The rain in Seattle didn't just fall; it assaulted the pavement, turning the city into a smear of gray neon. Inside the cab of his battered Peterbilt, Elias gripped the steering wheel, his knuckles white. The static from his radio was a relentless hiss, a wall of white noise between him and the outside world.
He looked at the unit bolted beneath the dash: the Anytone AT-5555N II. It was a beauty—a 10-meter radio converted for CB use, shiny chrome faceplate reflecting the dashboard lights. He’d bought it from a guy in a truck stop parking lot in Tulsa who swore it was "peak-tuned by a wizard in El Paso." Elias had been having fun with it for a week, but tonight, the "wizard’s" work seemed to have backfired.
The audio was muffled, the output power was swinging erratically, and worst of all, the frequency display had locked into a weird offset mode he couldn't clear. He was dead in the water, unable to raise his dispatcher or his usual road dog, "Big Mike."
"You gotta hit the service menu," Big Mike had said over the phone before the signal cut out. "But be careful, Elias. One wrong move in there and you turn that radio into a brick."
Elias pulled into the gravel lot of an abandoned weigh station, the truck’s brakes hissing in the damp air. He killed the engine, plunging the cab into silence save for the rhythmic drumming of rain on the roof. He grabbed his flashlight and a spiral notebook.
"Okay," he muttered. "Service menu work. Let's see what this wizard did."
He remembered the sequence. It wasn't in the manual. This was the dark art of radio repair—the combination of button holds that unlocked the hidden firmware.
He held down the FUNC button and powered the unit on.
The display flashed a bright, alarming red, then switched to a three-digit number. He was in. The buttons that usually controlled volume and squelch now navigated a labyrinth of alphanumeric codes: PL, dL, FP, AL.
The first issue was the frequency offset. The display read FS 0.002. That was the culprit. Someone had shifted the reference frequency, knocking his transmission off-channel. He tapped the channel selector knob, the plastic clicking loudly in the quiet cab. He dialed it back to 0.000.
"Gotcha," he whispered.
Next was the power calibration. He keyed the microphone, watching the meter on the radio jump. The needle slapped the red zone instantly—dangerous. If he transmitted like that, he’d blow his final transistor, leaving him truly silent.
He scrolled through the menu until he found P0, P1, P2—the power adjustment pots in digital form.
"High power... P2," he mumbled, referencing the scrawled notes in his lap.
He keyed the mic again. The needle swung hard. He used the down arrow on the keypad, nudging the digital potentiometer down. Click, click, click. He watched the meter, waiting for the sweet spot. He keyed again. The needle swung smoothly, settling comfortably into the 40-watt range. Perfect.
He was about to exit when he saw the S0 setting—the squelch threshold. It was set to maximum paranoia, choking out weak signals. That explained why he couldn't hear Mike. He backed it off a few notches, allowing the static to breathe a little.
He took a deep breath. This was the moment. If he saved the settings incorrectly, the radio would default to factory zero, and he’d lose all the frequency alignment. He held the FUNC button again, watching the screen blink SA for Save.
"Come on," he coaxed. SA turned to --.
He powered the radio off, counted to ten, and powered it back on.
The display lit up in its soothing amber glow. The frequency was centered. 27.1850. Channel 19.
Elias picked up the mic, his thumb hovering over the transmit bar. "Breaker one-nine, this is the Night Owl. You got your ears on, Big Mike?"
Static. Just static.
Then, a burst of clarity cut through the rain. "Hey, Elias! You sound like a million bucks. Where you been? You were ghosting out all night."
Elias leaned back into the cracked leather seat, a grin spreading across his tired face. He wasn't a technician, and he certainly wasn't a wizard. But tonight, for a few minutes in the dark, he had mastered the machine.
"Just cleaning house, Mike," Elias said, dropping the truck into gear. "Just cleaning house."
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 anytone at5555n ii service menu work
: 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
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.
📸 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.
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.
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 The rain in Seattle didn't just fall; it
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 and navigate the AnyTone AT-5555N II service menu (hidden alignment menu), follow these steps as documented by users on forums like Google Groups and specialized CB blogs: Accessing the Service Menu
There are two common methods reported, depending on your firmware version or specific hardware revision: Method A (Direct Sequence): Turn the radio OFF. Hold down the FUNC button while turning the radio ON.
