Gary,
I am not sure about all bands, but I have done it with 3 bands. I run my
160 inverted L, a vertical for 80 and a vertical for 40 all off of the same
feedline and ground radial system. At least for these three bands, they
don't have a lot of interaction. My 4NEC2 model showed this, and my
experience as I added each additional antenna wire required minimal or no
adjustment of the previous elements. My wires are spaced about 12" apart.
73, Joel
N9LQ
On Wed, Sep 19, 2018 at 3:35 PM Gary Smith <Gary@ka1j.com> wrote:
> My HF antennas are all wire verticals; 20M
> vertical, 30M vertical, 40M vertical, 80
> INV-V & 160 sloper. Using the Ameritron
> remote coax switch it allows me to select
> one of these antennas and this allows a
> match to everything from 160-6 except for
> 60 meters which I don't use anyway. All
> are connected to the radial plate which
> has maybe 40 or so 130' long radials. I
> use the 160 sloper for 160, 12, 10 & 6M (I
> now have a 7 el yagi for 6M)
>
> This latest thread has me wondering about
> what would be likely to happen if I didn't
> use the coax switch and instead ran all
> the wires off a common feed-point? The
> only think I can think of that jumps out
> at me is the possibility of harmonics.
>
> Perhaps harmonics are not an issue? I've
> long used a 40M antenna for 15M as well
> with no complaints. I used to use a
> Mor-Gain antenna as a Novice & General and
> it was a multi band dipole which seemed to
> work fairly well, but in the sunspot cycle
> peak back in the late 70's a coat hanger
> would let you work DX.
>
> 73,
>
> Gary
> KA1J
>
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