B737 ADF Control Panel

Frequency Indicator

• Shows the frequency selected with the related frequency selector.
• Indicates whether the system is in the ADF or antenna (ANT) mode.

Frequency Selector

• Rotate –
  • Outer knob sets the hundreds number.
  • Middle knob sets the tens number.
  • Inner knob sets the tenths and ones number.

Mode Selector

• ADF –
  • Audio reception possible.
  • ADF bearing sent to the DUs.
• ANT –
  • Audio reception optimized.
  • No ADF bearing data available.

TONE Switch

• OFF – Disables tones.
• ON – Adds tone to selected ADF receiver audio.

Transfer (TFR) Switch

• Selects ADF for display.