LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #12   Report Post  
Old July 3rd 11, 03:04 AM posted to rec.radio.amateur.antenna
external usenet poster
 
First recorded activity by RadioBanter: Aug 2009
Posts: 28
Default Does anyone have plans for a 4:1 air core balun that actually works?

On Jul 2, 8:39*pm, Owen Duffy wrote:
Michael wrote :


Since wavelength is short, I would be inclined to try to use a feedline
length of an integral number of half waves, and an effective 1:1 current
balun at the ATU. This minimises working voltages within the balun and
ATU (reducing risk of flashovers), without driving high losses in the
ATU are very low impedances.

If you think about your own requirements, and finding a solution that
fits, you will do better than Googling up HamUniverse articles and the
like.

Owen


When I calculate the feedline length am I correct in assuming that I
need to take in to account the velocity factor of the 460 ohm ladder
line?

Michael Rawls
KS4HY

 
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
Which is better, 2 separate toroidal cores for a Guanella 4:1current balun or 1 toroidal core? Owen Duffy[_2_] Antenna 1 June 25th 11 12:51 PM
Radio Works CW80 Balun Brian[_7_] Antenna 0 November 4th 08 05:49 PM
Plans for B&W BWD-65 & BWD-90 Folded Dipole Balun & Terminating Resistor Dave Antenna 11 November 25th 05 01:59 PM
A Single-Core 4:1 Current Balun Chris Trask Antenna 50 July 5th 05 08:23 AM
20:1 Balun Help FT240-67 Core Greg Antenna 0 March 10th 04 10:57 AM


All times are GMT +1. The time now is 05:23 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