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Re: Re: MicroWave: 1296 Transverter design advice



> Date:          Mon, 1 Mar 1999 13:41:03 -0800
> To:            amsat-bb@AMSAT.Org
> From:          kbanke <kbanke@qualcomm.com>
> Subject:       Re: [amsat-bb] Re: MicroWave: 1296 Transverter design advice

> Here's another little bit of information from our San Diego Microwave
> Group.  For filters ahead of our mixers and power amplifiers we have had
> great experience with the Evanescent mode filters (waveguide below cutoff).
> These are extremely simple, always work and can be constructed for the
> bandwidth required. They consist of a short section of waveguide or
> rectangular tubing (typically about 3 inches of  WR-75 or WR-90) with a
> tuning screw or Johanson style microwave capacitor in the middle of the
> broad side, and two connectors spaced about .7 " on each side of the center
> with the center oin protruding through and soldered to the far side of the
> waveguide. Depending upon the tuning screw/capacitor these filters will
> tune down to 900mMHz and up through 5. 7 GHz & have About 2-3 db loss. I
> have made filters for 24 GHz using brass hobby tubing. The filter original
> article I  use is by Reed Fisher W2CQH.
>  - Kerry N6IZW -

Dear Kerry,

Very interesting!  I have not heard of this design before.  I would need to 
see a drawing to duplicate one.  Do you have a copy of the orginal artical
available?  This is something that I would like to try.

--73-- Dave WA0AUQ
> 
> ********************
> Kerry Banke
> kbanke@qualcomm.com
> Qualcomm Inc.
> Voice - (619) 658-3318
> FAX - (619) 651-1988
> Pager (text) kbanke@pager@qualcomm.com
> pager - 619-636-0273
> Office Location R-202D
> 
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