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Re: Topband: The AM Brick Wall

Subject: Re: Topband: The AM Brick Wall
From: "Joe Subich, W4TV" <>
Date: Thu, 25 Nov 2010 11:10:31 -0500
List-post: <">>
Hijacking an old e-mail for new information ...

For those looking for solutions to eliminate/reduce overload from
nearby AM broadcast transmitters, Jack Smith, W8OZA at Clifton
Laboratories now has two interesting products.

Model Z10022A is 9th order 1 dB Chebyshev highpass filter that
claims 1.6 dB insertion loss at 1.8 MHz, ~ 30 dB at 1.6 MHz, > 40
dB at 1.5 MHz and ultimate rejection around 100 dB below 1 MHz.
See: <>

The other filter is a band stop (band rejection) filter for the
AM band.  The Z10020 allows reception below 540 MHz for those who
are also experimenting at VLF or DX the NDB band.  See: 

I have no connection to Clifton Laboratories but since the "how
to deal with AM interference/overload" issue pops up periodically,
I wanted to get this information into the archives in case anyone
else needs it.


   ... Joe, W4TV

On 1/22/2007 6:27 PM, Tod-MN wrote:
> Has anyone more information regarding the schematic and values for this
> filter? Is it commercially available or is it 'one of a kind' and made of
> unobtanium?
> Tod, K0TO
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