[Collins] Crystal filter help

[Glenn Little WB4UIV]

Can any one tell me the center frequency and response for Collins 
crystal filter 526-7712-001?
Google was not my friend on this.

Thanks
Glenn

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Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"