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appropriate radio line. should be set to 0. Options available are 0,
+5, -5, +10, -10. Offsets are in kHz. For
3. L-1/L-2/L-3/L-5  Press to display frequency example, 50.400 would become 50.405 if +5
list (3-8). were selected.
4. R-5  Press. Selected Radio Control page 8. If desired frequency is displayed, selected
will display. radio is set.
NOTE 9. If desired frequency is not displayed, but is
stored in frequency list, go to step 12.
• Channel and frequency shown on 10. If desired frequency is not stored in memory
selected Radio Control page will be the or channel number is not known, go to step
same as displayed on the RFD. 15.
• For emergency transmission, press EMER
T/R key. ON will display to the right, the NOTE
appropriate emergency frequency will
display at top of page, and the selected Channel number must be known to call up a
radio i s automatically tuned to the stored frequency. Channel numbers and
appropriate emergency frequency. To frequencies are listed on FREQ page.
deselect, press EMER T/R key again.
11. KYBD key  Press. Cursor will replace
• FM-1 and FM-2 share a common power KYBD.
amplifier. LO, MED, and HIGH modes are
run through this amplifier. If LO, MED, or 12. Channel number  Enter on MFK. Channel
HIGH power is selected for one FM radio, number will display in entry space.
the other FM will automatically set to
NORM and not utilize the power amplifier. 13. ENTER key  Press. Channel number,
When setting a power mode, always use frequency, and identifier will display at top of
the lowest power setting required for page and on RFD. Cursor will be replaced by
e f f i c i e n t operation. In the event of KYBD and radio w i l l be tuned to that
amplifier failure, the caution message IFM frequency. The selected radio is now set for
FAIL will display on the MFD and only operation. Steps 14 through 16 may be
normal power will be available. omitted.
5. PWR key  Press until desired power 14. KYBD key  Press. Cursor will replace
displays in PWR box. KYBD.
3-38
TM 1-1520-248-10
15. Frequency desired  Enter on MFK by radio position. Arrow pointing to crewmember
pressing first two digits, decimal point, and tuning radio will move to selected radio line
last three digits. Frequency entered will on RFD.
display. Verify frequency displayed is correct.
2. Pilot cyclic DSPL SEL switch (fig. 3-5) 
NOTE Press to right. COMM page (fig. 3-7) will
display.
• (CDS3) It is not necessary to enter a zero
(0) before the first two digits. Also, system 3. CHAN switch  Press up or down until
assumes zeros for digits after decimal desired channel is selected. Selected channel
point if nothing is entered. and frequency displays on RFD (fig. 3-1) and
that frequency is set for transmit.
• ( C D S 4 ) T h e s e s y s t e m f u n c t i o n s
automatically occur after ENTER is NOTE
pressed:
The frequency list has 18 preset channels
System automatically enters a zero for the first including a manual channel assigned to
character. each radio. The ARC-201Ds have an
System automatically enters a decimal after the additional CUE channel. The HF has one
third character. manual and nine preset channels.
If entry only has three numbers, system adds
three zeros to the end. 4. L-1 thru L-5  Press. FREQ list for selected
If entry only has four numbers, system adds two radio displays (fig. 3-8).
zeros to the end.
If the fifth character is 2, 5, or 7, the system
5. ADD key  Press. Cursor will display.
appends 5 as the last digit. If the fifth character is
not 2, 5, or 7, the system appends one zero to the
end. 6. Enter channel and frequency as desired.
16. ENTER key  Press. 7. ENTER key  Press. New frequency will be
displayed next to channel number entered
NOTE and that frequency is set for transmit.
The procedure loads a manual frequency. 3-34. CHANGING MANUAL FREQUENCY M1 or M5 (frequency entered) will display at
top of page and on RFD. Frequency will USING RFD AND REMOTE CONTROL SELECT
replace manual frequency listed on FREQ FM-1, FM-2, VHF, OR UHF.
page. KYBD will return to radio and is now
set for operation. NOTE
The transmit select switch on the CSC must
3-33. CHANGING STORED FREQUENCY be in RMT before remote selection of RFD
USING REMOTE CONTROL SELECT FM-1, FM- displays.
2, UHF, OR VHF.
1. Radio  Select by placing radio select switch
NOTE on the pilot collective control head (fig. 3-3)
to desired position or rotating transmit
The transmit select switch on the CSC must selector switch on the CSC panel (fig. 3-2) to
　
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