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Re: Prime Star Dishes etc.



on 1/3/01 3:02 PM, Keeth Jim (Indy) at KeethJ@tce.com wrote:

> If you do the math, you find the image freuqency band is 9.8 to 10.3 GHz ...
> pretty close to 10.451 GHz!  The problem is, there is a microstrip band pass
> filter which passes only the 12.2 to 12.7 band and provides pretty good
> image rejection.  Someone who is very clever might find a way to cut that
> filter out and make it work for the 10.4 GHz band.

Depending on how the circuit is laid out and the type of substrate used,
it's probably pretty easy.  At 10 GHz, a microstrip filter will likely be
several open stubs spaced certain distances apart.  The transmission line
should be a solid line through all theses stubs.  If you go in with an
Exacto knife or Dremel tool you can just remove the stubs and viola! no more
filter!

If it is a stripline design (basically a microstrip with another layer of
dielectric and then a ground plane on top of the microstrip), it won't be so
easy to modify (and may not be possible).

73,

Jon
NA9D

-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)

Member:  ARRL, AMSAT, DXCC, NRA

http://www.qsl.net/ke9na

"A life lived in fear is a life half lived."

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