I would not use linear loading, not high Q enough and
it will make it lossy compared to good base loading.
If I had a 60ft radiator I would put on top loading
to get it resonant on lets say 2.6 MHz. Then I would
feed it for 160 with a LC network and with as much Q
as possible, on 80 only a capacitor in series would
be needed, probably around 300-350 pF. Then I would
put out as many radials as possible.
73 Jim SM2EKM
---------------------
atrampler@att.net wrote:
> OK...slightly off-topic...so perhaps reply off-list.
>
> My summer project for a small lot is an 80/160 vertical, using linear loading
> on 160. Think the G0BZF 40/80 vertical.
>
> Initial plan is for 60' radiator, probably 2" OD the whole way to support the
> insulators to hold the linear loading (though that really only needs to be up
> to about 40') and having some top loading, perhaps 10' wires on each of the
> four top guys.
>
> Obviously I'll need some capacitance on 80. Not sure if I'll manually or
> remote switch the linear loading in and out.
>
> My main questions surround materials...do I need 1/8" or .104" all the way
> (splicec with tubing inside) or am I better off with thin wall tubing? My
> thought is heavier wall as I will be putting the insulators on it. Also, I
> would like some idea of the capacitance or range I'll likely need on 80, and
> the resonant frequency of the vertical as described without linear loading
> (to calculate that piece).
>
> Again, since this is not a tower per se, please reply to atrampler@att.net.
>
> Thanks,
> Art, K0RO
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