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Old September 6th 08, 01:56 AM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Jul 2006
Posts: 172
Default E-Field across MEAT

Dear Student Mc Leod:

Roy Lewallen has a useful suggestion. I evaluate the performance of
inanimate objects in a TEM cell, which may be thought of as an expanded
transmission line. Zapping (an old EE term) an object with 100 v/m is not
difficult, however that is not likely to be significant in your case.

Your DUT (device under test) is a piece of meat. Room temperature meat
has a significant conductivity. Even at 100 kHz, the conductivity of the
meat results in the field amplitude decreasing rapidly below the surface of
a thick piece of meat. Thus, if you were to use a TEM cell to place the DUT
into a 100 v/m field, the DUT needs to be thin or you can not say that the
whole DUT was subjected to 100 v/m. While all of this is going on, the DUT
is exposed to air-born contaminates that may well be different than those of
the control.

If I had made this assignment, it would be because I expected the good
student to perform an analysis of the experiment and prove that it was most
unlikely to be a valid experiment. Alternatively, a student who I would
recommend for graduate school would present me with a paper that shows what
improbable measures would need to be taken (and why) to have a chance of
having a valid experiment. The poor student is one who does what he or she
is told to do without critical analysis.

I have lived long enough to have several of my past students as honored
colleagues. They all are able to think.

Make friends with people in the EE department or some practical
physicists.

Do report back on what you ended up doing.

Regards, Mac N8TT

--
J. McLaughlin; Michigan, USA
Home:
"Roy Lewallen" wrote in message
treetonline...
Do a google search on "TEM cell". That should get you pointed in the right
direction.

Roy Lewallen, W7EL

Jon Mcleod wrote:



 
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