[INRAD] Help!

[Bill Tippett]

W9MWS:

 >I have a filter marked INRAD.  It is an open frame (i.e.: No metal box
covering the filter) with 4 crystals mounted.  The crystals 
are  stamped 352 and
500 Hz.

 >What is this filter?  I think I went in my old Ten-Tec Omni VI+ but I  just
can't remember.

         Most likely an Inrad #762 for Orion.  I've never
actually seen one so cannot say for sure, since I thought
they were enclosed in a can like other Inrads.  Predecessor
was Inrad's #352 kit which was a 600 Hz @ 9.001500 MHz
4-pole roofing filter for Orion.  Picture of my #352:

http://users.vnet.net/btippett/inrad_.htm

                                         73,  Bill  W4ZV