nuckolls.bob(at)aeroelect
Guest
|
 Posted: Tue Mar 31, 2020 7:13 am Post subject: Baluns redux |
 |
|
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 . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
