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Hello,<br>
<br>
I've taken some time tonight to improve the radiation pattern
measurement software. The algorithm for auto-centering the rotation
of the pattern won't be fooled now by the presence of a non-centered
peak lobe. Full description of the software function and the
software itself have both been published to the <a
href="https://www.hamwan.org/t/tiki-index.php?page=Antenna+Analysis&structure=HamWAN">Antenna
Analysis</a> labs page. The radiation pattern for the <a
href="https://www.hamwan.org/t/tiki-index.php?page=Laird+SAH58-120-16-WB&structure=HamWAN">Laid
sector</a> has been updated and you can see the wonky alignment is
now gone!<br>
<br>
Since neither of these antennas are thrilling performers in the
HamWAN Labs tests, a couple more candidates have been added to the <a
href="https://www.hamwan.org/t/tiki-index.php?page=Sector+Antenna+-+120deg&structure=HamWAN">Sector
Antenna - 120deg</a> component engineering page. A HamWAN
community member who wishes to remain anonymous has generously
purchased sample antennas of the Teletronics and RF Elements brands
for lab testing. They should arrive some time next week.<br>
<br>
In the meantime, I've had a thought about how to improve F/B ratios
in these sector antennas. Using a sheet of aluminum and my <a
href="http://www.harborfreight.com/30-inch-bending-brake-67240.html">sheet
metal brake</a>, I should be able to manufacture traditional RF
shields, like this:<br>
<br>
<img src="cid:part5.04040309.01050205@bartk.us" alt="VARIA 14-19dBi
variable sector antenna 45-120°, 2.4-2.5GHz" title="VARIA 14-19dBi
variable sector antenna 45-120°, 2.4-2.5GHz"><br>
<br>
but without fancy holes or adjustable features. It might be enough
to keep that nasty high power adjacent RF out.<br>
<br>
--Bart<br>
<br>
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