Yeah, thats fair enough. I keep forgetting to switch of the external preamp, although the battery drain in minimal.
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I have the QMX+ so i have plenty of room in the case to install the preamp inside. I need to devise some sort of switch to rout the mic signal to the premap or not when the input is used as a CW key... But thats for another day...
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Cheers.
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Mel. M0KMD.