> I plan on running the control wire up through the center of
> the vertical and it will peek out at the very top of the
> tubing and connect to the operating coil of the vacuum
> relay. In addition, I will be using decoupling methods to
> inhibit RF from coming down the control wire into the shack.
> This seems to be a very easy way of using this vertical on
> 2 bands. Does anyone see any problem with this?
Hmmm. I pondered trying this stunt on a slightly different design and
rejected the project for several reasons:
1) The voltages at the top of a resonant 80 vertical, at resonance, are
going to be almost impossible to manage--especially at 1KW or more. The
vacuum relay will most certainly be useless on 80 as a switching method.
Managing those voltages in an enclosure to protect stuff from the elements
will render the device an ozone generator.
2) Maintenance--you develop a problem during topband season (winter) and you
are down for a long time.
3) Isolating the control voltages may prove more difficult than at first
thought. Even with a large choke at the base of the vertical, ugly voltages
can develop along the length.
4) Refer to #2
5) Refer to #2
6) Refer to #2