Anytone At5555n Ii Service Menu Work May 2026
(Note: Exact button names may vary; consult AnyTone AT-5555N II hardware labeling. If these steps fail, the radio may require an alternate key combo or a firmware debug cable.)
The AT-5555N II has dozens of hidden parameters, but you only need to touch about 8 of them for 95% of service work. Here is the decoder ring for the most common codes.
| Parameter | Function | Typical Range | When to Adjust | | :--- | :--- | :--- | :--- | | rEF | Reference Frequency (PLL Master Clock) | 0 to 255 | Most common fix. Adjusts the master oscillator. | | PA-H | High Power AM/FM Bias | 0-255 | Sets final transistor bias for high power. | | PA-L | Low Power AM/FM Bias | 0-255 | Sets final transistor bias for low power. | | Pc-H | SSB High Power ALC Threshold | 0-255 | Limits peak envelope power on SSB. | | Pc-L | SSB Low Power ALC Threshold | 0-255 | Limits low power SSB. | | Mod | AM Modulation Depth Limit | 0-255 | Maximum AM percentage (Factory ~95%). | | S-1 through S-9 | S-Meter Calibration | Varies | Adjusts receive signal strength reading. |
The AnyTone AT-5555N II is a modern classic in the world of amateur radio and high-performance CB (11m) operation. It boasts a dual-core microprocessor, a full-color display, and impressive frequency stability. However, beneath its user-friendly interface lies a hidden, powerful, and potentially dangerous tool: the Service Menu. For the experienced technician, this menu is a gateway to recalibration and optimization. For the unwary, it is a path to rendering a $250 radio un-transmittable.
Once inside, you will see parameters labeled P-XX. Here is a breakdown of the most critical ones you will likely need to modify. Note: Firmware versions vary slightly, but these are standard on the V4/V5 hardware.
| Menu Item | Function | Typical Range | Why You Need It | | :--- | :--- | :--- | :--- | | P-01 | VCO Lock Voltage (Band A) | 0-255 | Diagnose Tx/Rx dropouts. Should be stable. | | P-07 | AM Carrier (Deadkey) Power | 0-255 | Most common adjustment. Raise/lower DK wattage. | | P-08 | AM High Power (Full modulation) | 0-255 | Sets max AM PEP. Balance with P-07 for 1:4 ratio. | | P-09 | LSB Transmit Power | 0-255 | Adjust SSB output on Lower Sideband. | | P-10 | USB Transmit Power | 0-255 | Adjust SSB output on Upper Sideband. | | P-11 | FM Transmit Power | 0-255 | Sets FM carrier power. | | P-15 | S-Meter Zero (Squelch threshold) | 0-255 | Calibrates S-meter to show "S-0" correctly. | | P-16 | S-Meter Full Scale (S-9 + 60dB) | 0-255 | Sets high end of signal meter. | | P-32 | PLL Reference Frequency (Master Oscillator) | 0-255 | The holy grail. Corrects frequency drift on TX/RX. | | P-45 | AM Modulation Depth | 0-255 | Sets percentage of modulation (avoid 100%+ to retain clarity). | | P-58 | Mic Gain Pre-Amp (SSB/AM) | 0-255 | Boosts internal mic preamp if external audio is weak. |
The anytone at5555n ii service menu work is not magic—it is engineering. By understanding the map of P-codes, respecting the dangerous parameters, and methodically adjusting values with proper test equipment, you can transform a "good" radio into a "great" radio.
Whether you are correcting a factory frequency error, fine-tuning your modulation for a competition audio setup, or matching your deadkey to a high-drive amplifier, the service menu is your surgical instrument.
Final Checklist for Success:
Your AT-5555N II is a Ferrari of the airwaves. Now, with this guide to the service menu, you have the keys to the engine management system. Drive responsibly, and enjoy the pristine signal quality that proper calibration provides.
73, and good DX.
