Do you have a question about the AOR AR2002 and is the answer not in the manual?
Power switch for the receiver.
Squelch control to adjust noise threshold.
Volume control for audio output.
BNC type antenna connector.
Jack for connecting a 12V DC power supply.
Attenuator switch to reduce signal strength.
Search across a wide frequency range.
Search within a specified frequency range.
Monitor a specific channel while scanning.
Frequency coverage of the receiver.
Sensitivity levels for different modes.
Selectivity characteristics for different modes.
Rejection levels for image and spurious signals.
Check power plug connection and polarity.
Check volume, squelch, and earphone jack.
Check MANUAL key and squelch knob.