Anytone At-5555n Ii Service Menu Today

The Internal Frontier: Exploring the Service Menu in Modern Radios

Rotate the main Channel Selector knob to scroll through the different adjustment items.

: With the radio off, press and hold the MENU and MODE buttons simultaneously while turning the power on.

If the button combination fails:

| Parameter Range | Typical Function | Adjustment and Risk | | :--- | :--- | :--- | | (S1-S12) | Power Output by Mode These parameters control the radio's power output for each mode (AM, FM, SSB). | Adjusts final transistor biasing and overall power levels in different modes. Risk: Incorrect settings can distort the signal (splatter), overdrive amplifiers, cause harmful interference, and potentially damage the radio's final amplifier transistors. | | Items 40-52 (CH40-CH52) | S-Meter Calibration (e.g., AF RS1, UL RS1, RFG) These control the accuracy of the received signal strength indicator (S-meter) across different levels (S1, S3, S5, S9, etc.) and frequencies. | Calibrates the analog-to-digital conversion for the S-meter. Risk: Requires a calibrated, precise RF signal generator. Without one, changing these will permanently ruin your S-meter accuracy, making it impossible to correctly assess signal strength. | | Items 53-59 | Frequency / BFO / VCO Calibration These settings adjust the Master Oscillator, Beat Frequency Oscillator (BFO), and Voltage-Controlled Oscillator (VCO) to ensure transmit and receive frequencies are accurate across the entire band. | Tunes the PLL and BFO for proper frequency synthesis and USB/LSB demodulation. Risk: Requires an accurate, calibrated frequency counter. Incorrect adjustments will result in your transmit frequency being off, making you impossible to tune in on SSB, and your receive audio will sound garbled as the BFO will be at the wrong pitch. |

: Your AM modulation or FM deviation is set too high. Back the values down toward the factory defaults.

If your radio is slightly off-frequency (people tell you you sound "bassy" or "muffled" on SSB): anytone at-5555n ii service menu

Press the or EMG key (depending on firmware) to store the changed value to the EEPROM memory. Turn the power knob to switch the radio off.

Only adjust values by 1 or 2 steps at a time, then test the radio’s performance.

Some units ship with AM carrier set above 4W, causing over-modulation on certain amplifiers. Lowering HI-PWR to 3.5W allows headroom for clean 100% positive peaks. The Internal Frontier: Exploring the Service Menu in

Use the loC setting to get the frequency as close as possible to the target frequency.

Ensures the radio transmits and receives exactly on-frequency (especially critical for SSB modes).

If the radio is restricted to the standard 11m band (CB): | Adjusts final transistor biasing and overall power

If your radio reports inaccurate signal reports, these settings calibrate the receiver display.