The factory calibration values tend to be consistent across different units of the same revision. While you should still record your own values, it is reassuring to know that you can rely on other users' default settings as a baseline for comparison if you are troubleshooting.
Newer firmware revisions feature locked "ceilings" on certain power parameters. Even if you raise the numerical value to its maximum, the microprocessor caps the actual drive current to protect the final transistors from thermal runaway.
Comprehensive Guide to the AnyTone AT-5555N II Service Menu (2026 Updated)
The parameters inside are factory-calibrated. Changing them without proper knowledge or tools can permanently degrade your radio's performance. A factory reset from the main user menu does restore changed service menu values鈥攖hese settings are a "one and done" affair, making it essential to proceed with caution. anytone at5555n ii service menu updated
The reference frequency alignment interacts directly with an internal temperature sensor. It is highly recommended to let the radio warm up at idle for at least 15 minutes before adjusting the REF frequency menu settings. Summary Checklist for Technicians
while powering on) wouldn't fix the underlying alignment. He needed the Service Menu The Ritual of Access
Visit the AnyTone official website or the support page for the AT-5555N II . Look for: The factory calibration values tend to be consistent
For 99% of users, the AT-5555N II performs admirably without any service menu intervention. For the remaining 1%鈥攖he tinkerers, the perfectionists, and the technically inclined鈥攖he service menu offers a powerful, yet dangerous, playground. Arm yourself with knowledge, respect the risks, and you can unlock a new dimension of performance from your AT-5555N II.
Ensure you have a proper dummy load and a quality SWR/power meter before adjusting power levels. 1. How to Access the AT-5555N II Service Menu (2026 Method)
Key the microphone (PTT) to see the current value of a selected item. Even if you raise the numerical value to
This adjusts the master reference oscillator (TCXO/crystal alignment). If your radio is slightly off-frequency (e.g., transmitting on 27.385.2 MHz instead of exactly 27.385.0 MHz), this value is tweaked while transmitting a continuous carrier into a frequency counter until the output hits dead-center. Common Technical Updates & Discoveries
Beyond FM deviation, some hobbyists have experimented with other settings with mixed results. For instance, one user mentioned adjusting the (Receive Band Pass Filter) setting from its default value to 255, noting it improved the "thin" and "far away" sound they were experiencing. Others have discussed but not defined parameters like AMTONE, FMTONE, USBTONE, and LSBTONE, although their specific functions remain unclear in public discussions.
Configures the hardware opening and closing limits for the automatic and manual squelch circuitry. Best Practices for Firmware Updates
To access the full menu, press the remaining buttons in sequence, usually starting from down to [EMG] .
, but only if you have a calibrated external frequency counter and a dummy load. The updated service menu on the AT-5555N II is a massive improvement over the older, clunkier interfaces. It turns a great production radio into a precision instrument.
