[ARC5] Band noise (Was dynos and receivers)

[Dennis Monticelli]

Once upon a time I had the good fortune to vacation on a small Fijian
island.  I secured a license (FO0MOD), brought along a 20M dipole, a
slingshot with fishing line, and a small rig.  The noise on that island was
zero and I mean ZERO.  You could hear the thermal noise from a 50 ohm
resistor.  I checked into a DX net (everybody wanted to talk to me) and
could hear all continents simultaneously.  If the meter read S0 on the
signal I still had Q5 copy.  Once back home in the urban noise pit, reality
just slapped me across the face.

Dennis AE6C


On Mon, Jun 10, 2013 at 8:11 AM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:

> On 9 Jun 2013 at 22:55, Dennis Monticelli wrote:
>
> >
> > I have the Timewave. I tried it before the loop. It only works well if
> your noise source is local and
> > the "noise antenna" close to that source. Under those circumstances one
> antenna has a good
> > S/N (your regular aerial) while the noise antenna has a good N/S. The
> high differentiation allows
> > the magnitude/phase cancellation to be effective. The other issue is
> that the phase cancellation
> > depends upon a stable noise source. If it drifts in frequency as most
> switching supplies, do, then
> > the phase changes as well and you will find yourself trying to track it
> manually. Further if you have
> > more than one major noise source it will be unlikely that the noise
> antenna could be placed in
> > proximity to both simultaneously.
> >
> > Been there,...done that. It helps if your noise situation is
> straightforward.
>
> Rats! I was thinking of getting an ANC-4, but from the sound of things it
> would be only
> marginally helpful in my case.
>
> I guess the only real solution is to move to some place at least 100 miles
> from the nearest
> power line and run the entire house off batteries.
>
> The outback of Australia might be a good place...or possibly the middle of
> the Pacific Ocean
> somewhere.
>
> Poop! :-(
>
> Ken W7EKB
>