[TowerTalk] 80/160 vertical

[Jan Erik Holm]

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
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atrampler at 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 at att.net.
> 
> Thanks,
> Art, K0RO
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