Here in Alaska, we have frequent power outages. More often in winter
due to wind storms knocking down wires.
A few years ago we bought a 6500w Honda inverter generator to provide
emergency power. Its large enough to supply the entire house
load. One of the interesting things was noting the drop in radio
noise when power is off. We see no lights in the neighborhood other
than ours so any noise would be made in our house. 2m noise drop
almost to S0. Normal quiet times with commercial power runs
S3. Only see S2 or less on 2m when running our generator. At times
local noise on 2m rises to S7 which renders the band unusable except
strong local signals.
I just set up my 6m eme system and measured S6/7 noise with the ARR
preamp. PR6 shows S3/4. ARR gain is 25-dB vs about 15-dB for the
PR6, so I added a 10-dB attenuator in-line with the ARR preamp which
now matches the PR6 noise floor pretty well. ARR is closer to the
antenna with 0.5 dB NF whereas the PR6 is about 0.7 dB NF. Not
really noticeable with local signals but makes a little improvement
with weak eme signals.
When I first came to AK, I lived off the grid (about 2-3 miles from
nearest power lines (town of pop 75). 80m band was S0 on my dipole
at night. Really heard well back then. I now live 100 miles west of
there in a buried utility area (2 to 5 acre parcels) which probably
helps (though overhead lines are only 1/2 mile away. HF is typically
S5 noise with my K3 (preamp off). I use the PR6 on 10m & 6m so that
raises the noise floor a bit. Our pop is 4,000 spread over 76 square
miles with a city of 15,000 12 miles south.
Going to bush towns is no insurance for low noise. I worked in a
town 400 miles west of Anchorage (pop 3500) and tried setting up a
long yagi on 2m on roof above the TV station. Noise was over S9 (due
to arc igniters in their furnace). 2m was totally unusable (trying
for a long shot to Anchorage). They ran a monitor on the AM radio
station which blared horrible noise when they shut down the
transmitter at night.
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
dubus...@gmail.com
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