Anytone At-5555n Ii Service Menu -

Unlocking the Full Potential of Your Anytone AT-5555N II: A Comprehensive Guide to the Service Menu

• Battery calibration or cutoff thresholds
• Power management settings
• Boot options (safe mode / normal)

73 and happy tuning.

Confirmation: The screen should display "FM" (Factory Menu), indicating you have successfully entered the service mode. Essential Service Menu Settings anytone at-5555n ii service menu

| Parameter Code | What It Does | Typical Adjustment Range | Technician Notes | | :--- | :--- | :--- | :--- | | POWER HI | Sets RF output power on High setting (AM/FM). | 0 - 255 (Digital to Analog Convertor value) | Do not exceed 20-25W AM carrier. Set for ~20W carrier / 80W PEP. | | POWER LO | Sets RF output power on Low setting. | 0 - 255 | Usually set for 1W to 5W for driving amplifiers. | | F-ERR (Freq Error) | Synthesizer frequency trimming (PLL reference crystal). | -300 to +300 Hz increments | This requires a frequency counter. Tune to CH20 (27.205 MHz). Set to 0 Hz offset. | | SSB BIAS | Adjusts idle current for SSB linearity. | 0 - 255 | DANGER: High voltage inside. Do not touch. Set for ~100mA idle rise. | | AM CARRIER | Adjusts the AM carrier level relative to PEP. | 0 - 255 | Standard spec: Carrier is 1/4 of PEP (~25W carrier for 100W PEP is wrong). | | MOD AM | AM Modulation depth limiter. | 0 - 255 | Increase to ~95-98% using a scope. Do not go beyond 100% (flat-topping). | | MOD FM | FM Deviation level. | 0 - 255 | Standard is ±5 kHz deviation. | | S-METER 9 | Calibrates S9 signal level (usually -73 dBm). | 0 - 255 | Requires a signal generator. | | S-METER 1 | Calibrates S1 signal level (usually -121 dBm). | 0 - 255 | Requires a signal generator. | | SQ OPEN | Squelch threshold open point. | 0 - 255 | Sets when squelch opens with no signal. | | MIC GAIN | Global microphone preamp gain. | 0 - 255 | Be careful; too high causes distortion. | Unlocking the Full Potential of Your Anytone AT-5555N

Important Warning: Never change these settings without professional test equipment (frequency counters, signal generators). Improper adjustments can "unalign" the radio's transmission and reception across different modes. Always write down original factory values before making any changes. 73 and happy tuning