Anytone At5555n Ii Service — Menu Updated

: Turn the radio off to save and exit the service menu. Common Service Menu Items

Aligns the master clock so that your transmitted and received frequencies perfectly match the digital readout. anytone at5555n ii service menu updated

If you calibrate the frequency immediately after turning the radio on, it may drift as the internal components warm up. Always let the AT-5555N II sit powered on for at least 15 to 30 minutes to reach its operational temperature equilibrium before performing service menu calibrations. Conclusion : Turn the radio off to save and exit the service menu

| Menu Code | Function | Description & Notes | | :--- | :--- | :--- | | | TX Power Adjustment | Sets the maximum RF power output. usually adjustable for High/Mid/Low bands. Caution: Setting this too high can destroy the final transistors (RD70/RF transistors). | | S-02 / AS | ALC Level | Automatic Level Control. Prevents over-modulation. If set too low, audio will be quiet; too high, audio will distort. | | S-03 / SO | S-Meter Sensitivity | Calibrates the signal strength meter. Requires a calibrated signal generator. | | S-04 / FT | Frequency Tolerance | Adjusts the reference oscillator voltage (VC voltage). Used to correct off-frequency transmission. Connect a frequency counter to the antenna port and adjust until the carrier is exactly on frequency (e.g., 28.500000 MHz). | | S-05 / BT | Battery Voltage Display | Calibrates the voltage readout on the LCD display. Use a multimeter on the power input and adjust menu to match. | | S-06 / DE | Deviation Adjustment | Sets the FM deviation level. Critical for ensuring your voice is intelligible and not "clipped." | | S-07 / SQ | Squelch Threshold | Sets the point where the squelch opens (often set to 0.15uV or 0.2uV). | Always let the AT-5555N II sit powered on

The firmware updates on newer production runs of the AT-5555N II have standardized the key combination required to enter the alignment mode. Step-by-Step Access Procedure: Turn the radio using the volume/power knob.

If the radio is slightly off-frequency, use the loC (Local Oscillator) setting, as suggested in technical forums.