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

Thu, 12 Feb 2004 02:34:05 -0600

Thank you for the ideas.  
The filters came from a  1950's era  Italian made Collins /Celettra
Selective Voltmeter. It  covered 4 kHz thru 750 kHz in 6 bands.  The
instrument was corroded beyond restoration and took up too much room to
keep as a non functional monument. Thr filters and the oscillator coil
set were recoverable. 
Thanks again,
Don    WN9V

Tracey Gardner wrote:
> 
> The HP3586 Selective Level Meter uses a 2nd IF of 15.625kHz and achieves
> it's selectivity by the use of xtal and LC filters at that frequency.
> 
> Tracey
> 
> ----- Original Message -----
> From: "Don" <[email protected]>
> To: <[email protected]>
> Sent: Wednesday, February 11, 2004 10:10 AM
> 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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