Anytone At-5555n Ii Service Menu ((hot)) -

Settings are often displayed as abbreviated codes. It is critical to before changing them.

Transceivers must operate within specific technical parameters set by national communications authorities (such as the FCC or Ofcom). Unauthorized adjustments can cause the radio to transmit out of band or create interference, which is illegal.

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| 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. | anytone at-5555n ii service menu

If the radio is restricted to the standard 11m band (CB):

Modifying the service menu carries inherent risks. Treat this environment with absolute caution.

: Before changing any value, record the original factory setting for all 53+ items. There is no master reset that restores these individual calibration values once changed. Settings are often displayed as abbreviated codes

Performing a standard user-menu reset will not restore the service menu to factory defaults.

: All segments on the LCD will light up for about 2 seconds. Within this window, release the buttons and immediately press these keys in order: RB , NB , SCAN , MEM , and EMG .

Over time, the internal reference crystal oscillator can drift due to age and temperature cycles. This setting allows you to shift the master clock. Unauthorized adjustments can cause the radio to transmit

Because the service menu is intended for technicians, the access sequence must be performed quickly during the startup phase:

A: No, there is no official service manual for the AT-5555N II that is publicly available. The information that exists has been collated by users on forums.