USE frequency display
Frequency select knobs
OFF/VOL control switch
Figure 3-16. ADF Radio
The standby frequency is placed in memory when either
(b) Standby frequency. The standby
FLT (fight time) or ET (elapsed time) mode is selected.
frequency is displayed in the right portion of the display
(5) FLT/ET display. Flight time or elapsed
window when the FRQ message is displayed. In this
time are displayed and annunciated alternatively by
case, the standby frequency may be changed with the
depressing the FLT/ET button.
frequency control knobs as desired. If the standby
frequency is not being displayed, it may be called to the
(6) Frequency, select
window by pressing the FRQ button. Pressing this
button when the standby frequency is displayed causes
the current standby and active frequencies to be
(a) Active frequency.
frequency is displayed in the left portion of the window
(7) OFF/VOL control switch. Rotating this
display. This frequency may be changed with the
control switch clockwise out of detent turns the unit on.
concentric knobs when either time mode (FLT or ET) is
Further rotation of the control switch increases volume.
being displayed. To set the 10 digit, push the small knob
in and rotate it. Clockwise rotation will increment the
(8) SET/RST button. This button controls the
digit. The digit will roll over at 9 to 0 and roll under
elapsed time. Time is reset back to zero each time the
(when turning the knob counterclockwise) at 0 to 9. With
button is pressed. The elapsed times has a countdown
the small knob pulled out, the 1's digit may be set. It's
mode which is set by depressing the SET/RST button for
operation is the same as for the 10's digit.
2 seconds or until the ET display begins to flash. With
Turning the large knob changes the 100's digit and
the ET flashing, the selector knob will set any time up to
the 1000's digit. The 100's digit carries to the 1000's
59 minutes, 59 seconds. To start the elapsed time count
digit from 9 to 10 and borrows from 10 to 9. The two
down, press the SET/RST button and the timer will start
digits roll over from 17 to 02 and under from 02 to 17,
counting down. At zero the timer will begin to flash for
thus limiting the frequencies to the range of 200 kHz to
15 seconds and then go to a solid display.
3-26 Change 5