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The service menu is a powerful, hidden feature set used primarily for internal alignment, power adjustments, and signal fine-tuning. Unlike the standard user menu, this interface contains roughly 59 individual settings that directly control the radio's hardware parameters. Accessing it requires a precise power-on sequence and specific button combinations. How to Access the Anytone AT-5555N II Service Menu
: Controls the default RF Gain level. Some users adjust this (often set to ~86) to reduce high background floor noise.
This article explains everything you need to know about the , including how to access it, navigate the parameters, and perform common calibrations.