Anytone At-5555n Ii Service Menu (UHD 2027)

The service menu (sometimes called a hidden or engineering menu) provides low-level configuration and calibration options beyond the standard user programming screens. It’s used for manufacturing calibration, repairs, hardware diagnostics, and advanced feature enabling/disabling. Accessing it can change radio behavior in ways that affect safety, compliance, or legal operation.

The AnyTone AT-5555N II has earned a stellar reputation in the CB and 10-meter amateur radio world. With its rugged build, crisp multi-color display, and powerful output, it’s a favorite for DX hunters and local talkers alike. But beneath the user-friendly interface lies a hidden layer of calibration and diagnostics: the Service Menu.

For most users, the stock settings work fine. But for the tinkerer, the technician, or the power user chasing every last dB of performance, the Service Menu is a gateway to fine-tuning the radio’s soul.

Many owners notice slight frequency offset on SSB. By monitoring a known frequency standard (e.g., WWV at 10 MHz), you can trim the rEF setting until zero-beat. This makes you sound crystal clear on sideband.

Once in the service menu, navigation is generally straightforward:

Do not trust online "mod" videos blindly.

Many YouTube influencers will tell you to max out every value (PWR HI = 255, MOD AM = 255). This is reckless. The digital settings correspond to analog voltages. Setting "255" on a parameter that expects a sine wave output will result in a square wave—burning your finals instantly. anytone at-5555n ii service menu

Furthermore, the Service Menu does not lock out illegal frequencies. While the AT-5555N II is primarily a 10m/12m radio, misuse in CB bands (27 MHz) with excessive power is illegal and disrespectful to other band users.

Most stable method:

Do not simply switch off the main DC supply while inside the menu; allow the microcontroller to close its write-protect routines.

If the button combination fails:

A. Adjusting RF Power (PO)

B. Frequency Expansion (Unlocking) If the radio is restricted to the standard 11m band (CB): The service menu (sometimes called a hidden or

C. Frequency Calibration (TCXO) If your radio is slightly off-frequency (people tell you you sound "bassy" or "muffled" on SSB):

To access the service menu on the AnyTone AT-5555N II, you must perform a specific sequence of button presses during power-on. This "hidden" menu is primarily used for alignment, such as fine-tuning the frequency or adjusting the Local Oscillator (LO) Google Groups Accessing the Service Menu the radio. Press and hold the button while turning the radio Immediately release and then press the next three buttons in quick succession:

The display should now show service parameters, typically starting with (BFO adjustment) followed by a 3-digit value. Google Groups Navigation and Key Parameters Navigation button to scroll through different settings. Mode-Specific Settings

: Alignment settings may differ depending on your current mode (AM, FM, USB, LSB, CW). Common Parameters : Adjusts the 10.24MHz Beat Frequency Oscillator (BFO).

: Controls the Local Oscillator offset. Experts recommend adjusting this

to get close to the target frequency before fine-tuning with fr0, fr4, fr5, fr9 Do not trust online "mod" videos blindly

: Used for fine-tuning specific frequency points (e.g., .00, .04, .05, .09 offsets) by adjusting varicap voltage. Google Groups Factory Reset & Band Expansion Full Reset : If needed, turn the radio on while holding until "RES" then "REND" appears. Frequency Expansion

: To unlock the radio (e.g., for 11m/CB bands), turn on while holding , then switch from using the channel knob and press to confirm. Google Groups

: Changing values in the service menu without proper test equipment (like a frequency counter or signal generator) can significantly degrade the radio's performance or cause it to operate off-frequency. Google Groups alignment values for SSB or CW modes to help center your frequency? Anytone 5555n Ii Service Menu - Google Groups

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.