LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #6   Report Post  
Old March 11th 04, 08:23 PM
Jimmy
 
Posts: n/a
Default


"Toni - EA3FYA" wrote in message
...
Hi,

For various reasons I am considering building a trapped dipole
without traps. Well, not really. I would use pneumatical
(compressed-air) switches in place of the traps.

What I don't know is if the switches rated for 16A 250V AC will
stand the voltage at the edge of the antenna when open. Power
would be 100W, but I wouldn't mind reducing to 50W or even 25W if
that would make the switches work. Of course I would always
operate the switches without RF on the antenna. I know normal
voltages an antenna edges are much higher, but I also think that
250V working voltage probably means much higher isolation
voltage. Just don't know how much more.

Thanks for answers / ideas.

Toni - EA3FYA


I would think the switch should work well as lonfg as you do not transmit
while opening a switch. Most switches are rated for opening under full load.
If you rate the same swich for opening under no load it can be rated at
several times its normal rating. I experimented with something similar to
what you are doing with smaller relays and it worked fine. There were some
inherent problems usuing relays but your idea of using pneumatic switches
would over come all the problems I had..


 
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
Inverted ground plane antenna: compared with normal GP and low dipole. Serge Stroobandt, ON4BAA Antenna 8 February 24th 11 10:22 PM
40 meter dipole or 88 feet doublet Dick Antenna 2 February 6th 04 08:55 PM
Dipole Next To Home-Is That A Problem?? Xtx99 Antenna 2 November 26th 03 12:11 AM
shortened dipole loaded Jerry Antenna 11 October 2nd 03 12:57 AM
Comet VA30 (base loaded tri-band dipole 40/15/10) PA3HHO Antenna 2 September 1st 03 07:33 PM


All times are GMT +1. The time now is 09:02 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