Usually adjusted using an RF signal generator injecting a precise standard signal (e.g., -73dBm for an S9 reading) so your meter accurately reflects incoming signal strength.
Verifies accurate transmission frequencies down to the single Hertz.
There is no "reset" for this specific menu; changes are permanent unless manually reversed.
If done correctly, the radio will enter Service Mode, giving you access to the hidden parameters. anytone at-5555n ii service menu
Sets the bias and drive currents for the final RF amplifiers across different operational modes. The menu separates low, medium, and high power ceilings.
user wants a long article about the "anytone at-5555n ii service menu". This likely involves procedures for accessing hidden service menus, alignment, calibration, unlocking frequencies, etc. I need to provide comprehensive information. I'll search for various aspects. search results show some potentially useful links. I need to open result 0 from the first search, result 0 from the second search, result 3 from the fourth search, and result 2 from the fifth search. I'll also search for "AT-5555N II software programming" and "AT-5555N II reset".'ve gathered several sources. The article should cover: the purpose of the service menu, access procedures, menu navigation and key parameters (including warnings and risks), adjustments like RF gain, RXBPF, AM/FM/SSB power, clarifier settings, frequency expansion, service reset, software alternatives, and safety precautions. I'll structure the article with an introduction, sections on understanding and accessing the menu, key parameters, adjustments, expansion, reset, and precautions. service menu on the AnyTone AT-5555N II unlocks a powerful diagnostic and alignment tool, similar to the "secret garage" of a high-performance vehicle. This guide provides a detailed, step-by-step walkthrough for accessing and navigating this hidden interface, along with critical warnings to prevent permanent damage to your radio.
Calibrates the digital signal strength meter on the LCD display. Usually adjusted using an RF signal generator injecting
The service menu of the AnyTone AT-5555N II offers advanced users and technicians the ability to customize and fine-tune the performance of their radio. For instance, adjusting the transmitter power can be useful in optimizing the radio's range and signal quality in different operational environments. Similarly, tweaking the squelch settings can help in reducing background noise and interference, thereby improving the overall communication clarity.
| 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. |
To enter the service menu, follow this specific power-on sequence: If done correctly, the radio will enter Service
Requires an RF signal generator to feed a precise microvolt (
If your signal strength meter feels too generous or too stingy compared to a known reference radio, the service menu lets you calibrate the digital meter.
Press and hold both the FUNC button and the PUSH (Channel) knob simultaneously.
The service menu uses short, abbreviated codes on the LCD screen. While exact codes can vary slightly across firmware iterations, the standard parameters cover four main categories. 1. Power Output Alignment (PWR)
The entry sequence for the Service Menu on the AT-5555N II is distinct from standard CB radios and requires a specific "three-button" handshake.