: To clear all settings and return to defaults, hold FUNC and SCAN while turning the radio on.
Technician Tip: While it is tempting to max these values out, pushing the final transistors past their rated limits will cause thermal runaway, heavy harmonic splatter, and premature hardware failure. Keep adjustments within a conservative margin. 3. Modulation and Deviation (MOD / DEV)
Absorbs the transmitted RF power safely without broadcasting a signal over the air. Measures exact PEP and carrier power levels. Frequency Counter
Compare the service menu to the .
If you do not own a calibrated service monitor, frequency counter, RF wattmeter, and dummy load, you should look but not touch. How to Access the AnyTone AT-5555N II Service Menu anytone at-5555n ii service menu
The Service Menu contains parameters essential for the functionality of the Phase Locked Loop (PLL) and the RF Power Amplifier. The exact numbering may vary by firmware version, but the functions remain consistent.
An RF signal generator is required. A precise signal of -73 dBm (50 microvolts) is injected into the antenna jack, and the S9 parameter is adjusted until the display reads exactly S9. 4. Modulation and Deviation (MOD / DEV)
Pushing the power limits too high will overheat the final transistors and introduce severe audio distortion (splatter). 3. Modulation and Deviation (MOD / DEV)
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. : To clear all settings and return to
: If successful, the screen will display "FM" (for Factory Menu) instead of an "ERROR" message. Navigating & Saving Settings
: While holding those buttons, turn the radio ON. All LCD segments will light up for approximately 2 seconds.
To access the service menu on the Anytone AT-5555N II , use the following key sequence: the radio. Hold down the buttons simultaneously and turn the radio two seconds
Once the Service Menu is active, the standard operational buttons are remapped to navigation functions: Frequency Counter Compare the service menu to the
The AnyTone AT-5555N II Go to product viewer dialog for this item.
If successful, the screen will display (Factory Menu) or a numbered setting. Navigation and Controls
The AT-5555N II is typically factory-set for 28.000–29.700 MHz. Users often seek to expand frequency coverage.
The Anytone AT-5555N II service menu offers a range of options, including: