Momentarily pressing the frequency transfer switch will
change the receiver control unit back to the standby
entry mode and will return the standby frequency
display to the frequency displayed before entering the
active frequency mode.
(3) Channel Mode. Pressing the channel
switch, placarded CHAN, will put the receiver control
unit into the channel mode. When in the channel
mode, the channel number is displayed in the active
frequency display and the channel frequency is
displayed in the standby frequency display. Channel
frequencies must be set with the unit in the program
(a) When the receiver control unit is in
the channel mode, the receiver will be tuned to the
frequency that is displayed in the standby frequency
display. If no channels have been programmed, the
receiver control unit will display channel 1 (CH 1) with
5 seconds, then the unit will tune the receiver to the
last frequency displayed in the active frequency
(b) Pressing the transfer switch for
2 seconds will change the receiver control unit to the
active frequency entry mode.
(4) Program Mode. The frequencies and
channel numbers used in the channel mode must be
programmed into memory with the receiver control unit
in the program mode.
(a) Pressing the CHAN switch for longer
than 2 seconds will put the receiver control unit into
the program mode. The channel number that was last
used will be displayed flashing in the active frequency
display. With the channel number flashing, rotating
the tuning knobs will change the channel number. A
channel number with no programmed frequency will
have dashes in the standby frequency display. In this
case the receiver will be tuned to the last valid
frequency displayed in the active frequency display.
Taking the receiver control unit out of the program
mode with dashes in the standby frequency display will
deprogram that channel. Pressing the frequency
transfer switch will cause the channel number to stop
flashing and the frequency to start flashing. Change
the frequency by rotating the tuning knobs. Pressing
the frequency transfer switch again will cause the
frequency to stop flashing and the channel to start
(b) The receiver control unit will return to
the standby frequency entry mode by pressing the
CHAN switch or a period of no activity for 20 seconds.
The frequency mode prior to channel or program mode
will be resumed, with the receiver tuned to the
frequency in the active frequency display.
d. Normal Operation.
1. Power and mode switch ANT, ADF, or
2. Tuning knobs Set desired frequency.
3. ANT function Position power and mode
switch to ANT. Select ADF on audio
system and adjust volume.
4. ADF function Position power and mode
switch to ADF. Bearing pointer will
indicate relative bearing to tuned station.
5. TONE function Position power and
mode switch to TONE (BFO). A 1000-Hz
tone will identify keyed CW stations.
1. Power and Mode Switch ADF.
2. Tuning Knobs Tune a nearby NDB,
compass locator, or broadcast station.
3. Power, Volume, and Mode Control
Knob Press to begin test. Bearing
previous valid indication. Press again
and verify that the bearing pointer
returns to previous valid indication.
If the signal received is weak or of poor
quality, bearing pointer rotation will be
3A-27. RADIO MAGNETIC INDICATORS (KNI 582).
a. Description. The pilot and copilot are each
provided with an identical Radio Magnetic Indicator
(RMI), which provides aircraft magnetic heading and
radio bearing information to a selected VOR, TACAN,
NDB, or FMS waypoint. The RMI's are powered
through two 1-ampere circuit breakers, placarded, RMI
NO. 1 and NO. 2, located on the right sidewall circuit
breaker panel, Figure 2-6.
b. RMI Controls and Functions (KNI 582).
Refer to Figure 3A-22.
(1) Heading Flag. The heading flag comes in
to view when heading information displayed on the
compass card is invalid.