The service menu on the AnyTone AT-5555N II contains critical alignment parameters that are not documented in the standard Instruction Manual. Crucially, there is no "factory reset" for this menu, so you must record your original values before making any changes. Accessing the Service Menu
To enter the hidden service menu, follow these steps precisely: Preparation: Ensure the radio is powered off.
Power On sequence: Press and hold the [MENU] and [MODE] buttons simultaneously while turning the radio on.
Code Entry: All LCD segments will illuminate for approximately 2 seconds. Within this window, release the buttons and immediately press the top-row keys in this specific order: [RB], [NB], [SCAN], [MEM], then [EMG].
Confirmation: The radio will enter the Service Mode, often defaulting to a specific channel setting (e.g., CH-01). Operating the Service Menu
Navigation: Rotate the [Channel] knob to scroll through the different menu items (there are approximately 59 settings).
Viewing Data: Key the microphone (PTT) to view the current value of a selected menu item.
Adjusting Values: While holding the PTT, rotate the [Channel] knob to increase or decrease the value.
Saving and Exiting: Power the radio off and then back on to store the new values. Common Service Menu Parameters
While most of the 59 items are used for factory alignment, users frequently access specific settings for performance tweaks:
CH-52 (RFG): Adjusts the RF Gain threshold. Increasing this value (e.g., from a default of 86 to around 105) can help reduce background static and "S7 noise" on newer units.
Frequency Alignment: Includes settings such as bfC (BFO frequency adjustment) and loC (Local Oscillator offset) for fine-tuning SSB operation.
Modulation: Includes parameters for AM modulation and AMC clamping levels; lower values typically equate to higher modulation. Summary of Hidden Menus Access Method Common Purpose Standard Menu Long press [MENU] User settings (BEEP, ECHO, TOT, etc.) Expansion Menu Hold [FUNC] + [SCAN] at power-on Resetting frequency ranges (e.g., 25.615–30.105 MHz) Service Menu [MENU]+[MODE] at power-on, then [RB, NB, SCAN, MEM, EMG] Technical alignment (RF Gain, BFO, Modulation)
Are you looking to fix a specific performance issue, such as high background noise or frequency drift? Anytone at-5555n II (version 2) - WorldwideDX Radio Forum
I understand you're looking for information on the AnyTone AT-5555N II service menu, specifically an updated or corrected version.
However, I need to provide a critical warning before proceeding:
On some updated mainboards, the entry method has changed to prevent accidental entry:
I've updated the service menu reference for the Anytone AT-5555N II radio to make routine adjustments and troubleshooting easier. Use this as a quick guide — be careful: changing service-menu items can affect radio performance. Only proceed if you know what each setting does.
For legitimate engineering or repair purposes, search for:
Do not trust random YouTube videos or forum posts claiming to have "the full updated list" unless they show before/after spectrum analyzer measurements.
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 anytone at5555n ii service menu updated
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
Anytone AT-5555N II service menu is a "hidden" configuration area used for fine-tuning the radio's frequency alignment and modulation settings. Unlike the standard background function menu, this requires a specific startup sequence to access. 1. How to Access the Service Menu
To enter the service mode on the AT-5555N II, follow these steps: the radio. Press and hold on some versions) button. While holding the button, turn the radio on Immediately press the following key sequence:
The LCD should now display the service menu codes instead of the standard frequency or channel. Google Groups 2. Service Menu Parameters
The service menu contains several technical alignment settings. Note that these may vary slightly depending on your firmware version (e.g., v3.0). : Adjusts the frequency of the 10.24MHz
(Beat Frequency Oscillator). This is crucial for clear SSB (USB/LSB) reception. fr0, fr4, fr5, fr9 : These correspond to the limit voltages
for fine-tuning at specific frequency increments (.00, .04, .05, and .09). They ensure smooth frequency adjustments across the varicaps. : Controls the Local Oscillator (LO) offset
. If your radio is off-frequency on USB/LSB, experts suggest adjusting first before tweaking IC9 (Modulation) : In some updated versions, this setting controls the modulation level
. The default is typically around 31, but it can be increased (up to 63) for louder transmit audio. Google Groups 3. General Navigation Select Parameter Channel Switch or press the key to scroll through available settings. Adjust Value : Turn the Channel Selector knob to change the numerical value of the selected setting. Save and Exit : Press the
key (channel knob) to store the setting, or simply wait 5 seconds for the radio to auto-save and exit to normal mode. Google Groups 4. Important Maintenance Tips Standard Background Menu
: For non-service adjustments like Mic Gain, TOT, or SWR protection, simply long-press the MENU button for 2 seconds during normal operation. Factory Reset The service menu on the AnyTone AT-5555N II
: If you misconfigure the service settings and the radio behaves poorly, you can perform a full reset by holding FUNC and SCAN while turning the radio on.
