: To expand the frequency range (e.g., for 11m/CB use), turn off the radio, press FUNC and EMG while powering on, then use the channel selector to switch between "BAND 1" and "BAND 2" before pressing FUNC to confirm.
: Your AM modulation or FM deviation is set too high. Back the values down toward the factory defaults. anytone at-5555n ii service menu
Connect the radio's RF output through a dummy load to a calibrated frequency counter. : To expand the frequency range (e