*
NAV filter selector.

VOR/ADF Selector
The VOR/ADF receiver selector lets you select VOR or ADF as the source of audio.
VOR/ADF Receiver Volume Control
The VOR/ADF receiver volume control makes the audio come on and controls the volume.
NAV Filter Selector
The NAV filter selector lets you select one of these:
*
Voice (V) audio

*
Both (B) voice and range audio

*
Range (R) audio.

Operation
Do this to hear ADF audio:
*
Set the VOR/ADF selector to the left (L) or right (R) ADF position

*
Push the VOR/ADF receiver volume control to make the ADF audio come on (turn the control to adjust the volume)

*
Set the NAV filter selector to the voice (V) position.

To hear the station identifier, set the NAV filter selector to either the both (B) or the range (R) position.
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ADF SYSTEM -AUDIO CONTROLS

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ADF SYSTEM -CDU ADF TUNING

General
The CDUs supply manual tune inputs during normal operation and alternate tune inputs when the AIMS tune function fails.
Operation
To see ADF tune frequencies, push the NAV RAD key on the CDU. The NAV RADIO page shows data for the left and right ADF systems.
To manually tune an ADF receiver, enter a valid ADF frequency into the scratchpad. Push line select key 3L or 3R to enter the frequency for left or right ADF receiver.
You cannot use the delete key to delete an ADF frequency.
Alternate Tune
The ALTN NAV RADIO page is available only when the tune inputs from the AIMS cabinets fail.
To get to the ALTN NAV RADIO page, push the NAV RAD key on the CDU.
The ALTN NAV RADIO page is different from the NAV RADIO page. The ALTN NAV RADIO page shows data for only the onside NAV radio systems. The left CDU ALTN NAV RADIO page controls the left ADF receiver and the right CDU ALTN NAV RADIO page controls the right ADF receiver.
Antenna (ANT) Mode
In the antenna (ANT) mode, the ADF receiver uses only the sense antenna to receive station audio broadcasts. To select the ANT mode, enter the letter A after the frequency, then line select the data to the ADF data line. When you enter the frequency, ANT shows after the frequency.
To delete the ANT mode, push the delete key on the CDU. The delete function shows in the CDU. Next, push the line select key next to the ADF line to delete the ANT.
Beat Frequency Oscillator (BFO) Mode
The ADF receivers can detect the station Morse code identifier if the 1020 Hz signal is amplitude modulated with the station audio signal. The ADF receiver can not detect the station Morse code identifier if the signal is a keyed Morse code signal. To hear the station morse code identifier, you must select the BFO mode. To select the BFO mode, type the letter B after the frequency and line select the data to the ADF data line. When you enter the frequency, BFO shows after the frequency.
To delete the BFO mode, push the delete key on the CDU. The delete function shows in the CDU. Next, push the line select key next to the ADF line to delete the BFO.
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ADF SYSTEM -CDU ADF TUNING

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ADF SYSTEM -EFIS CONTROLS

General
The EFIS control panel has controls to select ADF data to show on the navigation displays (NDs).
VOR/ADF Switch
The VOR/ADF switches select the VOR or ADF receivers as the source of data for the left and right bearing pointers on the ND. There are two switches, one for the left bearing pointer and one for the right bearing pointer. When the switches are set to the off position, the bearing pointers and ADF data goes out of view.
Alternate or Backup EFIS Control Panel
The EFIS control page on the CDU supplies backup controls for the EFIS control panel. To select ADF data for the bearing pointers, push the OPTIONS line select key on the EFIS control page. This brings up the EFIS OPTIONS page.
Push the line select key next to the OFF-ADF-VOR data line on the EFIS OPTIONS page to toggle between ADF or VOR data.
The active mode shows in large letters.
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777 AIRCRAFT MAINTENANCE MANUAL

ADF SYSTEM -EFIS CONTROLS

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