Antenna Switch - default/no power setting

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Pro-95

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Ok, in my little world this is the solution but since my experiance with electronics is limited.....

On my antenna switch I made all the relays activated with the selector switch and connecting each conductor to the Normally Open part of the relay, meaning that when I select the relay by applying power to the relay the contact is made and the Normally Open becomes closed making the connection.

Now I want to add a default setting for instances of no-power or if I want to unplug from power supply.

So I think by changing one of my antenna ports to Normally Closed this would make a connection unless there is power to the relay.

So I need to provide a connection via the other relays to the power side of the default relay. However if all the relays connect to the same place, all the relays will become powered and I'd loose selectability.

So my little brain says the one-way traffic cop would work to make the common connection. So would making the connection with a one way diode stop power from returning to the relays?

Is it more complex than that? What size of diode? I'm using 12vdc relays.
 

LarrySC

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I would check with JT in Hicksville, NY on the strong signals board. He seems to be a match for you when it comes to antennas.
 
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