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Baluns redux

 
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nuckolls.bob(at)aeroelect
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PostPosted: Tue Mar 31, 2020 7:13 am    Post subject: Baluns redux Reply with quote

Thread copied from a private exchange:

=====================================================================

Quote:
Comments/Questions: Hi fron Dog Brenneman--first of all, I make all the
mechanics read your book and i use it quite often. Your book is sooooo good.

Thank you sir! I'm pleased that you've found it
so useful. Know that the book can also be downloaded
and stored on a personal device for easy reference:

http://www.aeroelectric.com/Books/Connection/

Quote:
Currently, we are doing a total re-wire of a Comanche and one of the items
is making a new balun for the "cat's whisker" antenna from RG 400.
I have your diagram here and printed out the steps to construct also.

That design is known as the "Pawsey Stub Balun"
described in detail here

https://tinyurl.com/tm26ktz

I have tested this design with a vector network
analyzer and found it to perform as advertised.

Quote:
I am confused with baluns--I see some designs wherein the center conductor
is continuous (just a loop) to the short (26 inch--or 17.7 inch) parallel
section to the main feed line and just the braid connects to the two points on
the phenolic disc.

Yes . . . the 'aviation balun' . . .

https://tinyurl.com/vrtuk3z

This thing has been repeated in countless locations including
AC43.13 . . . I (and others) have tested this design on
a VNA and found it to be completely bogus . . . I can
find no original source for it's design.

Quote:
In your design, the short section braid connects to the center conductor of the
main feed line. I also see some in which the braid tie-together at the end
of the short section is grounded to the airframe. I plan to go with your design
but I am always seeking knowledge.

Good on you! There are numerous designs for baluns
fabricated from coax or sometimes transformers wound
on high frequency ferrite cores. Of all choices I observe
the Pawsey Stub to be the simplest as well as being
verified for effectiveness.

Quote:
Thanx for your time--- remember, I am just pilot and mechanic--don't useb
ig words--humor intended

We are all limited in many respects . . . limits
handily mitigated by sharing. Thank you for
your interest.



Bob . . .


-----------------------------
Bob Nuckolls
AeroElectric Connection
P.O. Box 130
Medicine Lodge, KS 67104-0130
Mobile: 316-209-7528
Web: http://aeroelectric.com
------------------------------



Bob . . .


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