The menu typically consists of several columns of numbers. Below are the most impactful parameters you will encounter and what they actually do.
The AnyTone AT-5555N II service menu is a professional calibration tool, not a toy. For the average owner, there is no work to be done inside it. Your radio left the factory aligned to tighter tolerances than you can achieve without a bench of test gear.
If you are seeking more features (like expanded receive or 10m/12m transmit), use the PC programming software. If you are experiencing drift or low power, the issue is likely a hardware fault (bad MOSFET, cracked crystal) or a simple menu setting in the standard menu (like RF power knob or Mic gain). Only enter the service menu if you understand phase-locked loops, have a frequency counter, and accept that one wrong turn of the knob will turn your AnyTone into a very fancy paperweight. In the world of radio alignment, sometimes the best work is the work you choose not to do.
Accessing the service menu on the AnyTone AT-5555N II allows you to adjust internal alignment settings such as frequency offsets and BFO (Beat Frequency Oscillator) calibration. Google Groups How to Access the Service Menu To enter the hidden service/alignment mode: the radio. Press and hold the button while turning the power Immediately press the following button sequence:
The display will enter the alignment mode, allowing you to scroll through parameters using the button or the channel selector. Google Groups Common Service Menu Codes
These parameters allow for fine-tuning the radio's performance for different modes (AM/FM/USB/LSB): Google Groups : Adjusts the frequency of the 10.24MHz BFO : Controls the local oscillator offset fr0, fr4, fr5, fr9 : Used for fine-tuning
voltages across varicaps to ensure even frequency steps (specifically for .00, .04, .05, and .09 offsets). Google Groups Standard Background Menu (User Settings)
For general customization (e.g., beep, timeout-timer, display settings) that doesn't require the hidden service menu: : Long press the button for 2 seconds. Navigation : Turn the Channel switch to select menu numbers (1–36) and press to enter a setting. device.report Frequency Expansion (Unlock Mode)
If you are looking to expand the frequency range (e.g., for 11m/CB use): the radio. Press and hold while turning the power Turn the channel switch to change between (Standard) and (Expanded: 25.615 to 28.305 MHz). to save; the radio will show "rES" then "rEND". Important Warning:
Service menu adjustments directly affect the radio's alignment. Write down your original values
before making any changes, as there is no "default" reset that restores these specific calibration numbers. alignment values typically used for calibrating USB or LSB carrier offsets? Anytone 5555n Ii Service Menu - Google Groups
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
: 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 —
Here’s a sample post you can use on a forum, social media, or a blog about working with the AnyTone AT-5555N II service menu:
Title: Unlocking the Service Menu on the AnyTone AT-5555N II – What You Need to Know
Just a heads-up for anyone running the AnyTone AT-5555N II – yes, there’s a hidden service menu, but accessing it isn’t as straightforward as older models.
After some digging and testing, here’s what I found:
🔧 How to enter the service menu:
Turn the radio off. Press and hold the FUNC button and the BAND button simultaneously, then power on the radio while holding them. Keep holding until the display shows "SERVICE" or a different firmware version indicator.
⚠️ What you can adjust:
🚨 Important warnings:
💡 Why even go in there?
Most people only need it to slightly lower dead key power for an amplifier, or to fix slightly off-frequency SSB transmit. If the radio is working fine – don’t touch it. Seriously. anytone at5555n ii service menu work
📸 Added a pic of the stock V5 service menu values for reference (see attached).
If you’ve been inside yours, drop your firmware version and any weird findings below. Let’s help each other avoid bricking these otherwise great rigs.
Unlocking the Power of Anytone AT5555N II: A Guide to Service Menu and Its Functions
The Anytone AT5555N II is a popular and versatile two-way radio that has gained a reputation for its reliability and advanced features. However, to truly unlock its potential, users need to access the service menu, a hidden section that allows for fine-tuning and customization of the device. In this blog post, we'll explore the world of Anytone AT5555N II service menu and its various functions.
What is the Service Menu?
The service menu, also known as the engineering menu, is a special menu that allows authorized users to access and modify advanced settings and configurations on the Anytone AT5555N II. This menu is not accessible through the standard user interface and requires a specific sequence of buttons to be pressed.
Why Access the Service Menu?
Accessing the service menu on your Anytone AT5555N II can be beneficial in several ways:
How to Access the Service Menu
To access the service menu on your Anytone AT5555N II, follow these steps:
Navigating the Service Menu
Once you've accessed the service menu, you'll see a list of options. Here are some of the key functions you can expect to find:
Common Service Menu Functions
Here are some common functions you'll find in the service menu:
Important Safety Precautions
When accessing and modifying settings in the service menu, it's essential to exercise caution:
Conclusion
The Anytone AT5555N II service menu offers a wealth of options for customization, troubleshooting, and upgrades. By understanding how to access and navigate this menu, you'll be able to unlock the full potential of your two-way radio. Always exercise caution when making changes, and consult the user manual or manufacturer's support if you're unsure.
Additional Resources
For more information on the Anytone AT5555N II and its service menu, we recommend the following resources:
Share Your Experience
Have you accessed the service menu on your Anytone AT5555N II? Share your experiences, tips, and questions in the comments below!
