or display data, depending on the key switch actuated and the
MODE and FUNCTION switches.
To key in frequency, and load time information and frequency offsets.
positions of the
To display the current operating frequency during single channel manual or preset
operation. To load manual and preset frequencies.
To modify a single channel operating frequency which has been manually selected or
preset for offsets of ± 5 kHz or ± 10 kHz or to initiate a transmission if a hopset or
lockout set is in the holding memory and the MODE switch is set to FH-M.
To display or change the time setting maintained within each transceiver.
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