Specifications

SECTION III
MODEL 560 INSTRUMENTATION AND AVIONICS
AUTOMATIC DIRECTION FINDER - COLLINS ADF-462 (Optional)
The Collins ADF-462 is controlled by a CTL-62 electronic control head mounted on the right side of
the center instrument panel. The automatic direction finder system operates in the frequency range of 190
to 1749.5 KHz. The CTL-62 control panel uses two digital readouts to display the controlling (active)
frequency and a pilot-selected preset frequency. Dual concentric frequency select knobs control the display
chosen by the ACT switch. When pressed, the ACT switch consecutively cycles the tuning modes between
ACT (active) and preselect tuning. When preselect tuning is selected, both displays are illuminated and the
bottom (preset) display is tuned. When ACT (active) tuning is selected, the active (top) display is directly
tuned and dashes show in the preset display.
In addition to the active and preset frequencies, four additional frequencies can be stored in memory
to be called up by use of the XFR/MEM switch. The XFR/MEM switch is spring-loaded to the center
position. Pressing the switch to the MEM position loads a frequency in the preset display from memory and
advances the memory location one space. Pressing the XFR/MEM switch to XFR exchanges the preset
and active frequencies.
The STO (store) switch, when pressed once, displays the location number of the available memory
frequency. When pressed twice, the STO switch stores the preset frequency in the available memory.
A comparator annunciator (ACT) illuminates when the displayed radio control frequency and the actual
radio frequency are not identical.
A rotary function selector switch has OFF, ANT, ADF and TONE positions. ANT position facilitates
aural identification of the selected stations. ADF position provides bearing-to-station readings for the RMIs.
TONE provides a tone for identification of keyed CW stations. Volume is controlled by a knob concentric
with the function selector switch. The TEST button initiates a self-test; the ADF pointer on the PFD (and
the standby HSI, NAV 1 only) will change 90 degrees and a row of annunciators at the bottom of the
frequency display provides annunciation of pertinent systems. When ANT is selected or if the signal is lost,
the ADF pointer on the RMI will park in the horizontal position. When ADF is not required for navigation,
place the selector in ANT to eliminate excessive radio magnetic indicator (RMI) needle seeking.
A second ADF-462 may be installed, in which case the first system is duplicated with a second
complete system, and operation of the second ADF is identical to the first. If a second ADF is installed, its
bearing information may be displayed on the double barred needle (
~ ) on either PFD when that ADF is
selected on the respective DC-550.
Figure 3-16. CTL-62 Control Panel
I 56OMB-01 Configuration AA 3-31