TopBand: Re: Pennant

[Kenneth D. Grimm]

Hello Earl,
I am having difficulty visualizing the pennant antenna.  Has it appeared
on anyone's web site?  In this case I really believe that a picture, for
me at least, would be worth a thousand words.
73,
Ken K4XL

Earl W Cunningham wrote:
> 
> On Sat, 29 Aug 1998 18:09:59 EDT W6osp@aol.com writes:
> >What Is this Pennant I have been reading about? Bruce
> ======
> It's a variation of the Ewe that Jose, EA3VY and I developed using
> antenna modeling software.
> 
> The Ewe is very much influenced by the soil conductivity over which it is
> erected, requiring widely different-sized Ewes and widely different
> termination resistor values for best results depending on the soil
> conductivity.  Also, the Ewe requires two good ground systems, one at
> each end of the antenna.
> 
> The Pennant was developed to preclude these shortcomings of the Ewe.  The
> Pennant is virtually "terra-proof", as Jose says.  It is totally above
> ground and requires no connection to ground.  Different soil
> conductivities have virtually no effect on its directivity and input Z.
> It is also very broadbanded, with 30 to 40 dB F/B from 1.8 to 7.5 mHz.
> 
> I have named it the "Pennant" because of its triangular shape which
> resembles a pennant when erected.  It's optimum size it 14' high and 29'
> long, with the top at 20' high and the bottom at 6' high.  The
> termination resistor (900 ohms) may be installed at either the "point" of
> the Pennant, or in the center of the vertical section.  The feedpoint
> also may be in the center of the vertical section or at the "point", at
> the opposite end of the antenna from the termination.  The input Z is 900
> + j0 ohms on 160m.
> 
> Its height may be raised to 40' at the top or reduced to 3' high at the
> bottom with very little effect on its performance.
> 
> Directivity is the same as an Ewe, with a cardioid pattern with a deep
> null to the rear (about 43 dB F/B on 160m).  Gain on 160m is about -36
> dBi, increasing to about  -12 dBi on 40m.  No preamp is needed for it
> with my FT-1000MP.
> 
> We've also developed the "Flag" antenna, which is rectangular with the
> same dimensions (14' vertical, 29' horizontal, with the bottom wire 6'
> above ground).  It performs identically to the Pennant, but with about
> -30 dBi gain on 160m.  It is terminated (by 950 ohms) and fed in the
> centers of opposite vertical sections.  Its input Z on 160m is 950 + j0
> ohms.
> 
> Another similar configuration we've come up with is the Diamond.
> 
> Some hams are planning rotatable use of the Flag or Diamond using quad
> element construction methods.
> 
> 73, de Earl, K6SE
> 
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-- 
Ken K4XL
grimm@lynchburg.net
BoatAnchor Manual Archive - ftp://bama.sbc.edu

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