I can push button B, but yet hear (at much reduced volume) conversations
on
the upstairs scanner.

Sure doesn't seem like 90 db isolation.

Is this what is to be expected on these cheap switches, or possibly just a
bum one, or... ?

Any thoughts would be most appreciated.


Try disconnecting the coax to the switched-out scanner from the switch and
see if you still hear the stations. It is possibly just pick up direct into
the cable etc.

Jeff