Critical: Before making any changes, . If you change a parameter and don't have the original value, "you CANNOT change it back to how it was" without specialized test equipment. There is no "factory reset" for these hidden settings, so this manual backup is your only safety net.
Used to calibrate the carrier frequency for different modes (USB, LSB, CW). AMC / Modulation
While holding both controls down, turn on the radio using the volume/power knob.
While AnyTone occasionally updates firmware revisions—which can alter the exact naming convention or index order of the engineering menu—the AT-5555N II service menu primarily controls these critical alignments: 1. Frequency Calibration (Reference Oscillator)
: The screen will display a firmware version or a specific engineering code (such as "CLE" or "SERVICE") to signal entry.
Once inside, you can navigate and adjust internal parameters: Navigation
For more information on the Anytone AT-5555N II and its service menu, you can: