3.5.3.5 Receiver selection.
1. Receiver selection switch(es) -RADIO MON and NAV knobs -pull to monitor, push to turn audio off. Rotate to adjust individual audio level.
2. Adjust master volume to comfortable listening level.

3.6 RADIO SET AN/ARC-201D (VHF-FM) (COM 1 AND 4).
Radio set AN/ARC-201 (Figure 3-10) is an airborne, very high frequency (VHF), frequency modulated (FM), radio receiving-transmitting set compatible with the Single Channel Ground Airborne Radio Sets (SINGCARS) Elec-tronic Countermeasures (ECCM) mode of operation. The set provides communications of voice and data, secure or plain text, and homing over the frequency range of 30 to
87.975 MHz channelized in 25 Khz steps. A frequency off-set tuning capability of -10 Khz, -5 Khz, +5 Khz and +10 Khz is provided in both transmit and receive mode; this capability is not used in ECCM mode. This set is used for receiving and transmitting clear-voice or X-mode commu-nications. Secure voice capability is embedded in the radio. Each radio provides 6 preset channels, a manual channel and a cueing channel, for use in the frequency hopping (FH) mode. Each channel has the capability to select dis-crete frequencies in a single channel mode, or FH radio nets in the FH mode. The No. 1 AN/ARC-201 is referred to as COM 1, and the No. 2 AN/ARC -201 radio is referred to as COM 4, corresponding to their positions on the ICS mode select switch. Use of the homing capability of the No. 1 (COM 1) FM radio set provides a steering output to the VSI course deviation pointer for steering indications. COM 1 VHF-FM receives power from the dc essential bus through a circuit breaker marked NO. 1 VHF-FM. COM 4 VHF-FM receives power from the No. 1 dc primary bus through a circuit breaker marked NO. 2 VHF-FM.
3.6.1 Antennas.
a. The COM 1 VHF-FM communications antenna is on top of the tail rotor pylon (Figure 3-1). The COM 4 VHF-FM antenna is within the leading edge fairing of the tail pylon drive shaft cover. The FM homing antennas, one on each side of the fuselage, are used with FM No. 1 radio set.
3.6.2 Controls and Functions. Both AN/ARC-201 ra-dios are controlled by the AMS with the CDU (Figure 3-2). Control screens allow the pilot to choose frequency and mode of transmission (Figure 3-10). Operator functions are to change band, transmission frequency and mode, and edit and establish preset modes and frequencies. Bands associ-ated with this radio are:
TM 1-1520-253-10
BAND FIELD BAND NAME FREQUENCY RANGE
FM 1, FM 4  FM  Single 30.000 to 87.975 
channel  (Manual is preset 
1) 
FILL 1, FILL 4  FH- COLD  30.000 to 87.975 
COLD 1,  FH  -COLD  30.000 to 87.975 
COLD 4  (Always preset 0) 
CUE 1,CUE 4  FH  -CUE  30.000 to 87.975 
(Always preset 0) 
FH 1,FHM 1,  FREQ HOP  NET: 001 to 
FH 4, FHM 4  NET:999 
(SINCGARS 
NETS) 
COM 1, COM 4  Indicates radio is 
inoperative. 

3.6.2.1 COM Summary Screen. The COM SUM screen allows the operator to perform all primary radio con-trols. SK1 selects COM 1, and SK4 selects COM 4 settings for editing
SOFT KEY  FUNCTION
SK-1  Selects and then toggles between COM 1 frequency and preset .eld for editing.
SK-4  Selects and then toggles between COM 4 frequency and preset .eld for editing.
LAST  Restores the last manually tuned frequency, while saving the current settings. This function saves one setting per band of operation.
EMERG  Swaps current frequency with the band based guard frequency for radio that has been selected for edit.
PT/CT  Toggles between plain mode (PT) and secure mode (CT) transmission for radio that has been selected for edit.
BAND  Access Band selection screen for radio that has been selected for edit.
　
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