nuckollsr(at)cox.net
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 Posted: Sun Jun 04, 2006 11:46 am Post subject: No Title |
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| Quote: | Comments/Questions: Hi Bob
Sorry to have to resort to taking your time,but I have not been able to
find any directions on making a balun for a nav antenna installation for
my RV8. I was told that it was in AC43-13, but I haven't been able to find
it anywhere. Can you point me in the right direction?
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No, AC43-13 wouldn't cover such a device. Here are a couple
of links you can look over:
http://n-lemma.com/calcs/dipole/balun.htm
http://en.wikipedia.org/wiki/Dipole_antenna
We used to wire our VOR cat-whiskers on the
single engined Cessnas with a balun back in the
60' but gave it up after a series of experiments
showed no perceivable difference between antennas
with baluns and antennas that simply attached
the center conductor to one leg of the dipole
and coax braid to the other leg.
Some folks believe in slipping ferrite toroidal
cores over the coax like this figure from the
AeroElectric Connection:
http://www.aeroelectric.com/Pictures/Antenna/Dipole_Antenna.pdf
However, subsequent to publishing that figure I've
done some testing in the lab and found that the
ferrite cores offer no observable improvement in
VOR receiver or GS receiver performance by their
use.
Therefore, it's my recommendation that you forgo
the use of either balun or ferrite cores and simply
attach the legs of your dipole to the center conductor
and shield of the coax.
Bob . . .
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