On Mon, 18 Oct 1999 16:22:54 -0400 Arthur Holmes <w1rzf@gis.net> writes:
>
> I would like to avoid mutual coupling between the guys on my tower
> for
> 20/15/10 and my two 80 meter phased verticals about 3/8 wl away. I
> have
> read the ARRL antenna manual which gives guidelines for insulated
> lenghths to avoid. In my case the last section to ground is 60 ft.
Sounds like a good 80M vertical to me ! (60 ft, gnded end)
The simple solution is to insert another insulator 27 ft down
from top insulator. This will leave a 33 ft grounded piece,
making a good 40M vertical. You could add a third insulator
if you want to avoid all resonances in the "old" bands. Or,
place the second insulator 40 ft down from the first. N4KG
> There
> is a turnbuckle 6 ft from ground and opening it changes the
> impedance of
> the closest vertical, ie coupling. The total lenghth of the guy is
> 71 ft
> broken by an insulator 11 ft from the top. Seems like I should
> relocate
> the turnbuckel an install an insulattor at that point. Comments? tnx
> Art
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