Anytone At-5555n Ii Service Menu Link

This digest explains the AT-5555N II service menu: what it is, what you can access, common settings technicians change, safe procedures, and troubleshooting notes. It's written for radio users and technicians who want a focused reference without having to dig through full manuals.

The Service Menu contains parameters essential for the functionality of the Phase Locked Loop (PLL) and the RF Power Amplifier. The exact numbering may vary by firmware version, but the functions remain consistent.

The method differs slightly depending on the specific firmware version of your radio, but the following method is standard for the N-II series:

Method A (Standard):

Method B (Alternative - if A fails):

  • RF Calibration / TX Power
  • Frequency & PLL
  • Audio
  • Keypad & Display
  • Diagnostics & Tests
  • Channel/Memory Overrides
  • Security/Lock
  • Misc

    • The AnyTone AT-5555N II is a fantastic radio right out of the box. The Service Menu isn’t for casual users—but for those with the skills and tools, it transforms a great radio into a finely tuned machine. Treat it with respect, and it will reward you with unmatched performance on 11m and 10m bands.

    Pro tip: If you’re unsure, find a local ham with an RF lab. One hour of guided calibration beats weeks of chasing mysterious problems.

    Have you accessed the Service Menu on your AT-5555N II? Share your experiences (and warnings) in the comments.

    Anytone AT-5555N II Go to product viewer dialog for this item.

    , like many advanced radio transceivers, contains a service menu used for factory alignment and calibration. This menu is intended for use by qualified technicians using specialized test equipment such as frequency counters, power meters, and signal generators. Understanding the Service Menu

    The service menu allows for the adjustment of internal parameters that are not accessible through the standard user menu. These settings typically include:

    Frequency Calibration: Aligning the reference oscillator to ensure the radio transmits and receives on the correct frequency. anytone at-5555n ii service menu

    Power Levels: Setting the minimum and maximum output power for different modes (AM, FM, SSB).

    Modulation Settings: Adjusting the modulation gain to ensure clear audio transmission within legal bandwidth limits.

    S-Meter Calibration: Tuning the signal strength indicator for accuracy. Important Considerations

    No Factory Reset: Most service menus do not have a "reset to default" option. Changes made are written directly to the EEPROM. If the original values are not recorded before adjustment, it can be very difficult to restore the radio to its factory state.

    Regulatory Compliance: Transmitters are calibrated to meet specific legal requirements regarding frequency stability and bandwidth. Improper adjustments can cause the radio to operate outside of legal specifications, potentially causing interference with other services.

    Hardware Risks: Making incorrect adjustments to power stages or bias settings can lead to overheating and permanent hardware failure. Recommended Best Practices

    For those looking to optimize or repair a radio, it is recommended to:

    Consult the Official Service Manual: The manufacturer's service manual provides the exact procedures and required test conditions for alignment.

    Use a Dummy Load: Any testing involving transmission should be done into a dummy load to prevent unnecessary interference and protect the final transistors.

    Seek Professional Service: If a radio is off-frequency or underperforming, a professional radio shop with the correct calibration tools can ensure the device is set to peak performance safely and legally.

    To access the service menu on the Anytone AT-5555N II , use the following key sequence: the radio. Hold down the buttons simultaneously and turn the radio two seconds This digest explains the AT-5555N II service menu:

    of powering on, release those buttons and quickly press the following sequence in order: (Roger Beep) (Noise Blanker) (Emergency) Important Considerations Calibration Settings

    : The service menu contains alignment settings specific to your individual unit. Write down all original values

    before making any changes. Improper adjustments can cause permanent frequency drift or hardware issues. RF Gain Fix

    : A common use for this menu is to address high "noise floor" readings (where the S-meter shows S5–S7 with no signal). Changing CH-52 (RFG) from its default (often ~86) to a higher value like has been reported to resolve this. Adjustment Method : To change a value, press and hold the PTT button while rotating the Factory Reset

    : If the radio becomes unstable, you can perform a full reset by holding while powering on. Google Groups frequency alignment procedures for CW, USB, and LSB modes using this menu?

    The AnyTone AT-5555N II Go to product viewer dialog for this item.

    is a sophisticated, software-controlled 10-meter radio that relies on a "hidden" Service Menu for fine-tuning its internal parameters. Unlike older radios with physical potentiometers (pots), most adjustments for power output, modulation, and frequency alignment are handled through these digital menus. Accessing the AT-5555N II Service Menu

    To enter the service menu, follow this specific power-on sequence:

    Preparation: Ensure the radio is connected to a dummy load or a well-tuned antenna before making any changes.

    Initial Key Combo: With the radio off, press and hold both the MENU and MODE buttons simultaneously while turning the power on.

    Validation: All LCD segments will light up for roughly two seconds. During this brief window, release the MENU and MODE buttons. Method B (Alternative - if A fails):

    Security Sequence: Quickly press the following buttons in exact order: RB, NB, SCAN, MEM, and EMG.

    Note: Some versions may require a simpler sequence: hold MENU and MODE, power on, then press each button moving down the line starting with DW.

    Confirmation: The screen should display "FM" (Factory Menu), indicating you have successfully entered the service mode. Essential Service Menu Settings

    Once inside, you can navigate settings using the Channel Selector knob. To view or change a value, press and hold the PTT (microphone key) while rotating the Channel Selector. Function & Recommended Usage Ch 16 AMHI

    AM High Power: Adjusts the maximum "dead key" power for AM mode. Ch 17 AMPOWL

    AM Low Power: Typically used to set the low power dead key to 1–2 watts for use with amplifiers. Ch 19 & 20 MOD

    AM Modulation: Controls the modulation swing. Lowering these values often increases modulation. Ch 52 RFG

    RF Gain: Calibrates the receiver's gain floor. The factory default is typically around 86. bfC BFO

    Beat Frequency Oscillator: Adjusts the frequency for CW, USB, and LSB modes. loC LO

    Local Oscillator: Controls the frequency offset. Adjust this first if the radio is off-frequency across all modes. Critical Safety Rules

    Write Everything Down: Before changing any value, record the original factory setting for all 53+ items. There is no master reset that restores these individual calibration values once changed.

    Dummy Load Required: Transmitting into an open circuit while adjusting power settings can permanently damage the radio's finals.

    Incremental Adjustments: For modulation and power, change values in small steps and verify with an external wattmeter or oscilloscope.