It is a Collins F455-21Y with the Collins part number 526-9337-00. An internet search revealed that the filter was installed in the Collins amateur receiver line 75S-x (in the Collins receiver 75S-1 from 1958 - 1962 as. NOS Collins Mechanical Filter 455 KHz CF 1,2 or 4 KHz BW Symmetrical AM, 1,2 or 4 KHz BW Symmetrical (AM) NOS at the best. Cold Room Doors Catalogue.For many radio amateurs, itвЂ™s the end of an era: Rockwell Collins, which designed and manufactured mechanical filters for more than two generations of hams, has discontinued the filtersвЂ™ production.Grinnell Mechanical Piping Products require far less space than traditional welded or anged systems.

This modification is required to mount below listed Rockwell Collins filters on the main board of DX-SR9 series transceivers. A screw driver, soldering iron with proper tip and a desoldering tool is required. The modification should be carried out by your own responsibility.The company acknowledged that the filters have since been eclipsed by digital signal processing, and this was a significant factor in its decision. Collins 455 kHz mechanical filter Description.

USE THIS PAGE FOR ORDERING CIRCUIT BOARD WITH MATCHING NETWORK ONLY FOR COLLINS 500 Hz FILTERSThe INRAD model #712 300 Hz Collins filters are currently still available for many Yaesu and other transceivers while inventory lasts.

Collins Mechanical Filter Catalog