The Anytone AT-5555N II service menu is a powerful, hidden feature set used primarily for internal alignment, power adjustments, and signal fine-tuning. Unlike the standard user menu, this interface contains roughly 59 individual settings that directly control the radio's hardware parameters. Accessing it requires a precise power-on sequence and specific button combinations. How to Access the Anytone AT-5555N II Service Menu
To enter the service mode, you must follow a strictly timed sequence immediately upon powering the unit:
Preparation: Ensure the radio is connected to a dummy load or a well-tuned antenna.
Initial Key Press: Press and hold both the [MENU] and [MODE] buttons simultaneously while turning the radio on.
Timed Sequence: All LCD segments will light up for approximately two seconds. Within this window, release the first two buttons and immediately press the following buttons in exact order: [RB], [NB], [SCAN], [MEM], and [EMG].
Verification: If successful, the display will change to show the service menu items (e.g., beginning with modulation modes or specific channel codes like "FM" or "01"). Service Menu Operations
Once inside the service menu, navigation and adjustments differ from standard operation:
Scrolling: Use the Channel Selector (VFO knob) to scroll through the roughly 53–59 available parameters.
Viewing Values: Key the microphone (PTT) to view the currently stored data for a specific menu item. The menu typically consists of several columns of numbers
Changing Values: To adjust a value, hold the PTT button and rotate the Channel Selector up or down.
Saving & Exiting: Turn the radio off to save your changes and exit the service mode. Key Service Menu Settings & Calibrations
While many of the 59 settings remain undocumented officially, experienced users have identified several critical functions: Parameter Code Common Function User Adjustment Notes CH-52 (RFG) RF Gain Adjustment
Often set to ~86 by default. Increasing it (e.g., to 105) can help mitigate "S7 noise" issues reported on some newer units. loC / bfC Oscillator Offsets
Used for local oscillator and BFO alignment to fix "off-frequency" reception in USB/LSB modes. fr0, 4, 5, 9 Fine Tuning Limits
Controls the voltage limits for fine-tuning increments (e.g., .00, .04, .05, .09). IC9 Modulation Level Can be increased (up to 63) to boost transmit audio punch. Critical Precautions
Write Everything Down: There is no factory reset button for the service menu. You must manually record every original value before making changes.
Hardware Risks: Improper adjustments can lead to unstable oscillators or damaged components if transmit power levels are set beyond safe thresholds.
Frequency Expansion: For general frequency "unlocking" (expanding bands), use a different shortcut: hold [FUNC] and [EMG] while powering on to toggle between BAND 1 and BAND 2. Anytone 5555n Ii Service Menu - Google Groups
To access the service and alignment menus on the AnyTone AT-5555N II
, you typically use a combination of button presses while powering on the device. Please use extreme caution; modifying these settings without proper test equipment (such as an oscilloscope or power meter) can damage your radio or cause it to transmit outside of legal specifications. How to Access the Service Menu
The standard method to enter the alignment/service mode for this series of radios is: the radio. Press and hold the buttons simultaneously. While holding them, the radio using the Volume/Power knob.
The display should now show the service menu items (often starting with "IC9" or similar adjustment codes). Common Service Menu Functions Once inside, you navigate the menu by turning the knob and pressing the (inner channel) knob to select a setting. Modulation Adjustment: Look for settings labeled
. The default is often around 31; increasing this (up to 63) can boost your transmit audio level. Power Levels:
Various "POW" settings allow for fine-tuning the RF output power for different modes (AM/FM/SSB). SWR Protection:
Settings for the SWR protection threshold are typically found here or via the official AnyTone programming software (QPS 555 N2). Key Alignment Shortcuts Reset to Factory Defaults:
If you make a mistake, you can usually perform a full reset by holding while powering on and selecting "RES". Display Toggle: Short pressing switches between frequency and channel display modes. Offset Function: Long pressing (2 seconds) enters the offset (REP) menu for repeater work. device.report
It is highly recommended to record your original factory values before changing anything. Each radio is individually calibrated at the factory, and there is no universal "correct" number for every unit. Software For Anytone AT-5555N II and quick run.
To access the service menu on the AnyTone AT-5555N II , follow the specific button sequence below. Note that this "hidden" menu is used for internal hardware alignment and calibration; changing these values without a frequency counter or signal generator can significantly degrade your radio's performance. Google Groups Service Menu Access Turn the radio OFF. hold the FUNC button while turning the radio Immediately press the following buttons in sequence: The display will change to show internal alignment codes. Google Groups Common Service Menu Codes
Once in the service mode, you can scroll through settings by pressing the button and adjust values using the Google Groups
: Adjusts the reference frequency for the 10.24MHz BFO (Beat Frequency Oscillator). : Controls the local oscillator offset. fr0, fr4, fr5, fr9
: Used for fine-tuning the voltage limits for specific frequency steps (e.g., .00, .04, .05, .09).
