If the radio displays "------" or random numbers, the PLL has lost lock.
Yes, but only if you have a calibrated external frequency counter and a dummy load. The updated service menu on the AT-5555N II is a massive improvement over the older, clunkier interfaces. It turns a great production radio into a precision instrument.
If you just bought the radio and it works fine—leave the menu alone. But if you are a seasoned tech looking to squeeze every drop of performance out of your 5555N II, the updated service menu is your new best friend.
Have you found any new hidden parameters in the latest firmware? Let us know in the comments below!
Stay tuned for more CB and amateur radio tips. Until then, keep the mic warm and the SWR low.
The AnyTone AT-5555N II (Version 2) features a revised internal service menu compared to the original AT-5555N, with recent updates (specifically the v3 firmware released around late 2024) introducing more granular control over modulation and noise reduction [10, 13]. Accessing the Service Menu To enter the hardware service menu on the AT-5555N II: Turn the radio OFF. Press and hold the FUNC and SCAN buttons simultaneously. Turn the radio ON while continuing to hold the buttons.
The display will enter the service mode, allowing you to scroll through settings using the channel selector [6, 8, 10]. Key Service Menu Settings
Recent user findings and firmware updates identify several specific parameters used for fine-tuning performance [6, 10]: Setting Adjustment Tips bfC BFO Frequency
Adjusts the 10.24MHz Beat Frequency Oscillator. Critical for clearing up garbled SSB reception [6]. fr0 - fr9 Fine Tuning Limits
Controls voltage across varicaps for precise frequency steps (.00, .04, .05, .09). Align these after any BFO change [6]. loC Local Oscillator Offset
Used to align the radio if it is consistently "off" across all modes. Change this before bfC [6]. Modulation TX Audio
Updated v3 firmware includes better "deviation" control to prevent over-modulation in FM/AM modes [10]. Software-Based Alignment
A new PC Alignment Software (v1.03) has been released that supports the AT-5555N II [13].
Purpose: Allows for reading, saving, and restoring factory alignment settings.
Requirements: Needs the standard programming cable (CH341SER or PL-2303) and Firmware V1.01 or newer [13, 14].
Warning: Alignment files are unique to each unit. Do not upload an alignment file from one radio to another as it will cause incorrect calibration [13]. Notable Hardware Improvements (N II Version)
The AT-5555N II is frequently compared to the Stryker 955 v2 due to shared internal architecture but includes several proprietary AnyTone features [5, 9]:
Noise Reduction: Integrated TX and RX digital noise reduction (NRC) which is widely praised for cleaning up static on the 11m/10m bands [1, 9]. Power Output: Capable of 60W PEP in export mode [7, 10].
Modifications: The "expansion" to the 11-meter (CB) band is typically handled via a button combination (hold FUNC + EMG while powering on) rather than physical wire cutting on newer boards [5, 12].
Important Safety Note: Adjusting service menu parameters without a signal generator and frequency counter can permanently degrade radio performance. Always record your original factory values before making changes [13].
The AnyTone AT-5555N II service menu (updated v3 and v2) is a hidden "Factory Menu" used for internal hardware alignment and calibration. Unlike the standard background function menu, this menu directly adjusts hardware parameters like power output and modulation levels. ⚠️ Critical Safety Warning
Write down every original value before making changes. There is no master reset for the service menu, and settings are unique to every individual radio based on factory calibration. Accessing the Service Menu To enter the hidden service menu on the AT-5555N II: Ensure the radio is OFF. Press and hold the MENU and MODE buttons simultaneously. While holding these, turn the radio ON.
Immediately after power-up, release them and press the remaining six buttons on the top row in order (starting from DW and moving toward EMG). The screen should display "FM" (Factory Menu). Common Service Menu Adjustments
The menu contains approximately 53 parameters. Common points of interest include:
Modulation Settings (#19 & #20): Used to adjust AM modulation swing. Some users report that setting these to zero improves "swing".
AM Power (#16 & #17): Controls High and Low dead-key power settings for AM mode.
Alignment (fr0, fr4, fr5, fr9): These are used for fine-tuning frequencies across different varicap limit voltages. anytone at5555n ii service menu updated
BFO/LO Calibration (bfC, loC): Adjusts the 10.24MHz Beat Frequency Oscillator and Local Oscillator offsets to center RX/TX. Navigation and Controls
Scrolling: Use the Channel Selector knob to move through numbered menu items.
Viewing Values: Key the microphone (PTT) to see the current value of a selected item.
Changing Values: Hold the PTT key and rotate the Channel Selector knob to increase or decrease values.
Saving/Exiting: Power cycle the radio (turn off and on) once adjustments are complete. Standard Background Menu (Non-Hidden)
For standard feature adjustments (e.g., mic gain, SWR protection, NR settings), use the standard background menu: Press and hold MENU for 2 seconds while the radio is ON. Use the Channel Switch to select an item.
Press the PUSH knob to enter the setup and rotate to change settings.
