: Adjusts the RF Gain threshold. A common fix for high background noise (S5-S7) is tweaking this value (factory default is often around 86). Frequency Alignment : Includes settings like (BFO frequency), (local oscillator offset), and (fine-tuning limits). Google Groups Standard Menu vs. Service Menu For less intrusive changes, use the standard background menu by long-pressing the
The Anytone AT-5555N II service menu provides a wealth of options and settings that can help you optimize the performance of your radio, troubleshoot issues, and add new features. By following the steps outlined in this article, you can access and navigate the service menu with confidence. However, always exercise caution and follow proper safety procedures to avoid causing damage or affecting the performance of your radio. Happy operating! anytone at-5555n ii service menu
| Parameter Code | What It Does | Typical Adjustment Range | Technician Notes | | :--- | :--- | :--- | :--- | | | 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. | : Adjusts the RF Gain threshold
Before changing a single number, scroll through the entire service menu and write down every parameter name and its factory default value. If you make a mistake, you can manually revert it. Google Groups Standard Menu vs
: While holding those buttons, turn the radio ON. All LCD segments will light up for approximately 2 seconds.