: Specifically found in some versions to control modulation/audio levels (can be increased up to 63 for maximum audio). Standard Reset & Expansion
If you need to revert the radio to default or expand it for 11-meter use: Full Reset FUNC + SCAN while powering on. Frequency Expansion FUNC + EMG
while powering on, then use the channel selector to switch between "BAND 1" and "BAND 2" (Export Mode). Google Groups Important Safety Warning write down your original factory values
before making any changes. These values are unique to each individual radio's hardware components. functions or instructions for the PC programming software Anytone 5555n Ii Service Menu - Google Groups
The AnyTone AT-5555N II service menu is a hidden interface used for internal alignments like frequency offsets and RF gain levels. Accessing it requires a specific key sequence during boot-up, and because there is no factory reset for these internal values, it is critical to record your original settings before making any changes. Accessing the Service Menu
To enter the service mode on the AT-5555N II, follow these steps: Preparation: Turn the radio off.
Initial Boot: Press and hold the MENU and MODE buttons simultaneously while turning the radio on.
Key Sequence: Within 2 seconds of the display lighting up, release the first two buttons and quickly press the following buttons in order: RB, NB, SCAN, MEM, and EMG.
Alternative Method: Some versions use a sequence of pressing all 6 buttons from DW to EMG after the initial boot. Key Settings and Navigation Title: Unlocking the Service Menu on the AnyTone
Once inside, the radio enters a "Service Mode" where you can scroll through various alignment parameters.
Navigation: Use the CHANNEL selector to move through menu items and the FUNC button to scroll through sub-settings.
Viewing Values: On many versions, you must key the microphone (PTT) to see the current stored value for a specific menu item. Common Parameters:
CH-52 (RFG): Controls the default RF Gain level. Some users adjust this (often set to ~86) to reduce high background floor noise.
bfC / loC: Used for BFO (Beat Frequency Oscillator) and local oscillator offsets to correct off-frequency issues on SSB.
fr0–fr9: Specific alignment settings for different modes (AM, FM, SSB). Important Precautions
Record Everything: These values are unique to each individual radio's factory calibration.
No Software Reset: Performing a standard factory reset (holding FUNC + SCAN at power on) will not restore service menu values to their original state.
Equipment: Significant changes to BFO or frequency alignment should ideally be done with a frequency counter or signal generator to avoid "bricking" the radio's performance.
For standard operational changes like Roger Beeps or SWR protection, it is safer to use the AnyTone PC Programming Software rather than the hidden service menu.
Are you looking to fix a specific issue like off-frequency operation or high background noise? Anytone 5555n Ii Service Menu - Google Groups
The Anytone AT-5555N II service menu is a powerful tool for advanced users to perform internal alignments and "fine-tune" the radio's performance without opening the case. Reviewers generally find it highly effective for correcting frequency drift and transmitter/receiver alignment, though they warn that settings vary by individual unit. How to Access the Service Menu
To enter the hidden service menu, follow this specific key sequence: Turn the radio OFF. Press and hold the FUNC button while turning the radio ON.
Quickly press the following buttons in order: RB → NB → DW. Service Menu Options & Functions
Users have identified several key alignment settings within this menu that are not documented in the standard AnyTone Instruction Manual:
bfC: Adjusts the 10.24MHz BFO (Beat Frequency Oscillator) frequency. This is crucial for fixing unstable SSB receive quality.
loC: Controls the Local Oscillator offset. Reviewers recommend adjusting this first to get as close to the target frequency as possible before fine-tuning with the BFO.
fr0, fr4, fr5, fr9: These correspond to limit voltages for fine-tuning at specific steps (e.g., .00, .04, .05, .09). Adjusting these ensures the clarifier movement is smooth and continuous.
Modulation & Power: Some versions allow for adjusting "dead key" and swing settings to improve AM performance, which some users find weak out of the box. Performance Reviews
Alignment Accuracy: Expert reviewers on Google Groups note that using these settings can resolve issues where the radio receives slightly off-frequency (e.g., 1kHz off on CW or several hundred Hz on SSB).
Reliability: Compared to the older AT-6666, the AT-5555N II is praised for its "rock solid" SSB performance and superior noise filtering once properly aligned.
Cautionary Note: Each radio comes from the factory with unique software-defined values. Reviewers at Simonthewizard strongly advise recording your original default values before making any changes, as there is no "undo" for specific menu adjustments. Anytone 5555n Ii Service Menu - Google Groups
Before touching the buttons, you must understand why the service menu exists. The AT-5555N II is calibrated at the factory using automated equipment. However, shipping vibrations, temperature changes, or component aging can shift these values.
Common symptoms requiring service menu work include:
The Service Menu allows you to adjust these hardware parameters without soldering iron or trimmer capacitors.
Critical Warning: Entering the service menu and changing values incorrectly can render your radio deaf, silent, or completely inoperable. Work slowly. Document original values before changing anything.
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. |
Unlike older radios that required soldering jumpers, the AT-5555N II uses a software-locked hidden menu. The exact sequence is critical.
Step-by-step access:
If you did it correctly, the screen will look different. Instead of showing a frequency, you will see a numeric parameter (e.g., P-01 or d-01) and a value. You are now in the Service Menu.