[Antennas] Ham stick dipole

[Frederick]

Hi Sam,
     I think you might be on to something with swapping the hamsticks with 
one another. After tuning them individually one is a fare amount longer than 
the other. So, after testing them individually at their new location I find 
the longer one is much lower in frequency. It looks like it is time to pull 
out the dremel again.

God bless,
Mark
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----- Original Message ----- 
From: "Sam Morgan" <s.morgan at linuxbasics.org>
To: "Frederick" <frederick at my180.net>; "antennas - qth.net" 
<antennas at mailman.qth.net>
Sent: Wednesday, June 13, 2007 4:31 PM
Subject: Re: [Antennas] Ham stick dipole


> Frederick wrote:
>> Hi
>>     Wanting to build a vertical dipole the quick and easy way, I bought a 
>> pair of 75 meter hamsticks and the matching dipole bracket. I used a 
>> noise bridge and SWR meter and tuned each hamstick to be resonate just 
>> above 3.9 MHz. When I then mounted both antennas on the bracket the 
>> resonate frequency dropped to 3.4 MHz. Any ideas on what happened? Do I 
>> really need to go through the entire tuning process again?
>>     Thank you.
>>
> I have 40m as well as 17m hamstick dipoles
> there is a way to tune them that is specified in the instructions
> do you have that instruction sheet?
>
> Locate the antenna where it will be installed.
> Now you set both sides equal.
> Check the resonant frequency,
> shorten or lengthen the ends as needed
> to get SWR as low as you can for your desired center frequency.
>
> Here's the part that *isn't* intuitive:
> Now unscrew the antennas and swap their sides.
> The stick that was on the ground side
> is now on the center conductor side.
> Now adjust for lowest SWR again,
> this time tune *only* the insulated, hot, center conducted side.
>
> That's what is in the instructions for the 901 dipole mount from 
> Lakeview.
> http://www.hamstick.com/901.htm
>
> Worked fine for me.
>
> -- 
> God Bless,
> Sam Morgan
> http://linuxbasics.org
> linux the lifetime learning experience
>
>