[ARC5] Band noise (Was dynos and receivers)

[brianclarke01 at optusnet.com.au]

	Hello Ken, 

	Outback Australia is good. Unfortunately, compared with the city,
the cost of living goes up when you want to go shopping. And motor
fuel shops get further apart - running out of fuel is a certain recipe
for death by heart failure / dehydration. 

	There are places much closer and less hazardous than the outback -
even just down the road a wee way. Most mains-borne noise falls off as
the square or the cube of the distance from the noise source. Even
burying the power lines, so beloved of the weenie-greenies, does not
attenuate the noise that much (except from the weenies); the
permeability of earth-like material and concrete is not sufficient to
shield from mains frequencies. So, set up your preferred
remotely-controllable receiver on a distant mountain top and
communicate with it via your own private line or use a LOS link at say
5.6 GHz. A software-defined radio as a plug-in board for a junker
computer is a good basis for your remotely-controllable receiver. 

	Just a thought ... This idea is not new - I saw it first in Wayne
Green's _73 Amateur Radio Today_ at least 15 years ago. What is new is
the proliferation of cheap boards and software. 

	73 de Brian, VK2GCE.

----- Original Message -----
 From:"Ken Gordon" 
To:"Dennis Monticelli" , "ARC-5 List" 
Cc:
Sent:Mon, 10 Jun 2013 15:11:03 -0000
Subject:Re: [ARC5] Band noise (Was dynos and receivers)

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
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