Disclaimer: Accessing the service menu may void your warranty if modified outside of legal CB frequency limits (depending on your country). Always comply with local transmission laws. The author assumes no responsibility for incorrectly configured parameters leading to radio damage. anytone at5555n ii service menu work
Unlocking the AnyTone AT5555N II Service Menu: A Comprehensive Guide
The AnyTone AT5555N II is a popular ham radio transceiver known for its robust features and reliable performance. While it's a great device out of the box, some users may want to explore advanced settings and customization options. That's where the service menu comes in. In this write-up, we'll cover the process of accessing and navigating the AnyTone AT5555N II service menu, as well as some of the key settings and adjustments you can make.
What is the Service Menu?
The service menu, also known as the "alignment" or "calibration" menu, is a hidden menu on the AnyTone AT5555N II that allows users to access advanced settings and perform calibration procedures. This menu is intended for use by authorized service technicians and advanced users who are familiar with the technical aspects of the radio.
Accessing the Service Menu
To access the service menu on the AnyTone AT5555N II, follow these steps:
Navigating the Service Menu
Once you've accessed the service menu, you'll see a list of options. Use the following buttons to navigate:
Key Settings and Adjustments
Here are some of the key settings and adjustments you can make in the service menu:
Important Safety Considerations
When making adjustments in the service menu, exercise caution to avoid causing damage to the radio or affecting its performance. Keep in mind:
Conclusion
The AnyTone AT5555N II service menu offers advanced users and technicians a range of settings and adjustments to customize and optimize the radio's performance. However, access to these settings requires caution and technical expertise. If you're not experienced with working with radio transceivers, it's recommended to avoid making adjustments in the service menu to prevent potential damage or performance issues. Always consult the user manual and technical documentation before attempting any adjustments.
AnyTone AT-5555N II service menu is an undocumented feature primarily used for fine-tuning frequency alignment and modulation. While users report it is effective for resolving specific issues like "S7 noise" on the S-meter, it is generally considered complex and carries a risk of misaligning the radio if not done carefully. Google Groups Service Menu Performance & User Feedback Audio Modulation Improvements
: Users have successfully used the service menu (specifically the
setting) to increase modulation levels from the factory default of 31 up to 63 for "full audio". Addressing S-Meter Noise
: A common complaint for newer units is a high base noise floor (S5-S7) even with no signal. Adjusting the
(RF Gain) setting in the service menu (typically around value 105) has been noted as a working fix by some operators. Precision Alignment
: The menu allows for individual alignment of the local oscillator ( ) and beat frequency (
) for different modes (FM, USB, LSB). Experienced users recommend adjusting first to get as close as possible before tweaking for final steps to preserve other mode settings. Google Groups How to Access the Service Menu
Accessing this menu requires a specific sequence that is not found in the standard manual. Preparation (Note: Exact button names may vary; consult AnyTone
: Turn the radio off. Ensure all switches are in the upper position except for NB/ANL, which should be set to Activation : Press and hold both the buttons simultaneously while turning the radio on.
: Release the buttons and quickly press the following keys in order: RB, NB, SCAN, MEM, EMG Navigation Channel Selector to scroll through menu items (e.g., CH-52 for RFG). Key the to view the stored value and hold while rotating the VFO to change it. Service Menu vs. Standard Background Menu For most common adjustments, the standard Background Function Menu is safer and more accessible. Bob's CB Radio : Long press [MENU] for 2 seconds. Common Settings : Configure (levels 1-36), SWR Protection SSB Clarifier Bob's CB Radio
There is no official documentation for service menu settings. It is highly recommended to record original values
before making any changes, as a factory reset may not restore these specific internal alignments.
of known setting codes for frequency alignment or instructions for the PC programming software Anytone 5555n Ii Service Menu - Google Groups 24 Jul 2024 —
The Problem: Your linear amplifier requires a 2-watt deadkey. The radio keys 4 watts.
The Work:
Let’s tackle three real-world "service menu work" scenarios.
Honestly? Only if you have the gear.
If you don't own a frequency counter or a Bird wattmeter, do not open the service menu. Instead, send the radio to a reputable tech. The cost of calibration ($50-$80) is far less than the cost of a new AT-5555N II ($300+).
However, if you are a ham with a bench, the service menu turns the AT-5555N II from a "good off-the-shelf radio" into a precision instrument. The anytone at5555n ii service menu work is