The service menu breaks down power calibration by mode. You will typically find separate parameters for: Sets the dead-carrier wattage for FM.
Note: Pushing the power limits past factory specifications will cause severe harmonic splatter and will quickly destroy the final amplifier stages. 3. S-Meter and SWR Meter Calibration (RX S-MTR / SWR)
Capable of reading up to 30 MHz with high precision to verify the reference oscillator.
: Altering service menu parameters usually voids your manufacturer warranty. anytone at-5555n ii service menu
If you must adjust the settings, follow this precise workflow to prevent hardware failure. Use a Dummy Load
: Never adjust alignment settings without a calibrated dummy load, power meter, and frequency counter.
Final notes and best practices
Press and hold the FUNC (Function) key and the PUSH (Channel selector) knob simultaneously.
Change the transceiver mode to the target band (e.g., AM or FM) via the switch.
Performing a standard user-menu reset will not restore the service menu to factory defaults. The service menu breaks down power calibration by mode
You should never adjust service menu settings blindly or by relying on "on-the-air" audio reports. To properly align the AT-5555N II, you need the following diagnostic equipment:
The provides advanced radio operators and technicians with direct control over internal alignments, power outputs, frequency offsets, and modulation parameters directly from the front panel. It bypasses standard background programming software, allowing real-time calibration of Single Sideband (SSB), Amplitude Modulation (AM), and Frequency Modulation (FM) modes.
To enter the service menu, follow this specific power-on sequence: If you must adjust the settings, follow this