LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #1   Report Post  
Old September 27th 03, 04:05 PM
Jerry
 
Posts: n/a
Default shortened dipole loaded

October's QST has an article "Designing a Shortened Antenna" pp 28-32. It
gives an example of a shortened dipole for 40 meters at 7007 khz. Dipole
length of the half-sized dipole [p30 "a second example"] is 10.61 meters.
This is 20 feet off ground using #12 wire. The formulas give a solution of
XL= +j1776 ohms or an inductance of 40 microhenries at 30 degrees from each
leg.


I tried to simulate this antenna on EZNEC. A 10.61 meter antenna at 7007 khz
gives impedance =11.33 - j 881.2 ohms.

If EZNEC is correct wouldn t I need an inductance of +j881.2 on each leg of
the dipole, rather than +j1776?

--
Jerry


 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
10m dipole and tuner G. Doughty Antenna 11 September 25th 03 03:05 AM
Off Center Fed Dipole: the "Windom" experience. Charles Wittnam Antenna 1 September 17th 03 07:49 AM
Off Center Fed Dipole: Windom HSQ Charles Wittnam Antenna 8 September 2nd 03 01:25 AM
Comet VA30 (base loaded tri-band dipole 40/15/10) PA3HHO Antenna 2 September 1st 03 07:33 PM
Dipole connected to grounded receiver? Tom Antenna 4 July 22nd 03 11:19 PM


All times are GMT +1. The time now is 08:19 AM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017