Are you looking to calibrate a specific mode like SSB frequency centering or are you aiming to increase AM modulation swing? Anytone 5555n Ii Service Menu - Google Groups
In the world of amateur radio, the Anytone AT-5555N II is a powerhouse, but for those who want to truly master their gear, the standard settings are just the beginning. This story follows a hobbyist's journey into the updated "Hidden" Service Menu—a place where the radio’s deepest secrets are kept. The Legend of the Hidden Menu
For years, the AT-5555 series was known for its reliability on 10 and 11 meters, but the "N II" version brought a more complex digital architecture. One rainy evening, a radio operator named Elias decided to address a nagging issue: his SSB receive quality was slightly "wonky," and his fine-tuning felt stepped rather than smooth. He knew a simple factory reset (holding FUNC + SCAN
while powering on) wouldn't fix the underlying alignment. He needed the Service Menu The Ritual of Access
To enter this restricted space, Elias performed the precise sequence required for the newer firmware: He turned the radio off. He held down the button while powering it back on. Once the screen lit up, he quickly pressed
The display transformed. Instead of channel numbers, cryptic codes like appeared. He was "inside." Tweaking the Soul of the Radio
Elias spent the next hour carefully navigating these updated parameters: : He used this to adjust the frequency of the 10.24MHz BFO
. A slight tweak here brought the SSB clarity back to life, removing the "tinny" sound from distant voices. fr0 to fr9
: These were the limit voltages for fine-tuning. By adjusting these, he ensured that his tuning remained even and smooth across the entire frequency range.
: This controlled the local oscillator offset. Elias learned to adjust this first to get close to the target frequency before fine-tuning with the Modulation (IC9) : He navigated to the
setting to boost his audio modulation. Finding it at the default of 31, he increased it toward 63, ensuring his voice would punch through the noise on skip. The Aftermath
With the adjustments made, he saved his settings and exited the menu. The radio felt reborn—his transmit was stronger, his receive was crystal clear on LSB and USB, and his frequency was dead-on.
However, Elias left with a word of caution for others: these settings are unique to every individual radio's hardware. Changing them without a frequency counter or signal generator is like "tuning a piano in the dark"—once you lose the factory alignment, it’s hard to find your way back. exact technical steps
to perform a specific adjustment, such as opening the bands or boosting your modulation? Anytone 5555n Ii Service Menu - Google Groups
The AnyTone AT-5555N II is a high-performance 10-meter radio, but many of its most critical calibration settings—like power output and modulation—are tucked away in a hidden Service Menu. Because there is no factory "reset" for this specific menu, users must exercise extreme caution when making adjustments. How to Access the Hidden Service Menu
Accessing the service mode requires a specific sequence of button presses during the power-on cycle.
Preparation: Ensure the radio is connected to a dummy load or an antenna to prevent damage.
Initial Combo: With the radio OFF, press and hold both the [MENU] and [MODE] buttons. Power On: While holding those buttons, turn the radio on.
Secondary Sequence: Once the radio powers up, release the initial buttons and immediately press the following top-row buttons in order: [DW], [RB], [NB], [SCAN], [MEM], and [EMG]. If the radio displays "------" or random numbers,
Entry Confirmation: If successful, the display should show "FM" (representing the factory menu) or a numerical setting. Navigating and Saving Settings
Scrolling: Use the Channel Selector knob to cycle through different menu items (ranging from 1 to over 50).
Viewing Values: To see the current value of a setting, press the PTT (Push-To-Talk) button on the microphone.
Changing Values: To modify a value, hold the PTT while rotating the Channel Selector. Saving: Turn the radio off to save your changes.
CRITICAL WARNING: Always WRITE DOWN every original value before changing it. There is no software reset for these specific alignment values; if you change them without a backup, you cannot easily restore factory calibration. Key Service Menu Items and Fixes
While the radio lacks official documentation for every item, community testing has identified several critical settings for the AT-5555N II: Description #16 AM High Power Adjusts the peak dead key for AM high power mode. #17 AM Low Power
Adjusts the low power dead key (often set to 2 watts for amp driving). #19 & #20 Modulation Some users set these to "0" to improve AM modulation swing. #52 (RFG) RF Gain Fix
Used to resolve "S5-S7 noise" issues. Increasing this value (e.g., from 86 to 105) can quiet a noisy receiver. Frequency Expansion (Export Mode)
If you are looking to unlock the full 11-meter and 12-meter bands (25.615 to 30.105 MHz), follow this separate procedure: Turn the radio OFF. Hold [FUNC] and [EMG] and turn the radio ON. Rotate the channel knob to select "BAND 2". Long-press [FUNC] until the display shows "rEND". Power cycle the radio.
Unlocking the Full Potential of the Anytone AT5555N II: A Guide to the Updated Service Menu
The Anytone AT5555N II is a popular and highly-regarded ham radio transceiver that has been a favorite among amateur radio enthusiasts for years. Known for its robust feature set, excellent performance, and durability, the AT5555N II has become a staple in many ham radio operators' arsenals. However, to truly unlock the full potential of this remarkable radio, users need to access the service menu, and in this article, we'll explore the updated service menu for the Anytone AT5555N II.
