I notice that my 346XT when sitting on my desk powered by its wall wart can have a distinct 60Hz buzz on top of the audio of my local VHF SmartZone system. My 396T, using the same wall wart, same antenna, and in exactly the same locations as the 346XT exhibits no buzz at all. I'm not sure if this is due to increased sensitivity of the 346XT, is a manufacturing defect, or is a design defect.
It's also worth noting that when I power my 346XT from the 12v car power supply and I'm monitoring VHF air I hear alternator whine when squelch is broken on the 346XT but not on the 396T. The same external antenna (MaxRad VHF with mag mount) was used in both cases.
Does anyone have similar findings with their XT radios?
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