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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