I think it was originally intended to be a panel mount SMA. There was some recent discussion around Elecraft -possibly- developing a form of crude GPS-lock that may make use of this connector hole. No word on possible timeline. Bruce, N1RX > Anybody know what kind of connector is supposed to go in the REF.IN. > hole? It is apparently too small for a BNC. > 73 de Brian/K3KO
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