I have had an opportunity to play with one of these boxes and they work very
well *IF* you can get a sense antenna that hears the same noise that you
have. It should only be as long as needed to pick up the offending noise.
In my case I have a very noise power line to the NE only about 1000 ft from
my tower. The power company has been notified so hopefully this will not be
a prolonged experience.
I as able to erect a low dipole very close to the power line. It is about 3
ft off the ground. I started with a dipole that was 4 ft on each leg but
that did not have enough signal so I lengthened to about 14ft on both sides
and this worked much better.
I found the extendable antenna to work a bit but it picked up all sorts of
birdies and other shack noise. I also tried hooking up my R8 vertical as a
sense antenna but that was too much signal to handle.
The unit comes shipped with a relay delay set to slow which I found very
annoying as I had to hear about 2 seconds of the power line noise before the
unit would engage after transmitting. You can change this by moving a
jumper inside the unit.
Mike W0MU
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