[Antennas] Dipole "Multi-band" pairs?

Wed Nov 30 14:40:17 EST 2005

Ron,
Your post prompts a question (actually, several.....). I'm returning 
to amateur radio after ca. 4+ decades. In working out an antenna, it 
will be a center-fed dipole with tuner (approx. what you recommend) 
or an end fed Zepp (I used a Windom fed with 300 ohm line way back 
when).
My question has to do with lightning, etc. protection. What do you 
use for ladder line and where have you installed the device? (I note 
the Wireman has a nice protector). It seems there are more devices 
available for coax. Also---just to put all the questions for now in 
one package: should I continue from the protector to the house with 
ladderline (to a balun and then the tuner) or put a balun after the 
protector and then run coax through the wall of the house to the 
tuner. I realize some of this has to do with personal preferences--- 
but there are probably good reasons for one or the other as a basic 
choice.
Sorry for all the questions, but you seem to have the kind of antenna 
I'm considering.
I'll be using a LDG Z-100 tuner with an ICOM 718.
Thanks for advice --- from Ron or anyone else!
best
Grover A. Zinn ex-w5vyu
On Nov 30, 2005, at 7:57 AM, solo22 at sbcglobal.net wrote:
> If you need all these bands, why not just put up one inverted vee 
> dipole about 35 feet each side of
> feedpoint, feed it with 450 ohm window line to a good tuner like a 
> Johnson matchbox. Works great here for me. Just an idea. Merry 
> Christmas from Ron K6ZL
>>>> 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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