Anytone At-5555n Ii Service Menu ((better)) 90%

| Menu Item | Function | Typical Adjustment | |-----------|----------|---------------------| | | PLL Reference Frequency (Coarse) | Adjust for frequency counter accuracy | | S-04 | AM Power (Low) | Sets carrier level on AM mode | | S-05 | AM Power (High) | Sets peak AM power | | S-07 | SSB Power (Low) | ALC threshold for low SSB | | S-08 | SSB Power (High) | ALC threshold for high SSB | | S-11 | FM Deviation | Sets FM modulation width | | S-20 | S-Meter Zero (No signal) | Adjust until meter reads S0 with antenna disconnected | | S-21 | S-Meter Calibration (S9) | Inject S9 signal (50µV) and adjust |

A common question is whether the radio needs alignment out of the box. The consensus is a clear "no." From almost every source reporting on these, they are "dead nuts on" and ready to go.

buttons and adjust values using the main channel selector knob.

Adjusting power output levels or modulation depth beyond factory specifications can cause the final power transistors to overheat and fail. anytone at-5555n ii service menu

Release the keys once the LCD screen boots up into the service menu interface.

Over time, the internal reference crystal oscillator can drift due to age and temperature cycles. This setting allows you to shift the master clock.

For those looking to optimize or repair a radio, it is recommended to: | Menu Item | Function | Typical Adjustment

Controls the maximum frequency deviation for FM transmission (typically set for 2.5 kHz or 5.0 kHz depending on channel spacing rules). 4. S-Meter Calibration (RX S1 / RX S9)

If fine-tuning is uneven, cycle through the fr0 to fr9 settings while monitoring a frequency counter in each mode. C. Power Alignment (PA)

Sets the carrier power for AM (usually kept lower than FM to allow room for modulation swing). Adjusting power output levels or modulation depth beyond

Absorbs the transmitted RF power safely without broadcasting a signal over the air. Measures exact PEP and carrier power levels. Frequency Counter

: As soon as the display turns orange (within that 2-second window), release the Menu and Mode buttons and quickly press the following buttons in exact order: DW → RB → NB → SCAN → MEM → EMG

Incorrect adjustments can cause severe frequency drift, destroy your final transistors due to over-current, blow the voltage regulators, or cause your radio to transmit a distorted, splattering signal that violates spectral purity regulations.