nuckolls.bob(at)cox.net
Guest
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 Posted: Sun Mar 09, 2008 7:32 pm Post subject: Coax termination, theory, and..do I balun? |
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At 04:40 AM 3/8/2008 -0500, you wrote:
| Quote: | I'm using a King KNS-80 and Narco 12D, and replacing the rg-58 in my spam
can with rg400 for my vor/glideslope catwhisker antenna,
Should I replicate the 40 year old balun where it mates with antenna? or
does the termination issue outweigh the benefits of the balun? Thanks Skip
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Not easy to measure, and almost impossible to tell a difference
by observation from the pilot's seat. We built thousands
of Cessnas with split conductors of a coax simply
attached to the cat-whiskers. Then somebody got religion
and for a time we built a bunch of baluns. Some time later,
we were having too much trouble with process . . . seems
the PVC and Polyethelyene insulations got somewhat gooey
at solder temperatures and unless the fabricator was
particularly careful, poor craftsmanship caused field
failures later. So we became heathens again and dumped
the balun.
Today, one may return to the old faiths with greater
probability of success . . . seems the insulations
used on RG400/142 withstand soldering temperatures
very handily. So if you feel the urge, you can craft
a balun as shown in:
http://www.aeroelectric.com/articles/BALUN/Balun_Fabrication.html
May your radios navigate on stations nobody else even
hears and may your antenna patterns be exemplary.
Bob . . .
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