LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #5   Report Post  
Old April 12th 04, 05:53 PM
Tom Bruhns
 
Posts: n/a
Default

I think I see where you're going with that, Jerry...that's pretty
cool. In fact, I can imagine making the center out of tubing and the
outer ends out of rod, and having it so the rod can be unscrewed or
otherwise unfastened and pulled out, making a very compact (narrow)
package for storage. Would have to be careful to make the rod
attachment a reliably low resistance so the Q of the effective
inductance would stay high. If the coax stub part is filled with
dielectric (like Teflon) it would give more flexibility about the
lengths and impedances.

Cheers,
Tom


"Jerry Martes" wrote in message ...
....

I'm not sure of the lengths of your "dipole" elements . I'm going to
assume you have a 1/2 wave dipole antenna shortened to about 1/3 wavelength
overall. That would have two identical elements about 1/6th wavelength
each. If this understanding is correct, I could suggest a method of
including 200 ohms in series with each 1/2 of the dipole.

A 1/6th wavelength long piece of 120 ohm coax would look like a 200 ohm
inductor if it was shorted at its other end.
Perhaps I could describe a method of building an antenna by using two
pieces of 100 ohm coax. It would look much the same as a conventional
centerfed dipole but its total length would be shorter than the usual 1/2
wavelength. If you dont already have a picture of what I'd try to describe,
maybe I can write more. But, I want to consider the outside of the coaxial
stub to be the radiating surface.

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
Compact Yagi Design for VHF????????????????????????? Dr. Slick Antenna 7 February 9th 04 12:40 AM
BiQuad Design Specifications for Microwave? Robert Antenna 0 January 21st 04 02:58 AM
Reflection Coefficient Smoke Clears a Bit Dr. Slick Antenna 126 September 10th 03 04:26 PM
Load matching puzzle Tom Bruhns Antenna 4 August 24th 03 01:22 AM
Best vertical 20m design? Tom Coates Antenna 1 July 11th 03 05:25 AM


All times are GMT +1. The time now is 09:38 PM.

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