con't

on antenna spacing : any spacing at all works for cancelling,
but the gain of the resulting system for things you _do_ want
to hear is reduced if they're separated by less than a quarter wave.

That reduction may be of no importance whatever, however, with
modern sensitivities and low internal noise receivers. Try any
separation you have room for. On MW you can rarely get a quarter
wave but it works fine nevertheless.
--
Ron Hardin


On the internet, nobody knows you're a jerk.

Howdy Ron:

Have you written up that phased array of yours? I've been reading your
comments about it for quite awhile and you seem to be quite proud of your
antenna (as you should be). It seems just the ticket for an article in PC,
MT, CQ or perhaps QST.

I've been wanting to set up a shortened beverage array with the noise
canceller as per Vic Misek, W1WCR "Beverage Antenna Handbook" I think it
should work out quite well with his Steering Wave Array. If you don't have
a copy of his book I think you would find it interesting and become a
worthwhile addition to your collection of references.

Sincerely,
RG

Ron Hardin wrote:

Well of course hunting down mystery noise is fun too. But for
noise cancellers, the Timewave ANC-4 works great (formerly JPS ANC-4).

The best arrangement is use two external antennas, arbitrarily
connecting one to the ``noise antenna'' and the other to the
``main antenna.''

That gives you a two-element phased array, and you simply steer
its null over your noise source, and it's magically gone. This
is actually something of an entertainment itself.

You _might_ get by with the onboard noise antenna but that's more
speculative. It depends on how well indoor noise copies what the
outdoor antenna is hearing. Two real antennas always works better.

I myself have found this amusing enough to build an 8-element
phased array with 7 ANC-4's. Talk about versatile! I can
null two stations and hear a weaker third under them, with some
diddling, and have half the array left over.

The ANC-4 works down to MW and below, which the MFJ version does not.
MW is the most entertaining place of entertaining places to do
nulling and digging out.

Incidentally, for nulling distant stations, it doesn't work for SW
because the variability of direction of arrival with skip is bigger
than the size of the null you're steering; it works on MW though,
and at any frequency for local sources (ie with a stable direction)
like your noise source.
--
Ron Hardin

There were plans in past issues of Monitoring Times and QST for a
homebrew version of the ANC-4.


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"starman" wrote in message
...

There were plans in past issues of Monitoring Times and QST for a
homebrew version of the ANC-4.

I've got that article stashed someplace, didn't look real complicated. I
think Far Circuits ( /www.farcircuits.net/ ) has the circuit boards for the
project and they will also supply a copy of the article for an extra buck or
two. RM~

Rob Mills wrote:

"starman" wrote in message
...

There were plans in past issues of Monitoring Times and QST for a
homebrew version of the ANC-4.

I've got that article stashed someplace, didn't look real complicated. I
think Far Circuits ( /www.farcircuits.net/ ) has the circuit boards for the
project and they will also supply a copy of the article for an extra buck or
two. RM~

BTW- You can elliminate one of the control pots' in the design if you
wind the associated coil with a bifilar winding.


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