[INRAD] Help!

[W9MWS@aol.com]

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.
 
Thanks!
 
73, Mike W9MWS

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