I built a switch unit using a Dow coax relay and it's outside contacts to swap 
key and amp switching.  Was not totally convinced regarding isolation.

I rebuilt using a Radial transfer relay allowing the input to the out of 
circuit radio to be grounded.  Admit this is better if the relative S meters 
are telling the truth but I confess to remaining a tad concerned and now switch 
the unused rig to it's second antenna position which reduces crosstalk further.

Mike G3IAF
. 
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