What happens when ADF switch 1 or 2 is selected?

What happens when ADF switch 1 or 2 is selected?

• A. The radio transmits on 2 meters
• B. The ADF is reset to default
• C. 115 VAC is enabled to the direction finder’s antenna motor
• D. ADF is muted

Answer: (C)

Selecting the ADF switch energizes the direction finder’s antenna motor. The ADF relies on a motor-driven sense/loop antenna to determine bearing to an NDB, and that motor requires 115 VAC. When you choose either position, power is routed to the motor for the corresponding direction finder, causing the antenna to operate and provide a bearing reading. This action doesn’t involve transmitting on the 2-meter band, nor does it reset or mute the ADF—the switch’s job is simply to power the appropriate ADF antenna motor.

Selecting the ADF switch energizes the direction finder’s antenna motor. The ADF relies on a motor-driven sense/loop antenna to determine bearing to an NDB, and that motor requires 115 VAC. When you choose either position, power is routed to the motor for the corresponding direction finder, causing the antenna to operate and provide a bearing reading. This action doesn’t involve transmitting on the 2-meter band, nor does it reset or mute the ADF—the switch’s job is simply to power the appropriate ADF antenna motor.