[amsat-bb] Re: FM receiver filters

Glen Zook gzook at yahoo.com
Thu Jan 1 08:17:37 PST 2009

You might find an old Motorola TU-540W filter around a two-way radio shop.  Those were used in equipment when the deviation was +/- 15 kHz and when the deviation was dropped to +/- 5 kHz the filters were replaced with the TU-540S.  They are for a 455 kHz i.f.

Glen, K9STH

Website:  http://k9sth.com

--- On Wed, 12/31/08, Art McBride <kc6uqh at cox.net> wrote:

From: Art McBride <kc6uqh at cox.net>

My point is that filter is not easily found in a 455 KHz center frequency. ECS, Inc.  makes 30 KHz wide filters in 10.7 , 21.4 and 45 MHz center frequencies in 2 and 4 pole. They are available from Digi-Key. 455 KHz is reserved for narrow band applications.


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