Here are some common settings and options you may find in the service menu:
: Do not proceed unless you are fully aware of the risks and have the necessary test equipment. The community is clear on this point: "DO NOT TRY AND CHANGE THE S METER SETTINGS WITHOUT A SIGNAL GENERATOR". Even with the correct key sequence, you are working with the radio's core calibration.
If you need help resolving a specific hardware issue with your radio, please let me know:
"This is the 'In-Between,' Leo," Miller whispered. "Most folks shouldn't be here. One wrong turn in these hex codes and you’ve got a very expensive paperweight."
The Service Menu is organized into parameter blocks. Here are some of the most useful ones (naming may vary slightly by firmware version): anytone at-5555n ii service menu
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Used to lower AM dead key (e.g., to 2W) for driving external amplifiers. Modulation
The AnyTone AT-5555N II is a fantastic radio right out of the box. The Service Menu isn’t for casual users—but for those with the skills and tools, it transforms a great radio into a finely tuned machine. Treat it with respect, and it will reward you with unmatched performance on 11m and 10m bands.
Unlike the user-friendly front-panel menu, the service menu is a collection of low-level configuration settings (often ) that control the radio's core hardware calibration. These settings, such as fine-tuning power output, frequency alignment, and modulation characteristics, are typically set during manufacturing and are not intended for regular user modification. Many advanced users have noted that there is "zero need to go into the service menu" for general operation. Here are some common settings and options you
What your radio is showing (e.g., low audio, off-frequency, incorrect S-meter)?
The radio utilizes varicaps—diodes that act as variable capacitors—to control frequency. Internal settings manage the voltage limits applied to these components. Precise calibration of these voltages is necessary for the radio to track accurately across its entire operating range. 3.
Provides a clean, controlled microvolt signal to calibrate the receiver S-meter. Best Practices for Service Menu Tuning
The settings are often mode-specific (AM, FM, USB, LSB). Use the [MODE] button to switch to the desired mode before adjusting specific parameters. If you need help resolving a specific hardware
Hold the PTT and rotate the Channel Selector or VFO knob to adjust the value up or down.
| Parameter | Function | Typical Adjustment | |-----------|----------|--------------------| | rEF | Reference oscillator (PLL) | Adjust with a frequency counter to ±10 Hz | | HI-PWR | High power AM carrier | Set to 4W carrier (or 12W PEP for SSB) | | MOD-AM | AM modulation depth | Aim for 95–100% at 1 kHz tone | | SSB-ALC | SSB peak power limiting | Avoid exceeding 30W PEP (legal limit varies) | | S-9 | S-meter calibration | Apply -73 dBm signal and set to S9 | | SQ-THR | Squelch threshold voltage | Minimize for weak signal squelch | | BIAS-ID | Idle current for final transistors | Adjust only if replacing finals (dangerous!) |
A: No, there is no reset function for the service menu. This is why recording original values is an absolute necessity.
Sets the voltage trigger points for the Automatic Squelch (ASQ) and manual squelch circuitry. If your ASQ is cutting off the ends of transmissions or failing to open for weak signals, these parameters tune the hysteresis loop. 5. FM Deviation and Modulation Gain
Old Man Miller’s workshop smelled of ozone and solder—a scent that usually meant something broken was about to be reborn. On his bench sat the AnyTone AT-5555N II