I'm working on a design for an RF switch using latching relays to switch two transceivers between four antennas. Each transceiver will be connected to at most one antenna at a time. But suppose one of the relays fails, and both transceivers are connected to the same antenna. This could result in damage to one of the transceivers.
What is the simplest way to prevent against this condition? Can I use one set of contacts on each relay to verify the state of each relay? I was thinking of doing something like this and applying AND or NAND to the control circuit based on the state of the relay's contacts.
I imagine there is a best practice for doing this but I haven't been able to find any write-ups about it.