I would be concerned about impedance mismatch caused by paralleling two low 
impedance sources.

That would lead to degraded performance. What is so difficult about 
providing a single pole, double throw switch to swap one BNC between the two 
outputs?  Or just mounting two BNC's?  There are very tiny switches that 
would do the job of switching one connector, but they would take up about 
the room of the second BNC.  You can get short nib BNC chassis mount 
receptacles that only require a lock washer and nut to mount in one hole.

Stuart
K5KVH 


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