Anytone At5555n — Ii Service Menu Updated High Quality

The service menu on the AnyTone AT-5555N II contains critical alignment parameters that are not documented in the standard Instruction Manual. Crucially, there is no "factory reset" for this menu, so you must record your original values before making any changes. Accessing the Service Menu

To enter the hidden service menu, follow these steps precisely: Preparation: Ensure the radio is powered off.

Power On sequence: Press and hold the [MENU] and [MODE] buttons simultaneously while turning the radio on.

Code Entry: All LCD segments will illuminate for approximately 2 seconds. Within this window, release the buttons and immediately press the top-row keys in this specific order: [RB], [NB], [SCAN], [MEM], then [EMG].

Confirmation: The radio will enter the Service Mode, often defaulting to a specific channel setting (e.g., CH-01). Operating the Service Menu anytone at5555n ii service menu updated

Navigation: Rotate the [Channel] knob to scroll through the different menu items (there are approximately 59 settings).

Viewing Data: Key the microphone (PTT) to view the current value of a selected menu item.

Adjusting Values: While holding the PTT, rotate the [Channel] knob to increase or decrease the value.

Saving and Exiting: Power the radio off and then back on to store the new values. Common Service Menu Parameters The service menu on the AnyTone AT-5555N II

While most of the 59 items are used for factory alignment, users frequently access specific settings for performance tweaks:

CH-52 (RFG): Adjusts the RF Gain threshold. Increasing this value (e.g., from a default of 86 to around 105) can help reduce background static and "S7 noise" on newer units.

Frequency Alignment: Includes settings such as bfC (BFO frequency adjustment) and loC (Local Oscillator offset) for fine-tuning SSB operation.

Modulation: Includes parameters for AM modulation and AMC clamping levels; lower values typically equate to higher modulation. Summary of Hidden Menus Access Method Common Purpose Standard Menu Long press [MENU] User settings (BEEP, ECHO, TOT, etc.) Expansion Menu Hold [FUNC] + [SCAN] at power-on Resetting frequency ranges (e.g., 25.615–30.105 MHz) Service Menu [MENU]+[MODE] at power-on, then [RB, NB, SCAN, MEM, EMG] Technical alignment (RF Gain, BFO, Modulation) Navigating the Updated Menu Structure Unlike the old

Are you looking to fix a specific performance issue, such as high background noise or frequency drift? Anytone at-5555n II (version 2) - WorldwideDX Radio Forum

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Navigating the Updated Menu Structure

Unlike the old menu which used cryptic numbers, the updated AT5555N II uses a hybrid system of Parameter Numbers (P-xx) and Value fields.

• Channel Knob: Scrolls through the parameter numbers (P-01, P-02, etc.).
• Function (FUNC) + Channel Knob: Adjusts the value of the selected parameter.
• Band Button: Saves the setting and moves to the next parameter.
• Power Button: Exits the service menu (saves on exit).

What’s New in the Updated Menu?

Veteran users will notice a few differences in the latest service menu revision:

• More PLL Parameters: You now have finer control over the Phase Locked Loop, allowing for tighter frequency stability in extreme temperatures.
• Expanded TX Range: While safety is key, the updated menu allows for a wider experimental frequency range (use within your license limits!).
• Live Bar Graphs: Instead of just numbers, certain adjustments (like RF gain) now display a small live bar graph, making alignment much easier.
• Save Confirmation: The radio now asks "Save? Y/N" before exiting, preventing accidental changes.

Common Service Menu Items (updated)

• TX Power Calibration: Adjusts transmitted output power. Use a calibrated power meter.
• RX Sensitivity: Fine-tunes receiver gain; lowering noise floor or fixing weak reception.
• Frequency Offset / PLL Settings: Corrects transmit/receive frequency alignment. Use a frequency counter.
• Squelch Threshold: Sets squelch behavior for muting background noise.
• CPU/Bootloader Version: Shows firmware versions — useful before firmware updates.
• Keypad/Display Timeout: Change timeouts for power saving or convenience.
• Battery Charging Parameters: Limits for charging current/voltage—don't exceed safe values for your battery.
• Audio De-emphasis / Mic Gain: Adjust transmit audio levels and tone. Use a service monitor or check over-the-air audio quality.
• Fan / Thermal Limits (if present): Temperature thresholds for thermal protection.
• Memory Reset / Factory Defaults: Reverts settings; use only if needed.