[Antennas] Dipole "Multi-band" pairs?

Tue Nov 29 21:08:28 EST 2005

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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