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<div class="moz-cite-prefix">Well, it seems the situation is a LOT
better with the parabolic 21dBi antennas:<br>
<br>
<img src="cid:part1.04080608.07030109@bartk.us" alt=""><br>
<br>
<img src="cid:part2.02040109.01010208@bartk.us" alt=""><br>
<br>
Since these are identical models and the variances seen in the top
trace represent twice their error, these are indeed quite nice
even leveled antennas, at least at this 2ft distance apart. Gotta
do more testing @ various other locations and separation distances
to verify everything is cool.<br>
<br>
--Bart<br>
<br>
On 12/11/2012 2:23 AM, Bart Kus wrote:<br>
</div>
<blockquote cite="mid:50C709AC.6050803@bartk.us" type="cite">
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Hello,<br>
<br>
So I tried to measure the reference antennas (simple dipoles).
It's kind of a disaster. With the antennas only 2ft apart:<br>
<br>
<img src="cid:part3.05080508.06050703@bartk.us" alt=""><br>
<br>
The received signal is pretty weak:<br>
<img src="cid:part4.07080302.08080302@bartk.us" alt=""><br>
<br>
The marker is down 20dB from the previous measurement:<br>
<img src="cid:part5.03030804.06070404@bartk.us" alt=""><br>
I guess that pair of sectors I was using were really helping
things out. I'm also concerned about the uneven response, but
that could be multipath given the really low signal levels. Does
anyone have any experience with antenna measurement like this?
I'm thinking my next step is using the 21dBi parabolic dishes as
the reference antennas instead. Having thought about it, the high
directional gain, although it would need precise alignment to make
accurate measurements, would help with ignoring/overcoming
multipath, no? Some of those peaks and valleys might disappear.
A 20dB range over the spectrum is pretty ridiculous.<br>
<br>
--Bart<br>
<br>
</blockquote>
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