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Does this Shorty Forty Antenna work?



 
 
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  #1  
Old April 30th 04, 09:47 AM
Alex
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Default Does this Shorty Forty Antenna work?

http://www.flashwebhost.com/circuit/shortant.php

Hello, has anyone built this antenna and if so does it work well? I'd like
to try it as an short vertical dipole. Any thoughts? 73


  #2  
Old April 30th 04, 11:34 AM
Reg Edwards
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Hello, has anyone built this antenna and if so does it work well? I'd
like
to try it as an short vertical dipole. Any thoughts? 73

=================================

For design, including the loading coil, of short, center-loaded antennas,
download program MIDLOAD from website below. Coax or twin-line feeder
option.
----
.................................................. ..........
Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
.................................................. ..........


  #3  
Old April 30th 04, 12:52 PM
'Doc
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Alex,
Will any shortened antenna work as well as a 'full sized'
one? Not really, but it sort of depends on how much it's
'shortened' too.
Would this "shortened" doublet work well as a vertical
'dipole'? Probably as well as any 1/4 wave vertical with
the usual ground system (the 1/4 wave would be slightly
shorter, though).
Is this antenna worth building? I think any antenna is
worth building/trying if you like 'playing' with antennas.
Is it 'as good' as a 'real live' 40 meter dipole? Not really,
but then that depends on your circumstances. If you don't
have the room to put up a 'real live' 40 meter dipole, it'll
probably 'work' very well for you (anything's better than
nothing, right?)...
'Doc
  #4  
Old April 30th 04, 03:54 PM
Dave Shrader
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Default

It's been around for a long time. It is even included in the ARRL
Antenna Book.

Alex wrote:

http://www.flashwebhost.com/circuit/shortant.php

Hello, has anyone built this antenna and if so does it work well? I'd like
to try it as an short vertical dipole. Any thoughts? 73



  #5  
Old April 30th 04, 03:54 PM
Reg Edwards
Guest
 
Posts: n/a
Default


"'Doc" wrote in message ...
Alex,
Will any shortened antenna work as well as a 'full sized'
one? Not really, but it sort of depends on how much it's
'shortened' too.
Would this "shortened" doublet work well as a vertical
'dipole'? Probably as well as any 1/4 wave vertical with
the usual ground system (the 1/4 wave would be slightly
shorter, though).
Is this antenna worth building? I think any antenna is
worth building/trying if you like 'playing' with antennas.
Is it 'as good' as a 'real live' 40 meter dipole? Not really,
but then that depends on your circumstances. If you don't
have the room to put up a 'real live' 40 meter dipole, it'll
probably 'work' very well for you (anything's better than
nothing, right?)...
'Doc

=========================

Open-ended questions like this are quite in order. Doc, I like your way of
responding to them. Valuable when very often when no other replies are
offered.

In this particular case a relatively low, vertical, 40 meter doublet, only
12 feet long, would be not much more than one S-unit down on a full size
antenna. Just about noticeable. Whereas a high, full-size, 40m vertical
dipole would be out of the construction range of the ordinary amateur.

It is amusing to hear about relative antenna gains of 0.1 dB and better in
the presence of 10 dB readable flutters and fades.
----
Reg, G4FGQ


  #6  
Old May 3rd 04, 03:31 AM
funkbastler
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On Fri, 30 Apr 2004 08:47:35 GMT, "Alex" wrote:

http://www.flashwebhost.com/circuit/shortant.php


ok - this has nothing to do with the relative merits of the antenna,
but gee whiz - that web site has one heck of a description....

"It is a center loaded antenna with a loading coil at the center."

DUHHHH.....

Then there's the bit about connecting the coax shield to the center
of the coil and connecting the coax center conductor two or three
turns away, AND THE ILLUSTRATION SHOWS JUST THE OPPOSITE!

*S*I*G*H*

(I'll shut up now.)

--
-fb-







  #7  
Old May 3rd 04, 10:59 AM
Ron
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Default

funkbastler wrote:

On Fri, 30 Apr 2004 08:47:35 GMT, "Alex" wrote:

http://www.flashwebhost.com/circuit/shortant.php


ok - this has nothing to do with the relative merits of the antenna,
but gee whiz - that web site has one heck of a description....


The relative merits of the antenna are very clear . . . "Finding space
enough to accommodate 67 feet of wire" . . .


"It is a center loaded antenna with a loading coil at the center."

DUHHHH.....


You can't have a center loaded antenna 'without' a loading coil in the
center?

DUH?


Then there's the bit about connecting the coax shield to the center
of the coil and connecting the coax center conductor two or three
turns away, AND THE ILLUSTRATION SHOWS JUST THE OPPOSITE!


And your point?


*S*I*G*H*

(I'll shut up now.)


Unless you have something constructive. Point us to the articles you
have written . . .

Ron

 




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