What is the Service Menu?
For those who may not be familiar, the service menu is a hidden menu in the Anytone AT5555N II that allows users to access advanced settings and configurations. This menu is not part of the standard user interface and is typically used by service technicians and advanced users to calibrate, configure, and troubleshoot the radio. The service menu provides access to a wide range of parameters, including frequency calibration, transmitter adjustment, and receiver settings, among others.
Why is the Service Menu Important?
The service menu is essential for several reasons:
The Updated Service Menu for the Anytone AT5555N II
Recently, an updated service menu for the Anytone AT5555N II has become available, offering a range of new features, improvements, and enhancements. This updated menu is designed to provide users with even more flexibility and control over their radio, allowing them to optimize its performance and take advantage of new capabilities.
Key Features of the Updated Service Menu
Some of the key features of the updated service menu for the Anytone AT5555N II include:
How to Access the Updated Service Menu
Accessing the updated service menu for the Anytone AT5555N II requires a few specific steps:
Important Safety Precautions
When accessing and adjusting the service menu, it's essential to exercise caution and follow proper safety procedures:
Conclusion
The updated service menu for the Anytone AT5555N II offers a wealth of new features, improvements, and enhancements that can help users unlock the full potential of their radio. By accessing and adjusting various parameters, users can optimize their radio's performance, troubleshoot issues, and take advantage of new capabilities. However, it's essential to exercise caution and follow proper safety procedures when working with the service menu. With this guide, you'll be well on your way to becoming an expert in using the updated service menu for the Anytone AT5555N II.
Additional Resources
For more information on the Anytone AT5555N II and its service menu, we recommend the following resources:
By exploring these resources and taking the time to learn about the updated service menu, you'll be able to get the most out of your Anytone AT5555N II and enjoy a more rewarding ham radio experience.
Accessing the service menu on the AnyTone AT-5555N II allows you to adjust internal alignment settings like modulation, RF gain, and frequency fine-tuning.
⚠️ WARNING: Record all current values before changing anything. There is no "factory reset" for these specific service parameters. 🛠️ Access the Service Menu Power Off the radio.
Press and hold the [MENU] and [MODE] buttons simultaneously. Power On the radio while holding these buttons.
Within 2 seconds, release them and quickly press the top row of 6 buttons in order from left to right: [DW], [RB], [NB], [SCAN], [MEM], and [EMG].
The radio will enter Service Mode, typically starting at menu item 01. ⚙️ Key Settings & Controls
Navigation: Use the Channel Selector knob to scroll through the 50+ menu items.
View Data: Momentarily key the PTT (microphone) to see the current value of a setting.
Change Data: While holding the PTT, rotate the Channel Selector knob to adjust the value.
Save/Exit: Power the radio off and back on to save your changes. Common Menu Items
CH-52 (RFG): Adjusts the RF Gain floor. Useful if you have high background noise (S5-S7) with no signal; increasing this value (e.g., from 86 to 105) can quiet the receiver.
Modulation: Lower values on AM modulation settings typically result in higher modulation (less clamping).
Alignment: Settings like bfC and fr0–fr9 control the BFO and fine-tuning voltages for different modes. 🔓 Frequency Expansion (11m Mode)
If you need to switch between the 10m amateur band and the expanded 11m band: Power Off the radio. Hold [FUNC] and [EMG] while powering on.
Turn the channel knob to select BAND 2 (expanded) or BAND 1 (10m).
Press [FUNC] to confirm; the screen will show rES then rEND.
For advanced PC-based adjustments, ensure you have the correct programming cable and software specifically for the "N II" version.
Note: These addresses are for the N II model only, not the original 5555N.
| Parameter | Function | Typical Value (AM) | Note | | :--- | :--- | :--- | :--- | | P-07 | AM Carrier Power | 25-35 | Lower for amps | | P-09 | SSB ALC Max | 85-95 | Don't max this out | | P-14 | Frequency Fine Tune | 500-520 | Center = 512 | | P-22 | S-Meter Zero (Squelch) | 15-25 | Adjust until S-meter reads 0 | | P-41 | TX Audio Limiter | 60-80 | Higher = Louder |
Disclaimer: These are starting points. Every radio is different due to component tolerances.
If you own an Anytone AT-5555N II, you already know you’re holding one of the most powerful and feature-packed 10-meter (and multi-band) mobile radios on the market. With its dual-core processor, massive color display, and impressive sensitivity, it’s a favorite for DXers and local talkers alike.
But hidden beneath that glossy interface lies a secret weapon: The Service Menu.
For years, the "secret menu" has been a topic of hushed tones on forums. Recently, updated methods and expanded parameters have surfaced, giving operators more control than ever before. Here is everything you need to know about the updated Service Menu for the AT-5555N II.
Unlike the old menu which used cryptic numbers, the updated AT5555N II uses a hybrid system of Parameter Numbers (P-xx) and Value fields.
(If that doesn't work, consult your model-specific manual — firmware versions sometimes change the combo.) Stay tuned for more CB and amateur radio tips