[amsat-bb] Re: Help with 75 mtr Qrn problem
phil_lor at bigpond.com
Fri Aug 2 22:25:49 PDT 2013
On 03/08/13 12:40, Greg D wrote:
> Hi Dave,
> If the noise came and went sharply (like someone turned something off
> for a week), and "man made" sounding, perhaps one of your neighbors put
> up a solar power array? Lots of diodes and the power inverter running
> during the day...
I sympathise with the original poster and have exactly the same problem;
20dB over S9, or worse, up to 21MHz.
My initial though was likewise that our 3KW solar system was the cause
and although it does add to the noise, switching it off barely makes a
difference. Our mains powered LED lighting also adds a little to the
noise, most noticeable at around 7MHz.
We live in a small town in the middle of nowhere and our closest
neighbours are 500 metres away. So that only leaves the overhead street
electricity cables and or the high tension cables that lead to the
switching yard some 2km from our house. We have underground cables from
the street to the house.
Whatever the cause, HF operation is out of the question at the moment.
If I can muster some enthusiasm I might investigate a loop aerial.
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