[CQ-Contest] ANC-4 Noise Cancelling box

[N6KI Dennis Vernacchia]

Mike,

    I was successful with nulling out a single noise source of a quarry 
in a canyon behind my house.
To not have to deal with teh annoying T/R relay in the unit and since 
all my rigs have or have
been modified to have a separate receive antenna port, my ANC-4 is always in
the receive path only. This way on CW I can run QSK too,
which the ANC-4 can not even begin to deal with

I am using an outside reference antenna  source close to the quarry's 
noise source.

73, Dennis N6KI

W0MU Mike Fatchett wrote:
> 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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