nuckolls.bob(at)cox.net
Guest
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 Posted: Fri Mar 07, 2008 12:12 pm Post subject: Coax termination and electrical theory explained. |
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At 07:42 AM 3/7/2008 -0800, you wrote:
| Quote: |
> The difference in actual performance in the
> flying airplane will be lost in the noise (pun intended). In theory,
> there is an advantage in the expensive, complicated solution. In
> practice, the advantage ain't worth the headache.
Maybe, maybe not. It depends on the details. But you have not tested it,
(nor has Bob).
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???? I've made a good living for over 40 years delivering
products to a customer's needs and in many cases, verifying
performance both in the lab and in the customer's application.
For you to make ANY assertions about what I have or have not
learned by experiment, or success of myself and colleagues
in the field is specious and without foundation.
| Quote: | I submit that when the HANDY SHORT-CUT solution is proposed as the
GENERAL solution, the best interests are not well served.
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You extrapolate much floobydust from the original question.
The goal was to make an electrically adequate connection between
a coax feedline and the classic stone-simple, rod-on-a-feedthru comm
antenna.
This style antenna is still offered by many suppliers not the
least of which is . . .
http://www.chiefaircraft.com/Aircraft/Antennas/Images/AS_AV534.jpg
and yields 76 hits on a Google search. So, returning to the
original question, what are your recommendations for attaching
a coax to this product? Further, if your recommendations involve
extensive $time$ to satisfy some goals for transmission line
matching or keeping the holes separated from the electrons, what's
the expected return on investment for making that effort?
You should know that the last time I designed one of these antennas
into an installation, I discarded the large ring-terminal intended for
shield braid connection to airframe (large area, low pressure) in
favor of the PIDG ring terminal (small area, high pressure) connection
of the shield to the airframe.
What we were discussing was NOT a SHORT-CUT as a GENERAL solution
but a well considered, time tested, current marketplace practice
to a very SPECIFIC application.
| Quote: | The coax terminations in electronics catalogs are neither difficult nor
complicated. Furthermore you can make you own in a pinch. So there are two
choices:
1) The right way.
2) The other way.
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There are MANY ways to work toward design goals. Some perform better,
some most more, some are not possible to implement in the present
situation. The hallmark of craftsmanship is achieving the best
solution to the task of the moment with resources at hand.
Bob . . .
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