The service menu interacts directly with the transceiver's firmware to regulate hardware performance. Unlike consumer settings like backlight color or key beeps, the service menu controls core operational voltages and frequencies.
Before we dive into the button combinations, let’s understand why you might need to perform service work on the AT-5555N II.
This article explains everything you need to know about the , including how to access it, navigate the parameters, and perform common calibrations.
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You can tweak how wide the signal swings in FM mode. Turning this up slightly can help you punch through heavy QRM (interference), but pushing it too high will cause over-modulation and splatter onto adjacent frequencies.
Making changes to the service menu is a serious step. The radio does not reset these parameters to factory defaults through its standard user menu reset, meaning any changes you make are permanent unless you can find and manually revert them.
This hidden engineering menu allows operators to recalibrate internal reference oscillators, fix frequency drift, and fine-tune independent operating modes (AM, FM, USB, LSB) without cracking open the radio chassis. The service menu interacts directly with the transceiver's
While specific item numbers can vary slightly by firmware version, users on platforms like WorldwideDX Radio Forum have identified these key parameters: Description AM High Power Adjusts the maximum "dead key" for AM mode. #17 AM Low Power Adjusts the minimum "dead key" for AM mode. #19 & #20 Modulation
: Controls the default RF Gain level. Some users adjust this (often set to ~86) to reduce high background floor noise.
While keeping those two keys firmly held, turn the volume knob clockwise to power the unit up. This article explains everything you need to know
While exact firmware versions can vary, most AT-5555N II models feature these fundamental service parameters:
Before changing a single digit, write down every single factory value. Factory calibrations are unique to each individual radio unit; there is no "universal default" to restore if you mess up.
Synchronizes the primary synthesizer offset across different bands to prevent global drift. Important Precautions Before Making Changes
If the key combination fails, ensure your firmware is not locked. Some regional factory firmware locks out service menu access. In these cases, the radio must be unlocked via the PC programming software and a compatible USB data cable before the hardware button combination will register. To help tailor any further advice, let me know:
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