Do not attempt to adjust the service menu purely "by ear" or by relying on reports from a friend down the street. To perform a safe and accurate calibration, you need:
The AnyTone AT-5555N II features a powerful but undocumented used for factory-level alignments, including power output limits and frequency fine-tuning. ⚠️ Critical Warning
Press and hold the and MODE buttons simultaneously while turning the power ON .
Press and hold the FUNC (Function) key and the PUSH (Channel selector knob) simultaneously. anytone at-5555n ii service menu
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.
: As soon as the display turns orange (within that 2-second window), release the Menu and Mode buttons and quickly press the following buttons in exact order: DW → RB → NB → SCAN → MEM → EMG
I can provide more targeted steps to safely or help you interpret your current menu settings. Share public link Do not attempt to adjust the service menu
Allow the transceiver to sit powered on for at least 15 to 30 minutes before calibrating the frequency oscillator. This ensures internal components reach thermal equilibrium. Conclusion
I can provide the targeted calibration steps for your exact scenario. Share public link
Instead of accessing the service menu, most users can optimize their AnyTone AT-5555N II experience through standard operations: Press and hold the FUNC (Function) key and
Press the PUSH knob or the FUNC key (depending on your firmware version) to highlight the value, then rotate the channel knob to increase or decrease the setting.
Complete Guide to the AnyTone AT-5555N II Service Menu: Calibration and Hidden Settings
Never transmit into an antenna while adjusting service menu parameters. Connect a high-quality 50-ohm dummy load to protect the final transistors.
Fine-tunes the percentage of AM modulation. Setting this too high causes clipping; setting it too low results in quiet, weak audio. 4. S-Meter Calibration (RX / SQ)
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