LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #2   Report Post  
Old September 12th 08, 05:11 AM posted to rec.radio.amateur.antenna
external usenet poster
 
First recorded activity by RadioBanter: May 2007
Posts: 97
Default Light,Lazers and HF


"Art Unwin" wrote in message
...
What is the main factor that prevents HF radiation from focussing
for extra gain?


1, Focusing the radiation involves using a parabolic antenna whose surface
area is several wavelengths in length
2. Since our definition of HF includes frequencies between 1.8 Mhz and
50mhz, the physical size of the reflector required would be too large for
the average ham to handle.
3. However, that does not prevent HF radiation from being focused, it just
address the practicality concerning costs.
Therefore the answer is: There's nothing to prevent HF radiation for
focusing for extra gain, as long as you build the antenna or beam in
proportion to the wavelengths. If the wavelength is 10,000 times larger than
that old TV dish, then simply build your "dish" 10,000 times larger, and in
the same proportions.


 
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
Announcement - The Radio-Mart Red Drap Is Now Second Rate - We Now Have Blue-Sky-Radio's Blue-Green Drap Fading . . . Into The Bright-White-Light ! {Come Into The Light !} RHF Shortwave 3 September 22nd 06 08:08 AM
FA vintage RCA on air light pete Swap 0 November 13th 03 04:30 AM
DC to light recommendation? Steve Cohen Shortwave 10 July 5th 03 01:43 PM
DC to Light Recommendation Steve Cohen General 0 July 2nd 03 07:17 AM
DC to Light Recommendation? Steve Cohen Homebrew 0 July 2nd 03 07:17 AM


All times are GMT +1. The time now is 08:26 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