: Adjusting service menu values without a high-quality frequency counter or power meter can permanently degrade your radio's performance. Google Groups Are you looking to re-align the frequency specifically, or are you trying to increase your modulation for better audio? Anytone 5555n Ii Service Menu - Google Groups
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.
The AnyTone AT-5555N II Go to product viewer dialog for this item.
(Version 2) has fundamentally shifted how users align and customize their radios by moving almost all physical potentiometer adjustments into a digital Service Menu. This updated guide details how to access these hidden settings and what they control, based on the latest community findings from WorldwideDX Radio Forum and technical insights from MW0UZO. Crucial Safety Warning
Before entering the service menu, you must write down every original value. The AT-5555N II Turn the radio OFF
has no factory reset for service menu settings. Changing these without a reference can permanently de-align your radio's frequency or power stages. Always use a dummy load when making power adjustments. How to Access the AT-5555N II Service Menu
The entry sequence for the updated Version 2 (N II) is more complex than the original model. Preparation: Start with the radio turned OFF.
Initial Hold: Press and hold the MENU and MODE buttons simultaneously. Power On: While holding those buttons, turn the radio ON.
The Sequence: As soon as the LCD segments appear (about a 2-second window), release the first two buttons and quickly press the following buttons in order: DW, RB, NB, SCAN, MEM, and EMG.
Confirmation: If successful, "FM" (Factory Menu) will appear on the screen. Updated Menu Navigation & Controls
Scrolling: Use the Channel Selector knob to cycle through the menu items (typically up to 53+ parameters).
Viewing Values: Key the PTT (Push-To-Talk) on the microphone to display the current numeric value of a setting.
Changing Values: While holding the PTT, rotate the Channel Selector to adjust the value up or down.
Saving: Power cycle the radio (turn off and back on) to save your new settings. Key Service Menu Settings (V2 Updated)
Based on the latest technical reports, these are the most common adjustments sought by users: Label / Function Description & Recommendations #16 AM High Power
Sets the maximum carrier (dead key) for AM when the front panel power is at max. #17 AM Low Power
Sets the minimum carrier for AM. Often lowered to 2W for driving external amplifiers. #19 / 20 AM Modulation
Controls the AMC (Automatic Modulation Control). Lower values generally increase modulation swing. #52 RFG (RF Gain)
Updated Workaround: Increasing this value (e.g., from 86 to 105) can help mitigate "S7 noise" issues on newer boards. bfC BFO Frequency
Used to align the Beat Frequency Oscillator for USB/LSB modes. loC Local Oscillator
Sets the offset for the local oscillator to ensure frequency accuracy. Firmware & Software Alternative
For users who prefer a graphical interface, many of these "Background Functions" (such as Noise Reduction levels, SWR protection, and Mic Gain) can be adjusted using the official PC programming software and a compatible programming cable. However, core hardware alignment (like power stages and reference oscillators) usually remains restricted to the boot-up service menu. AT-5555 service menu alignment procedure
Veteran users will notice a few differences in the latest service menu revision:
Older versions of the AT5555N (the first generation) had a notoriously simple, albeit limited, service menu. However, with the "N II" revision and subsequent firmware patches (Version 2.0 and higher), AnyTone has expanded the service menu to include:
Warning: Entering the service menu voids your warranty if you aren't a certified technician. Power adjustments can damage your final transistors if done improperly. Proceed at your own risk.