Good Evening,
It has been dropping into the 40s each night this week. I almost
started a fire in the woodstove. But, by noon it was back to 70 again.
I collected a lot of dry, bucked up wood and got my exercise. Ten more
truck loads and I'll be started. While I was complaining to the jays I
must have used my hands too actively. I saw three sets of ears flick in
my direction. About a hundred yards away, through the thinned fir
trees, I saw a doe, then a yearling, followed by this year's fawn. They
weren't moving too fast but they were looking at me. So were the jays.
I reviewed a few of my college texts this week: "Fundamentals of
Applied Electromagnetics" by F. T. Ulaby and "Antenna Theory - Analysis
and Design" by C. Balanis. All my book marks and penciled in notes sped
things up a bit. Now I need to spruce up the code I wrote around three
of the antennas I modeled. My code gave me radiation patterns for
training neural nets for 1/2 wave dipoles, 1/4 wave monopoles, and full
wave loop antennas. It will be fun to add transparency and shading
while I map them as 3D objects in space. I need to revamp the sliders
controlling height above ground and orientation. They were a kluge when
I created them, but worked well enough to create data sets to train my
adaptive ARTmap neural nets. Ulaby's book is a great primer on fields
and waves. Chapter 9 introduces antenna analysis for a 1/2 wave dipole.
Please join us on (or near):
14050 kHz at 2200z Sunday (3 PM PDT Sunday)
7047 kHz at 0045z Monday (5:45 PM PDT Sunday)
73,
Kevin. KD5ONS
_
There is no spoon
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