I can't seem to figure out how to set it to the simplex frequency, 146.520. Always skips to 146.525 or 146.500.
Common solution for this problem is the setting of the frequency step size. That must be different from 25 or 12.5 kHz. Grid step must be set to 20 kHz or 10 kHz or 5 kHz.
According the technical description that is possible. Scroll to that specification point: "Frequency Step: 2.5KHz/5KHz/6.25KHz/10KHz/12.5KHz/20KHz/25KHz".