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aircraft bearing to station, and audio outputs to the navigation and audio systems.
Components and Operation
The ADF receivers are an integral and functional part of the VHF navigation receivers. A dual ADF
antenna is located on the bottom of the fuselage, forward of the wing root.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−51
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUTOMATIC DIRECTION FINDING SYSTEM (CONT'D)
ADF System Components
Figure 17−10−52
ADF Audio
The ADF 1 and ADF 2 audio controls, on the audio control panel, are used to turn ON or OFF,
and adjust the volume of, the ADF receiver audio.
ADF Audio Control
Figure 17−10−53
Tuning and Control
ADF functions are tuned and controlled via the CDUs, or through the MFD tuning windows.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−52
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUTOMATIC DIRECTION FINDING SYSTEM (CONT'D)
CDU Tuning
Tuning of the ADF may be carried out from the TUNE page displayed on the CDUs. ADF
receiver titles, ADF 1 and ADF 2, are shown on page 1 of the TUNE page. Active frequencies
appear in green on the data line directly below the corresponding radio title. There is no recall
frequency line key for the ADFs.
Direct tuning from the CDU is carried out by first keying in the desired frequency on the
scratchpad, followed by pushing the ADF (1 or 2) line key. This moves the scratchpad frequency
to the ADF frequency line.
ADF Control Page
Selecting an ADF (1 or 2) line key with the scratchpad empty provides access to the ADF (1 or
2) CONTROL page. The ADF CONTROL page provides control display of the following:
• ADF test;
• Mode selection (ADF/ANT);
• BFO (ON/OFF); and
• ADF presets.
Selection of ADF test causes the word “TEST” to enlarge and show in cyan. The ADF bearing
on the flight displays rotates clockwise 90 degrees. Test duration is approximately 10 seconds.
In the ADF mode, the ADF receiver provides bearing-to-station output to the flight displays. In
the ANT mode, the ADF sensitivity is increased. It receives station signals at long range, but
does not provide bearing information to the flight displays.
NOTE
When HF communications is required and the microphone is keyed,
the ADF pointers will freeze during HF transmissions.
The beat frequency oscillation (BFO) function adds a 1020 Hz audio tone to the normal audio
output. Depending on the method of transmission used by the ground station, BFO operation
aids in making the station’s identifier signal more audible. When BFO is selected, the BFO text
enlarges, and is shown in cyan.
Up to 20 preset frequencies for the ADF systems may be entered on the ADF CONTROL page.
Preset frequencies are entered on the scratchpad, then selected to a preselect key. A preselect
frequency is made active by first selecting the desired frequency to the scratchpad, followed by
selecting the active ADF frequency.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−53
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUTOMATIC DIRECTION FINDING SYSTEM (CONT'D)
ADF CONTROL Page
Figure 17−10−54
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−54
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUTOMATIC DIRECTION FINDING SYSTEM (CONT'D)
MFD Tuning
ADF tuning and control may also be carried out from the MFD tuning window. Active
frequencies appear in green on the data line directly below the corresponding radio title. There
is no recall frequency line key for the ADFs.
The ADF submenu on the MFD provides control display of the following:
• ADF test;
• Mode selection (ADF/ANT); and
• BFO (ON/OFF).
The cyan transfer symbol is shown on the Main and Control menu when valid frequencies are
available. The FREQ button on the CCP is used to swap the frequencies.
ADF Tuning and Control
Figure 17−10−55
ADF Display
ADF data is available as a source for the flight display bearing pointers. The ADF bearing
pointers are selected from the BRG SRC button on the DCPs, or via the BRG SRC submenu.
The ADF bearing data is available for presentation on the ROSE and PPOS format on the PFDs
and MFDs. The bearing pointer is automatically removed should the associated ADF receiver
fail.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−55
Oct 05/06
CL−605 Flight Crew Operating Manual
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