[Elecraft] Problems with KRX3A

[w4sc]

The config selection of  ANT=BNC / ANT=MAIN does NOT actually select which is used for KRX3 alternate antenna input.  When AUX input cable of the KRX3 is connected to the KAT3,  the NON-TRANSMIT antenna used for the KRX3.  Only one can be physically connected to be used by the KRX3.  If no ATU, the only connection that is available would be to the installed BNC AUX connection.  I believe this config selection may be inserting attenuation during transmit in the KRX3 signal path to provide protection.

For KRX3 AUX input  I would always build / config to use the BNC connection.  There are 2 points of failure in the ATU that would be catastrophic for the KRX3 if either of 2 relays fail.

Ben W4SC

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