> Hi Steve,
>
> I don't recall ever seeing that done. What was the purpose of using an
> isolator there?
Steve will probably reply too, but I'll give you the quick answer. UHF
Micor mobiles all came stock with an isolator in the antenna network, just
like their big brother base/repeater stations. When the radio was in Rx
mode, a relay switch the reject port on the isolator to the receiver instead
of the load. When it was in Tx, the relay switched the reject port back to
the load. With this arrangement, you never had full PA power going through
the T/R relay, only reject power, so presumably they did it that way as a
means of prolonging the life of the relay contacts (just a guess).
--- Jeff
