Anytone At-5555n Ii Service Menu

Controls how wide the signal spreads in FM mode. It should be strictly limited (typically to 2.5 kHz or 5.0 kHz depending on local regulations) to avoid bleeding into adjacent channels.

Ensure your DC power supply is delivering a stable 13.8V. Do not let the radio overheat while testing continuous carrier modes like AM or FM.

If you are qualified to perform an alignment on the AT-5555N II, always follow these procedural rules:

Before considering any modifications to the internal settings of a transceiver, it is vital to understand the risks involved. The service menu is intended for use by qualified technicians with specialized calibration equipment. anytone at-5555n ii service menu

This calibrates the internal Standing Wave Ratio meter. It ensures the radio accurately reads reflected power to protect itself from antenna mismatches. Essential Tools for Service Menu Adjustments

There are two distinct menu systems on the AT-5555N II: the standard menu for regular users, which contains basic operational parameters, and the hidden service menu for factory-level adjustments. Accessing the service menu requires a specific button sequence during the startup process. While exact sequences can vary between firmware versions, the most commonly reported method is as follows.

Instead of accessing the service menu, most users can optimize their AnyTone AT-5555N II experience through standard operations: Controls how wide the signal spreads in FM mode

The AT-5555N II is typically factory-set for 28.000–29.700 MHz. Users often seek to expand frequency coverage.

Once adjustments are complete, press the FUNC or MEM button (depending on the exact firmware revision) to write the new data to the EEPROM, or simply power the radio off and back on to finalize standard parameters. Key Service Menu Parameters Explained

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: Do not let the radio overheat while testing

The Service Menu isn’t a set of regular user options (like RF gain or mic gain). Instead, it’s a protected diagnostic area used at the factory to calibrate:

Unlike older analog CB and amateur radios that required a technician to turn physical adjustment pots (potentiometers) inside the chassis using non-metallic screwdrivers, modern radios like the AT-5555N II utilize digital potentiometers.

Verifies accurate transmission frequencies down to the single Hertz.

Provides a clean, controlled microvolt signal to calibrate the receiver S-meter. Best Practices for Service Menu Tuning

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