[TowerTalk] how does one accomplish a 'stud' for elements?

[Michael Tope]

The elements on the Cushcraft XM240 are loaded with a combination lumped 
inductor and capacitance hat. I believe they are resonate at around 18 MHz.

73, Mike W4EF.............


On 1/3/2016 12:08 PM, john at kk9a.com wrote:
> How about omitting the linear loading and converting it to loading coils,
> which is probably a better option anyway.  My High-Q coil loaded 40m beams
> are not resonant on 15m, one is about 17 feet away from my middle 15m beam
> with no noticeable interaction.
>
> John Kk9A
>
>
> To:	"tower" <towertalk at contesting.com>
> Subject:	[TowerTalk] how does one accomplish a 'stud' for elements?
> From:	"StellarCAT" <rxdesign at ssvecnet.com>
> Date:	Sat, 2 Jan 2016 09:04:51 -0500
>
> Specifically adding something to a 4 element 40 to eliminate 15 meter
> interaction? I believe Optibeam does this – not sure how they do it. Is this
> just using the element with a parallel line tuned through a cap for max
> current
> on 15? If so any suggestions on how long to make it and where specifically to
> put it on each element 1/2?
>
> Or is there a way to use a relay, open normally, closed when on 15 that would
> add some impedance to the antenna causing it to be detuned at 15?
>
> Alternatively I can rotate the antenna 90 degrees but boy it would be so much
> better not to have to do that to avoid interaction on 15.
>
> thanks in advance,
>
> Gary
> K9RX
>
>