[amsat-bb] Re: Arrow antenna reconfiguration results - UPDATE

26 Sep 2009

      as in the texts below,  there is something else going on here.
That Diplexor can not be all that bad. two reasons.
How many db down is the front to side of that antenna?
and I can not imaging someone would sell a diplexor that has greater 
than 20 db of losses.
because of the statement that how criticalpolarity was with the 
original, and now the antenna has to be nearly 90 degrees cross 
polarized to make it drop out  uhh
that close to 30 db,
at least 20,,
something else is going on here
Gary "Joe" Mayfield wrote:
...
...
Another issue I came across was how wide the beamwidth is of the Arrow
Antenna between the Arrow diplexer and the new diplexer.  I was wondering
if
...
this was going to happen and it did.  The reason that this happened was
with
...
the old diplexer, the signal attenuated so much that you had to be pointed
right smack dab on the bird, a few degrees off and you lost the signal.
Now, with the new diplexer, you can point the beam in the general
direction
...
and still copy the bird.  In most cases I had to turn the beam 90 degrees
before I completely lost the downlink!  Twisting the antenna to make
polarization changes makes absolutely no difference now.  This also
attributes to the fact that now I'm copying the entire pass without
dropouts
...
or fades.  Makes sense.  What I've regained over the lossy diplexer makes
up
...
for any polarization differences, etc. for a better copiable signal.
Next weekend I will have to try more passes and get a feel of how much
this
...
system has changed.
73,
Jeff  WB3JFS
Las Vegas, NV
DM26

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