Anytone At-5555n Ii Service Menu [best] -

The service menu allows a technician to digitally trim these values without soldering iron or variable capacitors (trimmers). It is intended for daily driver adjustments to "squeeze more power" out of the radio.

Once inside, the navigation logic changes from standard operation:

Never perform service menu adjustments with an antenna connected. Transmitting sustained tuning carriers can create high SWR reflections and cause illegal localized interference. Use a high-quality, 50-ohm dry dummy load rated for at least 100 Watts.

This article serves as a guide to understanding, accessing, and navigating the service menu, enabling you to calibrate BFO (Beat Frequency Oscillator), adjust SSB (Single Sideband) fine-tuning, and optimize the local oscillator. Technical Overview and Safety Considerations

Do not max out the power settings. Pushing the service menu values to the maximum limits will overheat the final amplifiers, distort your audio, and cause severe splatter across adjacent channels. To help provide more specific guidance, tell me: anytone at-5555n ii service menu

: Used for fine-tuning frequency steps (voltages across varicaps) for specific frequency offsets (.00, .04, .05, .09).

The service menu contains dozens of adjustable parameters. The table below highlights some of the critical ones that should be touched by professionals with the correct diagnostic equipment and calibration data. These parameters are central to the radio's performance and should not be altered casually.

: Controls the local oscillator offset. Adjust this first if the radio is off-frequency on USB or LSB.

Also, never max out the power settings (e.g., S-08 ). The radio’s final transistors will overheat. A safe bump from 50W to 60W SSB is fine; going for 100W will smoke the radio. The service menu allows a technician to digitally

There are two primary methods reported for entering the "Hidden" or Service Menu on the version II: Start with the radio OFF .

If the button combination fails:

To adjust a value, rotate the or MIC Gain knob (depending on the parameter). Save by powering off normally.

Over time, the internal reference oscillator can drift due to temperature changes and component aging. The frequency alignment parameter allows you to center the radio perfectly on frequency. To adjust this accurately, you must connect the radio to a calibrated frequency counter or service monitor. 2. Power Output Tuning (POW / TX POWER) Transmitting sustained tuning carriers can create high SWR

Over time, or due to extreme temperature variations, the radio's internal reference crystal oscillator can drift slightly. This causes the radio to transmit or receive slightly off-frequency, which is especially noticeable as distorted voice audio on Single Sideband (SSB) modes. Sets the master clock frequency.

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.

buttons and adjust values using the main channel selector knob.

Once you have adjusted a setting, press and hold the FUNC key or power the radio off and back on. This writes the new values to the EEPROM memory. Key Service Menu Parameters Explained

A common question is whether the radio needs alignment out of the box. The consensus is a clear "no." From almost every source reporting on these, they are "dead nuts on" and ready to go.