[CQ-Contest] ANC-4 Noise Cancelling box

[W0MU Mike Fatchett]

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