[AMRadio] Question for K4KYV

crawfish crawfish at surfmore.net
Sun Sep 3 22:57:15 EDT 2006

I am not Don, but since he hasn't answered, I remember he found a filter at
some surplus place in the Washington, D.C area back several years ago. Seems
like the cutoff was 3400 Hz on the nose. Not a very expensive part then, but
IIRC fron his post of this last year, there are unobtainum now.
                                                         Joe W4AAB
----- Original Message -----
From: "Ed Sieb" <esieb at sympatico.ca>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Sunday, September 03, 2006 12:35 PM
Subject: RE: [AMRadio] Question for K4KYV

> I second that request!
> Ed, VA3ES
> -----------------------------------------------------------------
> From: Radio Station W5AMI
> Don,
> A month or so back, I sent you a screen shot of your audio spectrum
> because I was so impressed about how well your brick wall filter cut
> off the high end just right.  I wonder if you could describe the
> circuit you use to obtain the level of accuracy you have on the cutoff
> freqs to the list?  I have discussed this with some others, and told
> them about your system, however I didn't know exactly how you are
> doing it.
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