Topband: Shunt fed tower plus Marconi vertical phasing on 160 and80?

[Tom W8JI]

> I'm assuming the 1/4 wave on 160 would be about 130' which would be a half
> wave on 80 and that they would have to be fed via different networks.
>
> Has anybody done this?  Does the shunt fed tower work in a phased array
> situation, or would I be better off just using the insulated tower as a
> Marconi single element vertical?

I don't know how deeply you understand directional arrays and networks, but 
you could probably make it work with a couple T-network tuners and some 
relays just by cut and try. It might take a little fiddling around listening 
to signals, but there will always be a combination of what you could do with 
a T network or two that would provide deep nulls.

It is more "cookie cutter" to use series fed quarter wave elements with 
current feed (95% of people still do that wrong), but if you have a little 
patience and don't mind experimentation, you could certainly make it work. I 
phased dissimilar elements many times over the years, with the grossest 
mismatch a "T" phased against a shunt fed tower. All it takes is parts and 
patience. :-)

73 Tom