[TowerTalk] Greyline Performance antennas

[Kim Elmore]

Yeah, it's probably the best built antenna I've seen short of towers as 
antennas. It's quite heavy, too. I can see why you chose to not schlep 
it back to the States. I hope it's serving the local club well.

Kim N5OP

On 10/17/2020 5:37 PM, kdutson at sbcglobal.net wrote:
> Holy colossal vertical dipole!  You guys were serious.  N6BT made his antenna with pretty stout aluminum, and you found out why.  It was a bear carrying it from Houston to London to Malta, but worth the effort.
>
> 73, Keith NM5G
>
> -----Original Message-----
> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Jim Brown
> Sent: Saturday, October 17, 2020 5:15 PM
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Greyline Performance antennas
>
> On 10/17/2020 1:24 PM, Kim Elmore wrote:
>> Maybe I should have said "... making sure it has a good CM choke,"
>> especially since you've taught us how to make them! Even if the feed
>> is in the center (it could be if the transmission line is run up the
>> bottom
>> half) it still won't be balanced. A CM choke is always needed. I've
>> become convinced that balanced antennas make analysis much easier
>> (even
>> possible) but that in the real world, there aren't any.  I have no
>> idea what the electrical length is for 6 m or even 10 m, so the low
>> radiation-angle assumption might be invalid on those bands.
> Here are slides for a talk I gave on the Pacificon Antenna Forum several years ago on an 80M vertical dipole for our 7QP and CQP expeditions, based on N6BT's design ideas. Yes, it does need a serious choke were the coax feeds up through the tubing to the feedpoint.
>
> http://k9yc.com/80M-FDVertical.pdf
>
> Testing it in Glen's pasture showed it to significantly outperform an inverted Vee with the center at 46 ft, but mechanical issues with the design caused us to abandon it after modeling and building several alternative designs.
>
> 73, Jim K9YC
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-- 

Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP 
SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)

/"A great second violinist plays second fiddle to no one." //– Robert C. 
Marsh, Chicago Sun-Times./