Anytone At-5555n Ii Service Menu
: Turning the radio off usually saves the current settings, though it is highly recommended to record original values before making any changes. Common Service Menu Parameters
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.
AnyTone AT-5555N II Technical Service Manual (Internal Documentation). ARRL Handbook for Radio Communications, Alignment Procedures Chapter.
The service menu breaks down power calibration by mode. You will typically find separate parameters for: Sets the dead-carrier wattage for FM. anytone at-5555n ii service menu
: Aligns the output wattage when the front-panel power switch is set to "Low." 2. Modulation and Deviation (MOD)
There are two primary methods reported for entering the "Hidden" or Service Menu on the version II: Start with the radio OFF .
| 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. | : Turning the radio off usually saves the
A common issue following Service Menu access is the loss of user-programmed memory channels. The Service Menu access often triggers a soft-reset of the microcontroller.
service menu requires technical knowledge. Improper adjustment can significantly degrade performance, cause excessive power consumption, or permanently damage the radio. The service menu does not have a "factory reset" function for these specific settings. RECORD ALL DEFAULT VALUES BEFORE MAKING CHANGES. How to Access the AnyTone AT-5555N II Service Menu There are multiple "hidden" layers in the AT-5555N II , often depending on the firmware version. Method 1: The Main Boot-up Service Menu Turn the radio .
Sets the tight and loose limits for the automatic and manual squelch circuits. Best Practices for Radio Alignment You will typically find separate parameters for: Sets
Note: On some firmware versions, the entry method may be slightly different (e.g., holding LCR/MODE instead of BAND). If the above fails, try FUNC + MODE + Power.
Sets the bias and drive currents for the final RF amplifiers across different operational modes. The menu separates low, medium, and high power ceilings.