[MVMA] Today's antenna party at MVHS
Moe
ab8xa at arrl.net
Fri Dec 28 22:04:57 EST 2018
A little more detail...
When we got there all the dishes were swaying in the wind. Chuck's 8'
ladder kept blowing over and my 6' was walking across the roof.
The mast under the omni where the AGM5 used to be (aimed toward the
West Xenia water tank) is only one inch. The reflected NSM5 requires 1.5" so
it couldn't replace the AGM5 there.
The 1.5" mast previously was all the way outboard to the right, with the
reflected NSM5 on top and Chuck's reflected NSM3 below it.
It was moved inboard, with Chuck's reflected NSM3 at the top, and the mast
was raised about 2 feet to clear the repositioned AGM5.
A new 1.25" mast was positioned outboard to the right with the AGM5 at the
top aimed toward Xenia. I had to reassemble the AGM5 because it was setup
for horizontal polarity and DARA is vertical.
The reflected NSM5 could not mount on the required 1.5" mast and be aimed
at Xenia. It hit the 1.25" mast. So Chuck offered his Mikrotik LHG5 to
aim at
Xenia. It wound up below the AGM5 a little closer than I'd like, but the
former
is on channel 182 while the latter is on Channel 172.
We have another 1.25" mast I'd like to replace the 1" omni mast with
outboard
to the left... and move the LHG5 to it (that's where the AGM5 was). We
ran out
of day to do that.
The framework is now much more rugged and swaying MUCH less. But the end
result performance-wise for some systems may have been a slight loss.
I'd heard how hard it was to aim an airGrid and now I'm a believer. We saw
11-13 db S/N (4-5 db improvement) but getting it cranked down brought it
down
to 6-8, about a 1 db loss. I think that may have to do until spring.
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