Once you have adjusted a setting, press and hold the FUNC key or power the radio off and back on. This writes the new values to the EEPROM memory. Key Service Menu Parameters Explained
: Controls the Local Oscillator offset. Experts recommend adjusting this
Calibrates the Peak Envelope Power (PEP) limit for Upper and Lower Sidebands. 3. S-Meter Calibration (RX S1 / RX S9) anytone at-5555n ii service menu
Over time, the internal reference oscillator can drift due to temperature changes and component aging. The frequency alignment parameter allows you to center the radio perfectly on frequency. To adjust this accurately, you must connect the radio to a calibrated frequency counter or service monitor. 2. Power Output Tuning (POW / TX POWER)
The manufacturer's service manual provides the exact procedures and required test conditions for alignment. Once you have adjusted a setting, press and
Turn the radio OFF to save your new settings and exit the service menu. Key Service Menu Parameters Explained
) signal into the antenna jack to calibrate the software S-meter accurately. Critical Warnings and Best Practices The frequency alignment parameter allows you to center
What do you have available? (e.g., SWR/Power meter, dummy load, frequency counter)
To look at the AM modulation envelope and check for audio flat-topping or distortion. Conclusion