[ARC5] Band noise (Was dynos and receivers)

[Dennis Monticelli]

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


On Sun, Jun 9, 2013 at 2:25 PM, Leslie Smith <vk2bcu at operamail.com> wrote:

>   Ken,
>   You write "Band conditions are just awful.  Very few signals ... etc"
>
>   Here, on the East Coast of Australia there is little activity on 80m.
>   Some evenings - nothing.
>   40m is active during the day.  However, my topic is 80m.  I have a lot
>   of appliance-generated noise here, at my place.
>   Before I listen on 80 I must turn off my phone/fax machine, my printer
>   (HP 1120C) and some plug-pack power supplies.
>   In the past plug-packs were simply a transformer in a box.  Now they
>   hid switching supplies.
>   More ferrite means less iron and fewer turns of copper, and iron is
>   expensive.
>   Sometimes I can leave my PC and monitor on.
>
>   After these items I turn off the washing machine (it has a
>   microprocessor and switching power supply).
>   I don't have a TV set (I like reality, not perpetual fantasy), but
>   after I turn off all MY gear I hear my neighbor's TV set.
>
>   Poor band conditions (and appliance generated noise) are killing 160
>   and 80m.
>   (Maybe a frame aerial is the answer to noise.)
>
>
>   73 de Les Smith
>   vk2bcu at operamail.com
>
>
> On Sun, Jun 9, 2013, at 15:17, Kenneth G. Gordon wrote:
> > Tonight, I tested an R-25 receiver I have been working on here by
> > powering
> > it with a DM-34 dynamotor. I first cleaned then greased the dynamotor's
> > bearings with that grease that Mike Hanz recommended.
> >
> > I was using clip-leads to connect everything together with. At first,
> > there was
> > some minor "crackling" noticeable in the audio, but when I connected the
> > frame of the dynamotor to the chassis of the receiver with another
> > clip-lead,
> > the crackling disappeared.
> >
> > Interesting....
> >
> > Boy! Band conditions are just awful. Very few signals on any band but 40
> > and 20.
> >
> > Ken W7EKB
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