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Ameritron ALS-606 band switching

I'm using the 6400 with SmartSDR 3.1.12, attached via a commercially made interface to an Ameritron ALS-606 amplifier. It has worked flawlessly for months, but suddenly the auto-band switching is no longer functioning. The amp works fine if I dial in the proper band manually. The manual says this problem comes down to one of three things -- is the radio sending the proper codes, is the interface working properly, or is there a problem in the logic circuit of the autoswitcher. Stop number one -- how to determine if the radio is sending the proper codes. Is there a way to register those codes in a logger and then compare them to what is correct? I'll appreciate any suggestions.


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