Once on, immediately press the following buttons in sequence: RB → NB → DW. Method B (Timed Sequence): Press and hold MENU and MODE while turning the radio ON. The LCD will light up all segments for roughly 2 seconds.
Within those 2 seconds, release both buttons and quickly press: RB → NB → SCAN → MEM → EMG. Key Settings & Navigation
Once inside, you can navigate using the FUNC button or the channel knob to scroll through various alignment codes.
CH-52 (RFG): Controls the RF Gain floor. Default is often around 86; lowering this can help if your S-meter is showing a high noise floor (S5-S7) even without a signal. bfC: Adjusts the 10.24MHz BFO (Beat Frequency Oscillator).
fr0, fr4, fr5, fr9: Fine-tuning voltage limit settings for different frequency steps (.00, .04, .05, .09).
loC: Controls the Local Oscillator offset. If your USB/LSB frequencies are off, adjust this first before tweaking the BFO (bfC). Critical Warning
The service menu contains roughly 59 settings that directly control the radio's hardware calibration.
Document everything: Write down your original values before changing anything.
No "Undo": There is no "reset" for individual service menu values; once changed, they are overwritten.
Risk: Changing these values without proper test equipment (spectrum analyzer, frequency counter) can result in the radio transmitting off-frequency or causing interference on adjacent channels.
Proactive Follow-up: Are you trying to fix a specific issue like off-frequency reception on SSB or a noisy S-meter? Knowing the goal can help narrow down which specific setting to adjust.
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 Title: Unlocking the Service Menu on the AnyTone
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
Review: Anytone AT5555N II Service Menu Work
Introduction
The Anytone AT5555N II is a popular amateur radio transceiver known for its robust features and performance. For users looking to customize their device beyond the standard settings, accessing the service menu can unlock a range of advanced functionalities. This review aims to provide an overview of the process and benefits of working with the service menu on the Anytone AT5555N II.
Background
The Anytone AT5555N II is a versatile radio that supports both analog and digital modes, offering users a wide range of communication options. However, to fully leverage its capabilities, accessing the service menu is often necessary. This menu allows for deeper adjustments and settings that are not available through the standard user interface.
Service Menu Access Process
Accessing the service menu on the Anytone AT5555N II involves a specific sequence of steps, which may vary slightly depending on the firmware version. Typically, it requires pressing a combination of buttons while turning on the radio. It's crucial to consult the user manual or online resources for the exact procedure to avoid any issues.
Features and Adjustments
Once in the service menu, users can adjust a variety of parameters, including:
Benefits and Considerations
The ability to access and modify the service menu settings on the Anytone AT5555N II offers several benefits:
However, there are also considerations:
Conclusion
Working with the service menu on the Anytone AT5555N II can significantly enhance the user experience, offering advanced customization and optimization capabilities. While it presents a learning curve and potential risks, for those willing to invest the time and effort, the rewards include improved performance and functionality. As with any modification, it's essential to proceed with caution and ensure that changes are made with a clear understanding of their implications.
Rating: 4.5/5
Recommendation: For users of the Anytone AT5555N II looking to explore beyond the standard features, engaging with the service menu is highly recommended. However, it's crucial to approach with caution, thoroughly research each parameter before adjustment, and ensure you're comfortable with the potential risks involved.
Once inside, the standard channel knob does not change frequency. Instead, it scrolls through the parameter codes. The button functions remap as follows:
Crucial Note: Write down EVERY original value before changing anything. Use a notebook. Do not rely on memory.
Entering the service menu on the AT-5555N II is not a simple button press. It requires a deliberate sequence, a holdover from the radio's lineage (originating from the Qixiang/AnyTone design family). To access it:
Upon successful entry, the radio will boot to a blank or diagnostic screen, often displaying a version number (e.g., V2.0 or V3.0) and then entering a mode where the main VFO displays hexadecimal or numerical values. You will know you are inside because standard channel-changing buttons now adjust internal parameters like PLL reference oscillators, S-meter gain, and power amplifier bias.
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.