These correspond to the fine-tuning voltages for different modes, controlling the varicap capacitors to adjust frequency accuracy. loC / LO: Controls the local oscillator offset. How to Fine-Tune Calibration
Release the buttons once the LCD screen changes. The display will show the first service menu parameter instead of the standard frequency screen. Navigating and Saving Changes
Once active, navigating through parameters is achieved by pressing the button or rotating the primary channel selector ( CH ). The service environment is broken down into critical alignment fields: Parameter Code Description Functionality bfC BFO Coarse Alignment
Use this to set the main frequency baseline. Adjust this first if the radio is significantly off.
The service menu provides a digital interface to control these electronic components. It allows for the precise adjustment of: Frequency calibration (Reference oscillator tuning) anytone at-5555n ii service menu
Before changing a single number, grab a pen and paper. Scroll through every single menu item and write down the factory-set hexadecimal or digital value. If you mess up, you can manually restore the radio to its factory baseline.
Entering the service menu requires a specific sequence of button presses during the radio's power-on cycle. Ensure the radio is completely turned off.
You should never adjust service menu settings blindly or by relying on "on-the-air" audio reports. To properly align the AT-5555N II, you need the following diagnostic equipment:
Press the [FUNC] button to move to the next alignment parameter. These correspond to the fine-tuning voltages for different
After making adjustments, turn the radio off to save the settings, or look for a "store" or "enter" confirmation method in your specific firmware version.
| Parameter (Channel) | Common Label | Function & Typical Adjustment | | :--- | :--- | :--- | | | RFG | RF Gain Calibration. A well-known adjustment for radios with high receive noise. The typical default is 86 . Increasing this value (e.g., to 105 ) can reduce the noise floor and make listening more pleasant but reduces the effective RF Gain control. | | CH-?? | TONE | Modulation Tone. There are separate parameters for AM, FM, USB, and LSB (e.g., AMTONE , FMTONE , USBTONE , LSBTONE ). Adjusting these changes the transmit audio's tonal balance. | | CH-?? | RXBPF | Receive Band-Pass Filter. The default is often 255 . Increasing this value can make the received audio sound "fuller" and less "thin" or "far away". | | CH-?? | TX Low Power (AM/FM/SSB) | Transmit Power on Low Setting. Adjusts the carrier or power output for the low power setting on each mode. | | CH-?? | TX High Power (AM/FM/SSB) | Transmit Power on High Setting. Adjusts the maximum power output for the high power setting. | | CH-?? | Frequency Calibration | Frequency Alignment. Sets the reference frequency for the entire radio, requiring precise measurement with a frequency counter. | | CH-?? | S-Meter Calibration (S9) | S-Meter Adjustment. Calibrates the point at which the meter reads S9 for a given signal strength. | | CH-?? | Modulation Limiter (AM) | AM Modulation Depth. Sets the maximum percentage of AM modulation, often to prevent flat-topping or overmodulation. | | CH-?? | ALC (Automatic Level Control) | Transmit Level Control. Adjusts the ALC to control the maximum transmit level across all modes. |
Note: Some versions may require a simpler sequence: hold MENU and MODE, power on, then press each button moving down the line starting with .
Calibrates the Peak Envelope Power (PEP) limit for Upper and Lower Sidebands. 3. S-Meter Calibration (RX S1 / RX S9) The display will show the first service menu
The Service Menu contains parameters essential for the functionality of the Phase Locked Loop (PLL) and the RF Power Amplifier. The exact numbering may vary by firmware version, but the functions remain consistent.
If you have any doubts or concerns, always consult a professional radio technician or contact your authorized dealer for support.
The AnyTone AT-5555N II is a highly popular, upgraded 10-meter amateur radio known for its robust power output, excellent modulation, and flexible programming. While the standard user menu allows you to change everyday settings like key beeps, display colours, and scan lists, the transceiver also features a hidden (sometimes referred to as the alignment or engineering menu).