[Lowfer] 15 kHz bandpass filter - what's it for?

Wed, 11 Feb 2004 06:20:18 -0600

Hello Don,

Sounds like you must have found these under a table at a hamfest?

It seems the utility of these filters would depend on how sharp the
bandpass is.  A few kHz might make a good filter in front of a sound
card running as a "soft" receiver, where you convert from RF to 15 kHz
directly.  If they are more like cw bandwidth, they could be used as a
cleanup filter in the audio stages of a superhet narrowband receiver.

Roger
AD5T

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Don
Sent: Wednesday, February 11, 2004 4:11 AM
To: lowfermailmanqthnet
Subject: [Lowfer] 15 kHz bandpass filter - what's it for?

Hello group,
I recently acquired a pair of passive LC filters that are sharp bandpass
at 15 kHz.  At least that is what they demonstrate when hand swept with 
signal generator and scope.  These units are half the size of a brick
and are full of 1 percent tolerance components.  Any thoughts as to what
I might do to put them to productive use?   Would it be practical to
make a selective receiver with 15 kHz IF in order to use these units?  
I know 50.5 kHz has been used as an IF and utilized LC filtering to
achieve selectivity. 

I am betting that someone here will be able to answer my question.

Thank You,
Don    WN9V

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