The 3rd edition of ON4UN's Low band DXing shows on pages 11-78 and 11-79 4
square antennas supported by a single tower in the middle which supports
higher band Yagis. In fact, I believe in 15-4 under antennas at ON4UN a
single tower supports a 4 square with a single radial for each vertical
wire. Certainly not an ideal radial situation but apparently it works. I
think we have all worked John on 80m.
73, Dan, N5AR
On Fri, Dec 10, 2010 at 4:32 AM, <TexasRF@aol.com> wrote:
> Hi Barry, I have no actual experience with this but common sense says that
> the answer depends entirely on the resonant frequency of the central
> structure.
>
> If it is resonant at 1.825 MHz, there just HAS to be a big effect on the
> four square pattern and vswr characteristics.
>
> But, as you probably know, there are simple and effective methods of
> detuning the central structure as described by W8JI.
>
> Or, if the central structure was purposely made to be part of the
> directional array, as in the driven element, the issue might be
> irrelevant.
>
> Very interesting question and worthy of following answers here!
>
> 73,
> Gerald K5GW
>
>
>
> In a message dated 12/10/2010 6:08:11 A.M. Central Standard Time,
> barry.kirkwood@gmail.com writes:
>
> Hi all:
> Would be grateful for any opinions, experience, modeling exercises etc on
> effect of placing a typical lattice tower with yagi on top in middle of
> the
> four verticals making a four square vertical array for 160m.
> Good idea? Bad idea? Are characteristics of tower critical?
> Tnx es 73
> Barry ZL1DD
>
> --
> Barry Kirkwood PhD ZL1DD
> barry.kirkwood@gmail.com
> NZ: 021 160 8999
> Thailand 081 235 1556
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|