[Milsurplus] Beam Filter Info

[Bill Stewart]

I picked up a couple Beam Filters at the RARSFest (Raleigh NC) yesterday. I remember seeing them in ads back in the 1950s and 60s but never tried one. Wow, what a great audio filter! I plugged one into my HQ-150 last night and the station I was working was the only sig heard in the cans...and we worked for over an hour. Is there any info available such as schematic, orig. use and general comments. Seems like I remember a designations of FL-1 or FL-3? These have the Navy/US anchor and NAF 68304 plus a s/n. I would like to know more about these filters. 



Thanks, 73 de Bill K4JYS