Anytone At-5555n Ii Service Menu -
The AnyTone AT-5555N II service menu is a powerful diagnostic and calibration tool, not a toy for "free power." When used with proper test equipment (frequency counter, watt meter, dummy load), it can resurrect a radio that has drifted off frequency or fix low modulation.
When used carelessly—with a screwdriver in one hand and a YouTube video on a phone in the other—it is a fast track to releasing the "magic smoke" from your final transistors.
Final checklist before entering the service menu:
If you answered "Yes" to the first three and "Defect" to the fourth, proceed with confidence. If not, close the hood and enjoy your AT-5555N II as it left the factory—it is already an excellent radio.
Disclaimer: This article is for educational and informational purposes only. Modifying your radio may violate FCC or local telecommunications regulations. The author assumes no responsibility for damage to equipment or legal issues arising from the misuse of the service menu. anytone at-5555n ii service menu
Title: Operational Analysis and Technical Procedures: Accessing and Interpreting the Service Menu of the AnyTone AT-5555N II
Abstract
This paper provides a comprehensive technical guide to accessing, navigating, and interpreting the service (alignment) menu of the AnyTone AT-5555N II multi-band mobile transceiver. Often referred to as the "hidden menu," this interface is critical for technicians performing maintenance, frequency alignment, and power calibration. This document outlines the entry protocols, delineates the function of key menu parameters, and discusses the implications of misconfiguration. The paper aims to serve as a standardized reference for radio service professionals and advanced amateur radio operators seeking to restore the device to factory operational specifications.
The method differs slightly depending on the specific firmware version of your radio, but the following method is standard for the N-II series: The AnyTone AT-5555N II service menu is a
Method A (Standard):
Method B (Alternative - if A fails):
If your AT-5555N II is heard "off frequency" on SSB (e.g., you sound low pitch or high pitch to other stations):
Note: The exact order and numbering may vary by firmware version. If you answered "Yes" to the first three
| Item | Description | Notes | | :--- | :--- | :--- | | S1 / S2 | S-Meter Calibration | Adjusts the signal strength bar display. S1 is usually the "hang" threshold; S9 is the high signal threshold. Requires a calibrated signal generator for accuracy. | | PO (Power Output) | RF Power Adjustment | Sets the maximum power output for High, Mid, and Low settings. Usually, you select the power level on the front panel first, then adjust the value in the service menu. | | MAX FREQ | Frequency Expansion | Sets the upper and lower frequency limits. Often used to "unlock" the radio for extended Tx/Rx ranges (e.g., 24.000 MHz – 32.000 MHz). | | SQL (Squelch) | Squelch Threshold | Sets the point where the audio mutes in the absence of a signal. | | MIC | Microphone Gain | Adjusts the modulation depth. Too high causes distortion; too low makes you sound quiet. | | BFO | Beat Frequency Oscillator | Adjusts the frequency offset for USB/LSB modes. Critical for clear SSB voice quality. | | TCXO / FREQ CAL | Frequency Calibration | Used to correct frequency drift. If your voice sounds "off-frequency" to others, this corrects the reference oscillator. | | AM CAL | AM Modulation | Sets the modulation percentage for AM mode. |
If the button combination fails:
Proceed at your own risk. Entering the service menu and changing values incorrectly can:
Recommendation: Write down the original value of every setting you change. Do not adjust anything unless you own a calibrated frequency counter, a watt meter with a dummy load, and an oscilloscope (for modulation).