[Antennas] Hairpin Monopole

Tue, 6 May 2003 21:47:40 -0700 (PDT)

--- "Robert Lay (W9DMK)" <[email protected]> wrote:
> ----- Original Message ----- 
> From: "Juan A. Bertolin (EA5XQ)" <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, May 06, 2003 10:06 AM
> Subject: [Antennas] Hairpin Monopole
> 
> 
> Hi to all,
> 
> Recently, looking into Internet for information
> about indoor antennas and
> antennas for reduced spaces I found the Hairpin
> Monopole article written by
> Wilfred Caron. It seems very interesting antenna, is
> there other places
> where I could find more information about this
> monopole?(I do not see clear
> the pictures and explanation of Mr. Caron) Any
> experience of some of you
> with this antenna?
> 
> I'm interested in using it for 20,40 and 80m...
>
_______________________________________________________________
> Dear Juan,
> 
> I have built a full size 40 meter version of the
> quarter wave folded
> vertical. I used a 35 ft. length of ladder line as
> the radiating element and
> suspended it from a tree. It gave a high real
> (resistive) component to the
> feed point impedance, as one would expect, and was
> easy to tune with a
> standard C-L-C tuner at its base. So far as
> performance is concerned, it has
> a low take-off angle by virtue of its intrinsic
> characteristics and a high
> efficiency without an extensive ground plane. I used
> the chain link fence
> around the yard as my earth connection. My only
> complaint about this type of
> antenna for amateur work is the same complaint that
> I have about all
> verticals in comparison with Herzian antennas - they
> just don't measure up
> in simple A/B switch tests in real QSO's
> .
> You may be interested to know that Mr. Caron was the
> author of the ARRL
> book, "Antenna Impedance Matching". I used his book
> in preparing the
> extensive Help file for my Smith Chart program,
> which can be found at my Web
> site. The help file is based almost entirely on Mr.
> Caron's book.
> 
> I would not recommend this type of antenna for
> multi-band use unless you
> have a remotely controlled tuner at the base of the
> antenna or are not
> concerned about the high SWR values that would be
> encountered on the feed
> line.
> 
> 73 de W9DMK (Bob Lay in Dahlgren, VA
> http://www.qsl.net/w9dmk
> 
> - - - 
> 
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> Larry Wilson KE1HZ [email protected]
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