Accessing the service menu requires a precise sequence at startup. Based on user reports, the most reliable method is as follows:
Never perform service menu adjustments while connected to a live antenna. You will cause local spectrum interference and varying SWR readings will skew your power calibrations.
Once inside the service menus, you will see a variety of parameters that control the calibration of the radio. These typically allow alignment for different modes (AM, FM, USB, LSB). anytone at-5555n ii service menu
If your radio is slightly off-frequency (people tell you you sound "bassy" or "muffled" on SSB):
Aligns the digital signal strength meter with standard RF signal levels. Accessing the service menu requires a precise sequence
After adding a preamp or external attenuator, you can realign S-9 to restore meter accuracy, helping you judge signal reports realistically.
These parameters dictate how loud and clear your transmitted signal will be. Once inside the service menus, you will see
For more information on the Anytone AT-5555N II, its features, and service menu, consult the following resources: