Adjustment number by one, push to rear to switches decrease number by one.
MAR
Mode switch
RXMT SC Selects single channel mode of
TEST
operation.
AB0618
SA
FUNCTION
Selects manual channel mode of operation.
Selects VHF AM guard channel for transmit and receive. (Monitor
121.5 MHz only when SC AM, FM, or maritime presets are selected).
Selects VHF FM guard channel for transmit and receive. (Monitor
156.8 MHz, or 40.5 MHz only when SC AM, FM, or maritime presets are selected).
Adjusts volume of radio audio.
Not connected.
Enables transmit and receive.
Not connected.
Selects maritime preset channels.
Not connected.
Initiates built in test (BIT).

CONTROL/  FUNCTION 
INDICATOR 
ZERO  Not connected. 

3.8.4 Normal Operation.
3.8.4.1 Single Channel (SC) Mode.
NOTE
Initial battery power on and/or initial APU ac power on may cause COM 3 AN/ARC-222 to go squelch OFF mode -Via CDU Com 3 soft key and SETTING soft key, se-lect PT mode.
Momentary loss of power, such as switching from external to internal power, may cause changes in radio settings, to include tuning, band and mode of operation.
1.  
COM .xed function key -Press, to access COM SUM screen.

2.
SK-3 soft key -Press, to edit frequency or pre-set.

NOTE
If the radio is already in the desired band, and its preset and/or frequency desired is known, it may be edited on the COM SUM screen, and steps 4 thru 7 will be unneces-sary. To edit preset or frequency, ensure that preset or frequency has edit box around it. Enter new number in scratchpad, then ENT -Press.
3.  
BAND soft key -Press.

4.
Choose desired band by pressing the adjacent soft key. The band will be selected, and screen will change to COM summary screen.

5.  
SETTINGS soft key -Press, to access Settings screen.

6.  
TUNE soft key -Press, if desired to edit fre-quency. Enter new frequency in scratchpad, and ENT .xed function key -Press.

7.
ICS transmitter selector -Position 3 .

8.
Radio push-to-talk switch  -Press to talk; re-lease to listen.

3.8.4.2 Edit or Make Frequency Into PRESET.
1.  
DAT .xed function key -Press, to access MIS-SION DATA screen, then COMM soft key, to access COM PRESET screen.

2.  
VHF-AM, POLICE,or MARINE soft key -Press, to access desired preset screen.

NOTE
When a MARINE PRESET is changed, all other Marine Preset’s USA / ITU modes will be changed to current preset setting (for ex-ample, if the displayed preset mode is ITU, all Marine band presets will be changed to ITU when an edit is made to the displayed preset).
3. Use  PREV/NEXT rocker switch to display preset to change. Select .elds to edit with soft key, enter new values in scratchpad and press ENT to change displayed values.
3.8.5 Emergency Operation.
1.
On emergency control panel, EMERG COM switch -EMERG COM.

2.
Set mode switch on emergency control panel to band and channel desired.

3.
ICS transmitter selector -Position 3

4.
Radio push-to-talk switch  -Press to talk; re-lease to listen.

Change 3 3-33 3.9 HF RADIO SET AN/ARC-220 (COM 5).

Make sure that no personnel are within 3 feet of the HF antenna when transmitting or performing radio checks. Do not touch the RF output terminal on the antenna coupler, the insulated feed through, or the antenna itself while the microphone is keyed (after the tuning cycle is complete) or while the system is in transmit self-test. Serious RF burns can result from direct contact with the above criteria.
　
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