[ARC5] Band noise (Was dynos and receivers)

[Dennis Monticelli]

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.

Dennis AE6C


On Sun, Jun 9, 2013 at 10:17 PM, Bob Macklin <macklinbob at gmail.com> wrote:

> The Timewave unit is the ANC-4. I have on and it does work.
>
> But it does not make signals where there are no signals.
>
> There are RBNs at Vancouver, BC, about 30 miles south of Seattle, Eureka,
> Ca, and several in the SF Bay Area. None seen so show any 80M activity at
> night.
>
> There are also several in the So Cal area.
>
> Bob Macklin
> K5MYJ
> Seattle, Wa.
> "Real Radios Glow In The Dark"
> ----- Original Message ----- From: "Kenneth G. Gordon" <
> kgordon2006 at frontier.com>
> To: "Dennis Monticelli" <dennis.monticelli at gmail.com>; "ARC-5 List" <
> arc5 at mailman.qth.net>
> Sent: Sunday, June 09, 2013 9:48 PM
> Subject: Re: [ARC5] Band noise (Was dynos and receivers)
>
>
>  On 9 Jun 2013 at 21:22, Dennis Monticelli wrote:
>>
>>
>>> I have similar issues on 160 and 80M. I tried a well-constructed &
>>> designed loop called the Pixel
>>> loop (you can look it up). It works well, but it is not the complete
>>> answer. You will pick up less of
>>> the near E field and you will have nulling capability...but....my
>>> neighborhood has many sources of
>>> noise. A loop can null a single point source but not a bunch of sources
>>> coming from random
>>> directions nor is the null very deep if the noise is a line source.
>>>
>>> Dennis AE6C
>>>
>>
>> There is a "noise canceller" made and sold by TimeWave that works
>> extremely well for
>> repetitive type noises, like power-line crap. It won't do much for random
>> junk though.
>>
>> MFJ makes one too, but from the videos I have seen of it working on
>> youtube, it is somewhat
>> "iffy".
>>
>> Both work on a phasing principle and both need an external "noise"
>> antenna.
>>
>> Ken W7EKB
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