At 08:07 AM 9/26/2005, Tom Rauch wrote:
> > Did you look at this month's QST? You can build what
> > you need to measure this for less than a buck
>
>
>October? What page?
The article starts on page 36, "A Low Cost Automatic Impedance Bridge", and
describes using a sound card as an impedance bridge. It's an excellent
example of using the computational power in a PC and a sound card to do
something fairly useful. At audio frequencies, the parasitics and
calibration standards will work just fine.
However, it will be at AUDIO frequencies, and if there's anything where you
really, really want to make the measurements at RF, it's antenna components.
Also, there's the issue of wanting some sort of design tool to get in the
ballpark in the first place, and that's where programs like INCA are really
handy. The only thing that INCA doesn't do (at least as of a year or so
ago, Antonio might have updated it since then) is deal with skin and
proximity effect.
Paul Nicholson has a program called ACMI which does mutual inductance and
coupling as well. http://www.abelian.demon.co.uk/acmi/
I believe Paul's program uses Grover's tables.
Another similar program is called MandK by Mark Rzeszotarski is available at:
http://hot-streamer.com/TeslaCoils/Programs/MANDKV31.PDF for the docs
http://hot-streamer.com/TeslaCoils/Programs/MANDKV31.ZIP for the program
MandK uses direct numerical integration. I think it also does take into
account skin effect and,maybe, proximity effect.
For the real hard core.. There's probably eval versions of something like
HFSS or Maxwell3D around.
Try: http://www.ansoft.com/ansoftdesignersv/
>_______________________________________________
>
>See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
>Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with
>any questions and ask for Sherman, W2FLA.
>
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_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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