I have a remote antenna switch made by Inline Instruments. The relay is model 103 and I also have the coupler that goes with it. I can't find any documentation online for it. I believe applying "X" volts to the coupler switches the relay from antenna A to antenna B. The question is - what is the required voltage to make the switch?
EDIT: I'm almost certain this is the same product that at one time was sold by and branded as Unadilla.
Tnx & 73