The service menu allows for deep internal alignment and calibration. Because there is no factory reset for these settings, it is vital to record every original value before making changes. 🛠️ Accessing the Service Menu To enter the service menu, follow these steps exactly: Ensure the radio is OFF .
| Menu Item | Function | Typical Adjustment | |-----------|----------|---------------------| | | PLL Reference Frequency (Coarse) | Adjust for frequency counter accuracy | | S-04 | AM Power (Low) | Sets carrier level on AM mode | | S-05 | AM Power (High) | Sets peak AM power | | S-07 | SSB Power (Low) | ALC threshold for low SSB | | S-08 | SSB Power (High) | ALC threshold for high SSB | | S-11 | FM Deviation | Sets FM modulation width | | S-20 | S-Meter Zero (No signal) | Adjust until meter reads S0 with antenna disconnected | | S-21 | S-Meter Calibration (S9) | Inject S9 signal (50µV) and adjust | anytone at-5555n ii service menu
: Never adjust alignment settings without a calibrated dummy load, power meter, and frequency counter. The service menu allows for deep internal alignment
Incorrect adjustments that result in blown finals or bricked firmware are generally not covered under standard manufacturer warranties. How to Exit and Save Once you have completed your alignment: | Menu Item | Function | Typical Adjustment
Before entering the service menu, you must understand that these settings directly control the radio's internal alignment.
While exact parameters can shift across manufacturing batches, the core alignment groups include: 1. Frequency Calibration (REF / FREQ)
: Release the PTT to save the new value for that specific menu item. Exit : Turn the radio OFF to exit the service mode. Key Service Menu Items Setting Name CH-17 AMPOWL
