[TowerTalk] 80M Ideas

[Fernando EC1CT]

Jack,
If your tower guys are non conductive, you could try a full wave delta loop 
in a triangle configuration and feed at one side for
vertical polarization. It would give you some gain, less noise and a lower 
radiation angle than your previous inverted vee...Do a google search or look 
for them at ON4UN´s book. Hope this help. 73
Fernando EC1CT // KD0IGJ
E-Mail: ec1ct at esbesaya.com
KR DX Group

--------------------------------------------------
From: "Jack White" <m5pro at hotmail.com>
Sent: Thursday, December 27, 2012 4:50 PM
To: "Towertalk" <towertalk at contesting.com>
Subject: [TowerTalk] 80M Ideas

> Hi
>
> I've been reading the ON4UN book and antenna articles online on and off 
> for a couple of years now but I thought I'd share my situation with some 
> more experienced Guys on here to see if I can perhaps find some new 
> information and ideas.
>
> I have a modest HF/6 station that covers 40-6. I have a painted 3 section 
> 60ft Versatower (suspect v. poor electrical connection between sections) 
> with an Optibeam OB1-4030, Optibeam OB9-5 and 5L 6M Yagi all mounted on a 
> 15ft stub mast and fed into an Array Solutions Ratpak. (Antenna pic on 
> QRZ) The 6M Yagi has grounded elements but the Optibeam elements are 
> insulated from the boom and tower. The station is working nicely now so I 
> feel it's time to add an 80M DX TX antenna. I am interested in 3.5MHz CW 
> only, so bandwidth/phone etc not an issue.
>
> In the past I've tried an 80M coax fed inverted vee with the apex at 
> 60ft - as expected dynamite out to a couple of thousand miles but no good 
> for DX. I've ruled out the possibility of shunt feeding the tower because 
> of the Optibeams and the poor connection between sections. So currently 
> I'm left with two ideas:
>
> MFJ-1792 or Butternut HF2V mounted 50ft from the tower (landscaped gardens 
> prevent mounting anywhere else)
>
> Inverted L hanging off the tower with approx 60ft vertical section.
>
> What I guess really matters is the tower's resonant frequency, looking at 
> the details above, would anybody like to guess? Because the Optibeams are 
> insulated from the tower do they still effect the tower's resonant 
> frequency? If it is resonant close to 80M I guess the RF fed into a vert 
> 50ft away would see it as a parasitic element?
>
> In the worst case scenario, if the tower messed with a vertical I could 
> always lower it before operating on 80M but it's not ideal.
>
> Apologies for any stupid questions and Merry Christmas to you all!
>
> Jack G8DX
>
> Sent from my iPhone
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
> -----
> No se encontraron virus en este mensaje.
> Comprobado por AVG - www.avg.com
> Version: 2013.0.2805 / Base de datos de virus: 2637/5989 - Fecha de 
> publicacion: 12/26/12
>