Here’s the key sequence (confirmed across multiple firmware versions):
This setting adjusts the master reference oscillator (TCXO). If your radio is slightly off-frequency on Single Sideband (SSB) mode—meaning voices sound like "Donald Duck" or are too low-pitched—you can adjust this parameter. You must use an accurate frequency counter while transmitting a carrier on AM/FM/CW into a dummy load to align this properly. 2. Power Output Alignments (PWR / TX POWER) anytone at-5555n ii service menu
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. Treat it with respect, and it will reward
To exit and save, turn the radio OFF and back on again normally. 3. Key Service Menu Settings and Calibration Procedures or due to temperature fluctuations
Rotate the Channel Selector knob to change the numerical value of the selected setting.
This setting adjusts the reference oscillator to ensure the radio transmits and receives exactly on-frequency. Over time, or due to temperature fluctuations, a radio can drift off-frequency (especially noticeable on SSB modes).