Hi Bill,
> I do not operate AM mode but, in the AM mode on my IC-735, I have
> an "S" meter reading that is always around an "S9". On sideband, this
> "S9" becomes an "S4-5".
The "band noise" from the north has been very high lately. The
noise I hear is propagated noise, because I am in a rural area and
my antennas are a long distance from noise sources.
Sometimes the band is just "noisy" in some directions with a hiss.
It could be an accumulation of many thousands of noise sources
propagating in, or from some ionospheric source. I have no idea,
except it is not coherent noise. It is white noise.
Because it is a "smooth" noise, narrow filters reduce its level
without making it "ring out" like a raspy noise. I doubt what you
hear is from power lines, because unless the lines are DC they are
always modulated at 60 Hz or multiples of that. If it is a voltage
breakdown issue on a single phase line, the noise is generally 120
Hz (one pulse one each crest of a cycle).
When the band was open to Asia last night and this morning, I also
heard that "buzzing thing" that appears every few kHz. It was
discussed here a few months ago, and the conclusion was it is
from Asiatic Russia or something near there.
73, Tom W8JI
w8ji@contesting.com
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