Cessna 1980 182Q Pilot's Operating Handbook And Flight Manual page 338

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CESSNA 400 NAV/COM
(RT-485A) WITH CESSNA
400 RNAV (RN-478A)
PILOT'S OPERATING HANDBOOK
SUPPLEMENT
2. COMMUNICATION OPERATING FREQUENCY READ OUT - Indicates COM
frequency in use. Third decimal place not shown.
3. CYCLE BUTTON (C) - Selects last illuminated decimal place on COM frequency
in use. Iflast decimal place is 2 or 7, pressing C pushbutton changes number to 5 or
0, respectively. If last decimal place is 5 or 0, pressing C pushbutton changes
number to 7 or 2, respectively. When the last illuminated digit on the set is 2 or 7,
the third digit on the set (not shown) will always be 5. When the last illuminated
digit on the set is 0 or 5, the third digit on the set (not shown) will always be
O.
Also
provides test function by holding C pushbutton pressed for more than 1.7 seconds.
This lights each COM and NA V MEMORY pushbutton in turn, and displays the
corresponding preset frequency in MEMORY.
4. NAVIGATION OPERATING FREQUENCY READOUT - Indicates NAV fre-
quency in use.
5. NA V MEMORY 1,2 & 3 PUSHBUTTONS - When a NAV MEMORYpushbutton is
pressed, the preset selected frequency will appear in the NAV frequency window
for use as the selected operating frequency. Each pushbutton will illuminate
white when pressed and the light will go out on the previously selected push but-
ton. Three preset frequencies may be stored in MEMORY and selected as desired,
by merely pressing the appropriate NAV MEMORY pushbutton to recall the
desired operating frequency. If electrical power to the set's "keep-alive" circuit
has not been interrupted, upon turn-on, the set will automatically recall the last
NAV MEMORY frequency selected by the MEMORY pushbutton.
If
electrical
power is removed from the set's "keep-alive" circuit (such as radio removal or
battery replacement) for more than 15 seconds. upon turn-on, the NAV MEMORY
circuits will have to be reset and NAV 1 MEMORY will automatically be selected
with the lowest operating frequency (108.000 MHz) selected.
6. ID-VOX-T SWITCH - In ID position. station identifier signal is audible; in VOX
(Voice) position, identifier signal is suppressed; in T (Momentary On) position,
the self-test function is selected. and the AP/CPLD annunciator illuminates
amber and the XMIT annunciator illuminates green.
7. NAVIGATION RECEIVER FREQUENCY SELECTORS - Outer knob changes
NAV frequency in I-MHz steps between 108 and 117 MHz; inner knob changes
NAV frequency in .05-MHz steps between .00 and .95 MHz; simultaneously selects
paired glide slope frequency and DME channel.
8. AUTOPILOT COUPLED ANNUNCIATOR (AP/CPLD) - Non-operational with
200A. 300A and 400 autopilots.
9. :,\A V VOLUME CONTROL (VOL) - Adjusts volume of navigation receiver audio.
10. SQCELCH CONTROL - Used to adjust signal threshold necessary to activate
CO:'>! receiver audio. Clockwise rotation increases background noise (decreases
squelch action); counterclockwise rotation decreases background noise
11. TRA:'\S:'>UT ANNUNCIATOR (XMIT) - Illuminates green when transmitter
output is normal while mike is keyed.
Figure
1.
Cessna 400 Nav/Com Set, Operating Controls and Indicators
(Sheet 2 of 4)
4
1 October 1979