[Boatanchors] old cavity

[k8omo at juno.com]

         Hi Group, hope we have some Motorola guys here.
  I have aquired a "Motorola Precision selector cavity"
as it says on the side of it . 2 n type connectors ,one on each side at
the 
top. Two knobs to adjust the rod that goes down the middle .
  Of course this is used on receivers to "null" out a unwanted signal .
I would like to know what freqs it will cover .
  model   P 8390  
 serial      1231
size--23 "inches high  11 inches across
core on rod  3 1/2 " diameter  16 " long

any guess????I'm thinking 130 to 175 megs VHF ???
thanks
Don  k8omo at juno.com