[UK-CONTEST] Inverted V help

[g3ory at lineone.net]

Guys,

The answers are all in Les Moxon's book 'HF Antennas for All Locations'.

Presumably you are discussing a half wave dipole erected as an inverted
vee rather than the classic inverted vee which is a travelling wave antenna
and a lot longer.

Briefly, the 'inverted vee dipole' has a vertical component as part of each
half (due to the droop).  These two vertical components carry antiphase
currents and are spaced by about one eighth of a wavelength (although this
is rather subjective and is influenced by the uneven current distribution).
 Now two current carrying elements spaced one eighth of a wavelength with
antiphase currents = a W8JK array.  Hence you will get some bi-directional
vertically polarised gain in line with the antenna in addition to the usual
dipole like radiation (horizontally polarised and concentrated broadside
at low angles). 

Hope this helps a bit.  For more details read Les's book.

73

Bob
G3ORY

>-- Original Message --
>From: " Alex G3ZBE" <G3ZBE at theallans.fsnet.co.uk>
>To: "John Edwards / Lisa Clipstone" <lisaclipstone at btopenworld.com>,
>	<uk-contest at contesting.com>
>Subject: Re: [UK-CONTEST] Inverted V help
>Date: Sun, 9 Nov 2003 17:16:06 -0000
>Reply-To: Alex G3ZBE <alex at g3zbe.co.uk>
>
>
>Hi both,

I could do a computer model for you if you like.
Although I would imagine the performance and pattern would be pretty
predictable.

Alex
----- Original Message -----
From: "John Edwards / Lisa Clipstone" <lisaclipstone at btopenworld.com
>
To: <uk-contest at contesting.com>
Sent: Sunday, November 09, 2003 11:31 AM
Subject: [UK-CONTEST] Inverted V help


Hello Chris

First of I hope that you don't mind to much this unsolicited e-mail. I am
interested in inverted V's and it seemed y
>u had gained a lot of knowledge
in this area.

I Saw your advice about inverted V installations on a message board
recently. I have just installed a full sized 80m inverted V (appex around
35
feet and angle fairly wide, legs dropping to 8') and ha
>e been looking
around for user experience on this type of ariel. There seems to be  a lot
of conflicting information but the main area that I am interested in is
its
radiation patterns.

I was wondering if you had any experience of working JA, VK 
>nd ZL areas. If
so in what polar direction are the legs of the ariel? At present my one
is
running roughly TF - IK which is about 10-20 degrees west of North and 10-20
degrees east of south. This is broadside to VK short path.

I have worked recen
>ly VK3PA  (Al) on 100w but only just. Normally it takes
400. I have not heard one single JA although most of Europe seems to be
giving them 59. I am beginning to think there is a null in the ariel or
the
orientation is wrong? I hear many stations wo
>king DX with inverted V's. The
proof in the real world I guess but I have some doubts.

I have been looking at various sites on the web and it seems that computer
software designs show poor low angle radiation patterns on inverted V
ariels. In add
>tion the radiation is at angles off the ends.

What do you think?

Regards
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