40m Endfed vertical QRP question
 

A endfed vertical for 40m is around 67'. Could a coil be placed in the
center of the endfed wire to shorten it to say 40'? This would make it
easier for my portable QRP work but will it work? Any thoughts on a short
ended 1/2 vertical?

73

A endfed vertical for 40m is around 67'

No it is not. A 1/4 wave vertical for 40M is around 33'. If mounted at
ground level it requires an extensive ground radial system to get good results.
If you are talking a 1/2 wave vertical better to feed it in the center.
An inverted "L" with 33' vertical and 33' horizontal is around 67'. Still
requires a good ground.

Could a coil be placed in the
center of the endfed wire to shorten it to say 40'

Yes, but you need to remember the radial requirements, and if you start
sticking coils in the antenna, then the matching starts being a problem.
This would make it
easier for my portable QRP
For QRP and portable operation 40m-10m, a 50'-100' inverted vee fed with
300-450 ohm balanced line and a tuner. Get the apex up as high as possible.
You can not beat this for multi-band portable operation.
73 Gary N4AST

Need Help Please wrote:
A endfed vertical for 40m is around 67'. Could a coil be placed in the
center of the endfed wire to shorten it to say 40'? This would make it
easier for my portable QRP work but will it work? Any thoughts on a short
ended 1/2 vertical?

73


You might want to check out the article in the May 2004 issue of QST on
ppg 28. It is for a shortened end fed 1/2 wave 80 meter antenna.

Mike

Down-load in a few seconds and run immediately program MIDLOAD for a
complete design including number of turns on the coil. Can be made easy to
feed with a link coupling. Unfortunately, one band only.
----
.................................................. ..........
Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
.................................................. ..........



"Need Help Please" wrote in message
le.rogers.com...
A endfed vertical for 40m is around 67'. Could a coil be placed in the
center of the endfed wire to shorten it to say 40'? This would make it
easier for my portable QRP work but will it work? Any thoughts on a short
ended 1/2 vertical?

73

Need Help Please wrote:
A endfed vertical for 40m is around 67'. Could a coil be placed in the
center of the endfed wire to shorten it to say 40'? This would make it
easier for my portable QRP work but will it work? Any thoughts on a short
ended 1/2 vertical?

It will certainly work and if you put the coil in the exact center of
the 1/2WL, it will satisfy the folks who claim that the net current into
the coil is the same magnitude as the net current out of the coil. :-)
--
73, Cecil http://www.qsl.net/w5dxp



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