Cessna 1980 182Q Pilot's Operating Handbook And Flight Manual page 349

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PILOT'S OPERATING HANDBOOK CESSNA 400 TRANSPONDER
SUPPLEMEr-rT AND ALTITUDE ENCODER (BLIND)
3. DIM Control -- ADJUST light brilliance of reply lamp.
NOTE
During normal operation with function switch in ON
position, reply lamp flashes indicating transponder re-
plies to interrogations.
4. ID or XPDR IDENT Button -- DEPRESS momentarily when
instructed by ground controller to "squawk IDENT" (reply lamp
will glow steadily, indicating IDENT operation).
TO TRANSMIT MODE C (ALTITUDE REPORTING) CODES IN FLIGHT:
1.
Reply-Code Selector Switches -- SELECT assigned code.
2. Function Switch -- ALT.
NOTE
When directed by ground controller to "stop altitude
squawk", turn Function Switch to ON for Mode A opera-
tion only.
NOTE
Pressure altitude is transmitted by the transponder for
altitude squawk and conversion to indicated altitude is
done in ATC computers. Altitude squawked will only
agree with indicated altitude when the local altimeter
setting in use by the ground controller is set in the aircraft
altimeter.
3. . DIM Control -- ADJUST light brilliance of reply lamp.
TO SELF-TEST TRANSPONDER OPERATION:
1.
Function Switch -- SBY and wait 30 seconds for equipment to
warm-up.
2. Function Switch -- ON.
3. . TEST Button -- DEPRESS (reply lamp should light brightly
regardless of DIM control setting).
4. TEST Button -- RELEASE for normal operation.
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