Paul, The combo of the KRX3 and K3S is not a problem.
There is an added capacitor for the KRX3A to increase the low frequency sensitivity (by reducing the noise component) - Important to those who want to use the KRX3 for VLF operation. I believe the instructions for modding the KRX3 to the KRX3A level should be available on the Elecraft website. The capacitor is a low profile large value tantalum type. It is soldered near the center of the board.
73, Don W3FPR On 7/5/2021 1:53 PM, Paul GACEK via Elecraft wrote:
Happy 4th to all those that celebrate it/care about it. I have removed a working krx3 (not krx3a) from a working K3. I have separately acquired a ksyn3A. Two questions; 1) what are the differences between the krx3 and krx3a? 2) is my combo of Ksyn3a and krx3 compatible with a K3s?
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