[ARC5] Band noise (Was dynos and receivers)

[Leslie Smith]

  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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