The AnyTone AT-5555N II is a powerful 10-meter radio, but its deepest configuration options are tucked away in a hidden service menu . While the standard background function menu
handles everyday settings like Roger Beep and Squelch levels, the service menu is where you perform critical alignments and adjust internal gain settings. How to Access the AT-5555N II Service Menu Accessing this menu requires a specific power-on sequence.
Always record your original values before making changes, as there is no "undo" button for these factory-level calibrations. Preparation : Turn the radio off. : Press and hold the buttons simultaneously.
: While holding these buttons, turn the radio on. All LCD segments will light up for roughly two seconds. Verification
: Within that 2-second window, release MENU and MODE, then quickly press these buttons in order: RB, NB, SCAN, MEM, EMG
: If successful, the radio will enter the Service Mode, often starting at a specific channel setting like CH-52 (RFG) Key Menu Settings & Operations
Once inside, you can navigate and adjust internal parameters: Navigation
: Rotate the channel switch or VFO knob to cycle through the menu items. Adjusting Values : To change a value, press and hold the PTT (Push-to-Talk) button while rotating the channel switch.
: Keying the mic allows you to check the current value for certain active settings. Common Settings CH-52 (RFG)
: Adjusts the RF Gain threshold. A common fix for high background noise (S5-S7) is tweaking this value (factory default is often around 86). Frequency Alignment : Includes settings like (BFO frequency), (local oscillator offset), and (fine-tuning limits). Google Groups Standard Menu vs. Service Menu For less intrusive changes, use the standard background menu by long-pressing the
key for 2 seconds while the radio is on. This allows for user-level adjustments like: device.report Beep/Roger Beep : Toggle sounds and frequency groups. : Total of 36 levels available. Mode Setup : Selecting between FM, AM, USB, LSB, and PA. device.report Anytone 5555n Ii Service Menu - Google Groups
Accessing the service menu on the AnyTone AT-5555N II allows for deep-level alignment and calibration, but it should be approached with caution as there is no "factory reset" for these specific internal settings. Entering the Service Menu
To enter the hidden service menu, use the following key sequence: Turn off the radio. Hold down the [FUNC] button and turn the radio on.
Immediately press the following buttons in sequence: [RB], then [NB], then [DW]. Service Menu Navigation
Scroll Settings: Press the [FUNC] button to cycle through the different alignment parameters.
Adjust Values: Use the channel selector knob to change the value of the selected setting.
Exit/Save: Turning the radio off usually saves the current settings, though it is highly recommended to record original values before making any changes. Common Service Menu Parameters
While documentation is sparse, users have identified several key settings typically found in this menu: bfC: Beat Frequency Oscillator (BFO) center adjustment.
fr0, fr4, fr5, fr9: Frequency alignment settings used for different modes (CW, USB, LSB) and specific offsets. loC: Local oscillator calibration. Important Precautions
No Global Reset: Standard CPU resets (holding [FUNC] + [SCAN] during power-on) only reset user-level menu settings and frequency ranges, not service menu calibrations.
Test Equipment Required: Proper alignment of these settings usually requires a signal generator, frequency counter, and an oscilloscope to ensure the radio remains on-frequency and within legal operating specs.
Individual Variations: Every radio is calibrated uniquely at the factory. Do not copy values from another radio, as this will likely result in poor performance or misalignment.
For those needing to recover a severely misaligned radio, some users suggest using PC-based alignment software (such as the AT-5555N II PC Program Software) which may allow for reading and saving calibration files.
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). anytone at-5555n ii service menu
: Controls the Local Oscillator offset. Experts recommend adjusting this
to get close to the target frequency before fine-tuning with fr0, fr4, fr5, fr9
: 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
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
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 features a powerful but undocumented Service Menu used for factory-level alignments, including power output limits and frequency fine-tuning. ⚠️ Critical Warning
No Factory Reset: There is no "reset" for this specific menu; changes are permanent unless manually reversed.
Documentation is Mandatory: You must write down every original value for all 50+ settings before making any adjustments.
Equipment Needed: Adjustments should only be made while the radio is connected to a dummy load or a properly tuned antenna. How to Access the Service Menu
There are two primary methods reported for entering the "Hidden" or Service Menu on the version II: The "Menu+Mode" Sequence: Start with the radio OFF.
Press and hold the [MENU] and [MODE] buttons simultaneously while turning the radio ON. Release the buttons once all LCD segments appear.
Immediately press the remaining buttons on the top row in order (starting with DW, then RB, NB, SCAN, MEM, and EMG). The "FUNC" Sequence: Hold [FUNC] while powering on. Then press [RB], then [NB], then [DW] in sequence.
If successful, the screen will display "FM" (Factory Menu) or a numbered setting. Navigation and Controls
Scroll Menu: Use the Channel Selector knob to move through the numbered settings (e.g., 01 to 59).
View Value: Key the PTT (Microphone Key) to see the current value of a selected item.
Modify Value: While holding the PTT, rotate the Channel Selector to change the numerical value. Save & Exit: Turn the radio OFF to save your new settings. Common Known Settings
While most of the 59+ settings are for internal alignment, users commonly use the following for performance tweaks: Common Usage / Tip 16 AM High Power Set the maximum "dead key" for AM high power. 17 AM Low Power
Used to lower AM dead key (e.g., to 2W) for driving external amplifiers. 19 / 20 Modulation
Controls AM modulation swing; some users report setting these to zero for higher "swing". 52 RF Gain (RFG) The AnyTone AT-5555N II is a powerful 10-meter
Adjusting this can sometimes help with the "receive noise" common on these units. bfC / loC Frequency Alignment
Used to calibrate the BFO and local oscillator if the radio is off-frequency. Anytone 5555n Ii Service Menu - Google Groups
To access the factory service (hidden) menu on the Anytone AT-5555N II, you must perform a specific button sequence during startup. This menu is used for internal hardware calibrations and should be used with extreme caution. Access Procedure Preparation: Ensure the radio is powered OFF.
Initial Hold: Press and hold the Menu and Mode buttons simultaneously.
Power On: While holding those buttons, turn the radio ON. All LCD segments will light up for approximately 2 seconds.
Sequential Entry: As soon as the display turns orange (within that 2-second window), release the Menu and Mode buttons and quickly press the following buttons in exact order: DW → RB → NB → SCAN → MEM → EMG
Confirmation: If successful, the screen will display "FM" (for Factory Menu) instead of an "ERROR" message. Navigating & Saving Settings
Scroll: Rotate the Channel Selector knob to move through the service menu items.
Adjust: To change a value, press and hold the PTT (key the mic) while rotating the Channel Selector knob.
Save: Release the PTT to save the new value for that specific menu item. Exit: Turn the radio OFF to exit the service mode. Key Service Menu Items Setting Name CH-17 AMPOWL
Sets the low power dead key (typically adjusted to 1-2 watts). CH-52 RFG RF Gain calibration; default value is usually around 86. bfC BFO Adjustment Adjusts the 10.24MHz BFO frequency. loC LO Offset
Controls the local oscillator offset for frequency centering.
Important Warning: Never change these settings without professional test equipment (frequency counters, signal generators). Improper adjustments can "unalign" the radio's transmission and reception across different modes. Always write down original factory values before making any changes.
What are the hidden menu settings on the AnyTone AT5555N 2 radio?
Accessing and Navigating the Service Menu of the AnyTone AT-5555N II: A Comprehensive Guide
The AnyTone AT-5555N II is a versatile and feature-rich two-way radio that offers a wide range of functionalities for both amateur and professional users. One of its advanced features is the service menu, which allows users to access and modify various settings and parameters that are not available through the standard user interface. This essay aims to provide a detailed overview of how to access and navigate the service menu of the AnyTone AT-5555N II, as well as to discuss the implications and potential uses of this feature.
Accessing the Service Menu
To access the service menu on the AnyTone AT-5555N II, users must follow a specific sequence of steps. First, ensure that the radio is powered off. Then, press and hold the "Monitor" button while turning the radio on. Continue holding the "Monitor" button until the radio enters the service menu mode. This may take a few seconds. Once in the service menu, users can navigate through the various options using the radio's control buttons.
Navigating the Service Menu
The service menu of the AnyTone AT-5555N II is divided into several sub-menus, each containing a range of adjustable parameters. These parameters can include settings for transmitter power, frequency deviation, squelch sensitivity, and more. It is crucial for users to exercise caution when making changes in the service menu, as incorrect settings can potentially render the radio inoperable or cause it to malfunction.
Implications and Potential Uses
The service menu of the AnyTone AT-5555N II offers advanced users and technicians the ability to customize and fine-tune the performance of their radio. For instance, adjusting the transmitter power can be useful in optimizing the radio's range and signal quality in different operational environments. Similarly, tweaking the squelch settings can help in reducing background noise and interference, thereby improving the overall communication clarity.
However, accessing and modifying settings in the service menu also carries risks. Unauthorized or improper changes can lead to compliance issues with regulatory standards, void warranties, or even damage the radio. Therefore, it is recommended that only experienced users or certified technicians attempt to access and modify the service menu settings.
Conclusion
The service menu of the AnyTone AT-5555N II is a powerful tool that offers advanced customization options for users who wish to optimize the performance of their radio. While it presents opportunities for enhancing the device's functionality and efficiency, it also requires a careful and informed approach to avoid potential pitfalls. By understanding how to safely access and navigate the service menu, users can unlock the full potential of their AnyTone AT-5555N II, ensuring reliable and high-quality communication. Frequency accuracy (The displayed frequency vs
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.
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.
Before we type a single button combination, it is crucial to understand why this menu exists. The AT-5555N II is a precision analog/digital hybrid radio. Over time, temperature changes, component aging, or minor manufacturing tolerances can cause deviations in:
The service menu allows a technician to digitally trim these values without soldering iron or variable capacitors (trimmers). It is not intended for daily driver adjustments to "squeeze more power" out of the radio.
Note: exact key sequence may vary by firmware version. If these don’t work, consult the official service manual or firmware release notes.
(If the unit uses a different button combo, try [MENU] + [#] on power-up; stop if the screen freezes or the radio behaves oddly.)
I’ve used the service menu on my AT-5555N II to gently bring my AM carrier down to 4W (for driving an amp) and to calibrate the frequency drift after warm-up. It’s a powerful tool, but treat it like surgery—make small changes, test, and always document your original settings.
Have you been inside your AT-5555N II’s service menu? Share your experience below (without breaking FCC rules, of course).
73 and happy tuning.
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.