Fine-tuning the modulation levels to prevent over-modulation or distortion, particularly when using aftermarket microphones.
Sets the modulation depth for AM, ensuring clear, high-percentage modulation. 3. Receiver and Transmitter Calibration
: Hold the PTT key and rotate the Channel Selector to increase or decrease the numerical value.
To access the service menu on the AnyTone AT-5555N II , follow the specific button sequence below. Note that this "hidden" menu is used for internal hardware alignment and calibration; changing these values without a frequency counter or signal generator can significantly degrade your radio's performance. Google Groups Service Menu Access Turn the radio OFF. hold the FUNC button while turning the radio Immediately press the following buttons in sequence: The display will change to show internal alignment codes. Google Groups Common Service Menu Codes anytone at5555n ii service menu work
The is a highly popular, modernized 10-meter amateur transceiver known for its excellent power output, crisp SSB performance, and robust build. While the standard AnyTone AT-5555N II Instruction Manual covers everyday features like the "Background Function Menu," it completely omits the hidden Service Menu .
If you find the radio in a non-functional state, you can try to perform a factory reset. To do this, hold down [FUNC] and [SCAN] while turning the radio on. Note that this may only reset user settings, not service menu alignments. Troubleshooting Common Issues
The AnyTone AT-5555N II is a highly popular, modernized all-mode ten-meter transceiver. While the standard user menu handles day-to-day operations, the hidden service menu allows technicians and advanced operators to calibrate internal parameters. Accessing and adjusting this menu requires precision, as incorrect settings can degrade performance or damage the radio. Understanding the Service Menu Receiver and Transmitter Calibration : Hold the PTT
Synchronizes the primary synthesizer offset across different bands to prevent global drift. Important Precautions Before Making Changes
A non-inductive 50-Ohm dummy load rated for at least 100 Watts. Never transmit calibration tones into an antenna.
Controls the digital gain stages for microphone input. Adjusting this can increase punchiness on AM and SSB, though setting it too high introduces heavy splatter and distortion on adjacent channels. Best Practices for Service Menu Modification Google Groups Service Menu Access Turn the radio OFF
: Ensure your DC bench power supply is delivering a stable 13.8V DC under load. If your power supply drops voltage when you transmit, your service menu adjustments will be inaccurate.
Increasing the RF power parameters beyond factory specs will overdrive the final transistors (MOSFETs). This causes rapid overheating, harmonic splatter, and imminent hardware failure. Service Menu vs. Software Modification
If you decide to enter the service menu for any reason, the most important rule is to
: Used to fine-tune the local oscillator if the radio is off-frequency on USB or LSB. Navigation and Editing