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Outside of the United States
some stations are unmodulated and
use an interrupted carrier for
identification purposes. The BFO
mode, activated and annunciated
when the "BFO" button is depressed,
permits the carrier wave and the
associated Morse code identifier
broadcast on the carrier wave to be
heard.
ADF Test
(PRE-FLIGHT OR IN-FLIGHT)
Select ANT mode. This will cause the
bearing pointer to move directly to the
parked 90° position. Make sure the
unit is tuned to a usable frequency.
Now select ADF mode and the needle
should move without hesitation to the
station bearing. Excessive
sluggishness, wavering or reversals
indicate a signal that is too weak or a
system malfunction.
Operating the Timers
The flight timer will always be
automatically reset to :00 whenever
power is interrupted either by the
avionics master switch or the unit's
ON/OFF switch. An optional external
switch may be installed which, when
activated, will stop or start the flight
timer. This switch would be of use
during a nonrefueling stop when
resetting the flight timer is not desired.
On some aircraft it may be desirable
to use the aircraft strut switch instead
of a manual switch to stop and start
the flight timer. It should be
emphasized that the start/stop
function will only operate with power
applied to the unit. Always read flight
time prior to power shutdown.
Flight time or elapsed time are
displayed and annunciated
alternatively by depressing the
FLT/ET button. The flight timer
continues to count up until the unit is
turned off or stopped with an external
switch. The elapsed timer may be
reset back to :00 by pressing the
SET/RST button. It will then start
counting up again.
NOTE: Pressing the SET/RST button
will reset the elapsed timer whether it
is being displayed or not.)
The elapsed timer also has a
"count-down" mode
To enter the countdown mode,
the SET/RST button is depressed for
about two seconds, or until the "ET"
annunciation begins to flash. It is now
in the ET set mode, and a time up to
59 minutes, 59 seconds may be
preset into the elapsed timer with the
concentric knobs. The preset time will
be displayed and remain unchanged
until SET/RST is pressed again,
which will start the elapsed timer
counting down from the preset time.
When the timer reaches :00 it will start
to count up as the display flashes for
15 seconds and an aural alarm, if
installed, is activated for about 1
second.
NOTE: The standby frequency which
is in memory while flight time or
elapsed time modes are being
displayed may be called back by
KR 87
43
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