3.8.2 Controls and Functions. The AN/ARC-222 radio is controlled by the AMS with the CDU (Figure 3-2), or in emergency by a control panel (Figure 3-13). Control screens allow the pilot to choose frequency and mode of transmission (Figure 3-12). Operator functions are to change band, transmission frequency and mode, and edit and establish preset modes and frequencies in normal mode. Bands associated with this radio are:
BAND FIELD BAND NAME FREQUENCY RANGE
FM-3  FM-SC  30.000 to 87.975 
VHF-AM  VHF-AM  108.000  to 
135.975 
POLC  HF AM Police  136.000  to 
173.995 
MRN  Marine  CH:001  to 
CH:028  and 
CHN:060  to 
CH:088 

3.8.2.1 COM Summary Screen. The COM SUM screen allows the operator to perform all primary radio con-trols. SK-3 selects COM 3 (AN/ARC-222) for edit. Soft key labels and functions visible when SK-3 is selected are:
SOFT KEY  FUNCTION
gSK-3  Selects and then toggles between COM 3 frequency and preset .eld for editing.
gLAST  Restores the last manually tuned frequency, while saving the current settings. This function saves one setting per band of operation.
EMERGs  Swaps current frequency with the band based guard frequency for radio that has been selected for edit.
BANDg  Access Band selection screen for radio that has been selected for edit.
SETTINGSg  Access Settings screen for radio that has been selected for edit.
3.8.2.2 Band Screen. The current operating band is shown in inverse video. When the pilot pushes a soft key for a new mode, that mode is selected, and the screen re-turns to either the COM summary screen or the Setting screen previously in use.
SOFT KEY  FUNCTION
sVHF-AM  Selects VHF -AM single channel, returns to previous screen.
sFM-SC  Selects VHF -FM single channel, returns to previous screen.
sPOLICE  Selects Police band, returns to previous screen.
MARINEg  Selects Marine band, returns to previous screen.
MARINE  Selects Marine shore band, returns
SHOREg  to previous screen.
RTNg  Returns to previous screen without changing selected band.
3.8.2.3 Settings Screen. Setting screen allows setting of secondary radio controls and selection of a new preset.
SOFT KEY  FUNCTION
COM 3 -******  Screen header, giving COM selected, and band. If radio is not working, ***** is displayed.
gPRESET  Selects number in scratchpad as frequency preset number.
gTUNE  Selects frequency .eld for editing.
BANDg  Access Band screen for this radio.
SQUELCHs  Toggles squelch ON or OFF.
RTNg  Returns to previous screen without changing settings.
3.8.3 Emergency Controls and Functions. The emergency control panel for the COM 3 VHF radio set is located on the lower console. Functions COM 3 in emer-gency operation are limited to FM single channel, VHF single channel, Marine and Police band. No crypto func-tions are available. Switch positions that have no function in this operation are listed as not connected. The function of each control is as follows:

DISPLAY / INDICATOR

CONTROL/
CONTROL/  FUNCTION INDICATOR
INDICATOR MN
CHAN switch  Selects channels. Pressing the switch to rear momentarily will decrease the channel number by
EA
one. Pressing and holding the switch to rear more than two seconds will decrease the channel number by one, and then access MN channel. Pressing switch to front EF momentarily increases the channel number by one. Pressing switch to front and holding more than 2 seconds increases the channel number by one, and then access

VOL
preset channel 20. Function Switch
Display/indicator  Displays single channel preset numbers, frequencies, BIT status OFF and other messages.
　
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