Changing certain parameters without proper test equipment can ruin your radio's calibration permanently. For instance, adjusting PLL-REF without a frequency counter to verify the output can shift your radio off frequency, making it unusable for SSB communication. If you do not have a frequency counter, oscilloscope, or RF wattmeter with a dummy load, parameters like PLL-REF, ALC, FM DEV, or any of the HI/LO power settings . These adjustments require precise measurement to be done safely and correctly.
If you calibrate the frequency immediately after turning the radio on, it may drift as the internal components warm up. Always let the AT-5555N II sit powered on for at least 15 to 30 minutes to reach its operational temperature equilibrium before performing service menu calibrations. Conclusion
The display will change to show alignment codes. You can then use the to access settings for specific modes (AM, FM, USB, LSB) and the FUNC button to scroll through individual parameters. Service Menu Parameter Guide
Use the (or the up/down microphone keys) to adjust the value of the selected menu item. anytone at5555n ii service menu updated
What is currently displayed on your radio during boot-up? Share public link
Calibrates the internal forward and reflected power sensors so the on-screen SWR meter accurately reads antenna mismatches. 5. Squeld and AGC Thresholds
Press and hold both the FUNC (Function) button and the PUSH (Channel selector push-button) simultaneously. These adjustments require precise measurement to be done
The firmware updates on newer production runs of the AT-5555N II have standardized the key combination required to enter the alignment mode. Step-by-Step Access Procedure: Turn the radio using the volume/power knob.
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
A common question from users is whether a firmware update will erase their carefully made service menu adjustments. Fortunately, user reports confirm that service menu settings are generally preserved during a firmware upgrade. Community member Dr_DX notes that after a successful firmware update, "values I had previously changed in the service menu remain in place". Conclusion The display will change to show alignment codes
Sets the dead-carrier power output for AM transmissions.
: As soon as the LCD segments appear (about a 2-second window), release the first two buttons and quickly press the following buttons in order: DW , RB , NB , SCAN , MEM , and EMG .
Fine-tuning the wattage across AM, FM, SSB, and CW modes.