Anytone At-5555n Ii Service Menu -
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.
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.
Accessing the service menu on the AnyTone AT-5555N II requires holding the MENU and MODE buttons while powering on, followed by pressing the top row of buttons from DW to EMG. Because these settings control internal calibration and lack a factory reset option, users are advised to record all original values before making adjustments. Read more at WorldwideDX Radio Forum.
Anytone at-5555n II (version 2) | Page 39 - WorldwideDX Radio Forum
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.
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 anytone at-5555n ii service menu
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.
Unlocking the Full Potential of Your Anytone AT-5555N II: A Comprehensive Guide to the Service Menu
The Anytone AT-5555N II is a popular and highly-regarded ham radio transceiver that offers a wide range of features and capabilities. However, to truly unlock its full potential, you need to access the service menu. In this article, we'll provide a comprehensive guide on how to access and navigate the Anytone AT-5555N II service menu, as well as explore the various settings and options available.
What is the Service Menu?
The service menu, also known as the "service mode" or "engineering mode," is a hidden menu on the Anytone AT-5555N II that allows users to access and adjust various technical settings and parameters. These settings can help optimize the performance of the radio, troubleshoot issues, and even add new features.
Why Access the Service Menu?
There are several reasons why you might want to access the service menu on your Anytone AT-5555N II:
How to Access the Service Menu
Accessing the service menu on the Anytone AT-5555N II requires a specific sequence of steps:
Navigating the Service Menu
The service menu on the Anytone AT-5555N II is divided into several sections, including:
Common Service Menu Settings and Options
Here are some common settings and options you may find in the service menu:
Important Safety Precautions
When accessing and adjusting settings in the service menu, it's essential to exercise caution and follow proper safety procedures: The service menu (sometimes called a hidden or
Conclusion
The Anytone AT-5555N II service menu provides a wealth of options and settings that can help you optimize the performance of your radio, troubleshoot issues, and add new features. By following the steps outlined in this article, you can access and navigate the service menu with confidence. However, always exercise caution and follow proper safety procedures to avoid causing damage or affecting the performance of your radio. Happy operating!
Additional Tips and Tricks
FAQs
References
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
: 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
The Anytone AT-5555N II service menu allows for deep internal alignment and calibration. Because there is no factory reset for these settings, it is vital to record every original value before making changes. 🛠️ Accessing the Service Menu To enter the service menu, follow these steps exactly: Ensure the radio is OFF.
Press and hold the MENU and MODE buttons simultaneously while turning the power ON.
All LCD segments will illuminate for approximately 2 seconds.
Within those 2 seconds, release the buttons and immediately press the following buttons in sequence: RB, NB, SCAN, MEM, EMG.
Alternative method: Some versions require holding FUNC while powering on, then pressing the other buttons in the top row (DW to EMG) in order. ⚙️ Navigation and Controls
Scrolling: Use the Channel Selector or VFO knob to cycle through the menu items (there are typically around 53 parameters). 73 and happy tuning
Viewing Values: To see the current numerical value of a setting, press the PTT (key the mic).
Changing Values: Hold the PTT and rotate the Channel Selector or VFO knob to adjust the value up or down.
Saving/Exiting: Power cycle the radio (turn it off and back on) to save settings. 📝 Common Service Menu Parameters
While documentation is limited, users have identified several key settings: CH-52 RFG
Often used to reduce high background noise (S5-S7) present on some units. bfC, fr0-fr9 Frequency Alignment
Used to calibrate the carrier frequency for different modes (USB, LSB, CW). AM Modulation AMC / Modulation
Adjusts the clamping level; smaller values typically equal higher modulation. ⚠️ Critical Warnings
No Factory Reset: Performing a standard CPU reset (FUNC + SCAN at power on) will not restore service menu values to factory defaults.
Record Everything: Always write down every value for all 50+ menu items before changing anything. If you lose your original settings without a backup, the radio may require professional realignment with a signal generator.
Equipment Required: Many frequency-related settings (like fr0) should only be adjusted while using a high-precision frequency counter or signal generator. Anytone 5555n Ii Service Menu - Google Groups
It’s surprisingly simple, but the key combination isn’t in the user manual.
You should now see a new menu labeled S-XXXX or similar engineering screens instead of the normal channel frequency.
Legal warning: Check your local license limits. In the US, CB is limited to 4W AM / 12W PEP SSB.
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.
The AT-5555N II is sold as a 10m/12m amateur radio. The service menu does not add 11m (CB) frequencies—that is controlled by a separate jumper or firmware region lock. The service menu is for calibration only, not band expansion.
The AnyTone AT-5555N II has cemented its reputation as a powerhouse in the CB and 10-meter amateur radio community. Known for its robust build, excellent receiver sensitivity, and impressive power output straight out of the box, it is a favorite for DX enthusiasts and local communicators alike.
However, beneath the surface of its user-friendly LCD display and multi-function buttons lies a hidden layer of calibration: The Service Menu.
For the average user, the standard menu suffices. But for the technician, the power user, or the owner trying to restore a drifted unit to factory specs, the Service Menu is the Holy Grail. This article provides a complete, technical walkthrough of the AnyTone AT-5555N II service menu, including access codes, navigation, adjustable parameters, and critical safety warnings.