If you own an , you already know it is a powerhouse in the world of 10-meter and 12-meter amateur radio, as well as a favorite among freebanders. This radio is celebrated for its robust build, excellent receiver sensitivity, and the famous "N2" firmware improvements over its predecessor.
Fine-tuning voltage limit settings for different frequency steps (.00, .04, .05, .09).
: Adjusting power settings too high can damage the radio's finals or amplifiers. Common Adjustment Parameters
Allows tuning the output power for different modes to ensure the radio operates at its maximum rated wattage (60W+ PEP on SSB) or to reduce it for driving an amplifier.
If your SSB audio sounds distorted or "splattery," the ALC is set too high. If no one can hear you, it is set too low.
: Always let the AT-5555N II run for at least 15 to 20 minutes before entering the service menu. Internal components expand with heat, causing natural frequency drift. Calibrating a cold radio will result in an off-frequency radio once it warms up during a long transmission.
🔧 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.
