[Antennas] Dipole "Multi-band" pairs?

Tue Nov 29 22:57:57 EST 2005

I tried making a 10m and 6m dual dipole. The 10m portion was easy. The 6m
portion was next to impossible to tune. I could do it, but the bandwidth on
the 6m portion was very narrow.
Sean
W8OKN
----- Original Message ----- 
From: "Charles Greene" <crgreene at cox.net>
To: "Philip Atchley" <beaconeer at sbcglobal.net>; <antennas at mailman.qth.net>
Sent: Tuesday, November 29, 2005 9:08 PM
Subject: Re: [Antennas] Dipole "Multi-band" pairs?
> Philip,
>> I modelled a 7/10 Mhz antenna using 4 wires using EZNEC and it didn't
> work well, so I refrained from building it.
>> 73, Chas, W1CG
>> At 08:50 PM 11/29/2005, Philip Atchley wrote:
> >Hi All,
> >
> >I realize that when making "fan" multi-band dipoles, even harmonicly
> >related bands are best (7/14MC etc) due to the unused dipole being
> >of higher impedance. How about Non-harmonically related. As they
> >are going to be used as guy wires on a push- up pole and their
> >relative lengths, I'm proposing the following "band pairs". The
> >legs of each 'pair' would be 'approximately' 90 degrees apart, guy
> >wire fashion.
> >
> >1. 7.2 & 10.1MC for the topmost Inverted Vee pair, perhaps using
> >the 7MC one for 21MC also. Are the 7 & 10MC freqs too close and
> >would they interact too much?
> >2. 14.2 & 28.6MC for the next lower pair on the mast. alternately
> >this antenna MIGHT turn out to be a 14/21MC pair. They will be
> >mounted lower than the low freq antennas to keep the Apex angle a
> >little wider and to space them away from the lower band antennas.
> >
> >Does anyone here see a 'problem' with these band 'pairs'. They will
> >be mounted above a sheet metal mobile home roof where the present
> >21MC single band Inverted Vee performs well as does the half sized
> >G5RV that these antennas will replace. The new Butternut HF-2V is
> >performing well on 75/40M and will remain. I'm trying to ELIMINATE
> >the use of a antenna tuner as much as possible!
> >
> >******************************************************
> >73 de Phil, KO6BB
> >If it's over 1dB above the Noise Floor, "IT AIN'T DX"!
> >
> >THE BEACONEER'S LAIR: http://www.geocities.com/ko6bb/
> >QSL GALLERY: http://photobucket.com/albums/y123/KO6BB/
> >Merced, Central California, 37.3N 120.48W CM97sh
> >
> >******************************************************
> >
> >
> >
> >
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