[Antennas] G5RV/inverted vee: Radiation Angles

2003年1月10日 20:21:21 -0500 (Eastern Standard Time)

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From: Durwydd MacTara=0D
Date: Friday, January 10, 2003 7:13:13 PM=0D
To: [email protected]; [email protected]; [email protected]=0D
Subject: Re: [Antennas] G5RV/inverted vee: Radiation Angles=0D
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In other words, the instruction sheet from Antennas West "Lied" to me whe=
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it said that a vee configuration would work? What I wanted was 20,30,40 =0D
omnidirectiional...=0D
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Well yes & no, it was assumed for many years that Inverted Vees would ac=
t
like inverted Vees (nearly omni directional ) on all frequencies above th=
e
fundamental.. when in truth any inverted vee used on a higher frequency t=
han
the fundamental will begin to exhibit high angel radiation which is of
course not what one normally wants for DX work.. Thus the multiband use o=
f
an inverted vee is not the best. here are a couple of sites you can go t=
o
to find out more.. What they are saying closely mirriors what I have
experienced over the year with inverted Vees wheather G5RV or Zepp type.=0D
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These observation have been born out in my experiences with the G5RV over
the past 20 odd years. They work great as a flat top , Poorly as and
inverted Vee If one is limited to space or support requirements that
mandate the use of inverted vees then you will be better off to use Trap =
or
paralell dipople types. =0D
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http://www.radioworks.com/Inverted-V/InvertedV.htm=0D
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http://www.cebik.com/gup/gup30.html=0D
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These Web pages explain the reasoning for not using the G5RV or anyother
Multiband Ladder line feed Inverted Vee .=0D
Hope this info is of some help to those who wonder why their G5RV or cent=
er
fed zepp in this configuartion is not producing the results they hoped fo=
r.=0D
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73 Dave =0D
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