Mark,
I had the same problem about 2 years ago on 40m. I ultimately tracked it
down by walking up and down the street with the FLEX-1500 powered by a
gel cell, my laptop, and a 3' diameter magnetic loop tuned to the area
of 40m visited by the 'hump'. The loop has an extremely sharp null
perpendicular to the plane of the loop, so it made it easy to locate the
source quickly.
The source ended up being a power supply in a neighbor's desktop
computer, located about 300 feet away. I begged him to let me buy him a
high quality replacement power supply, and said that I'd install it for
him. He kindly accepted my offer, and the issue was resolved. The
offending power supply was reduced to about 10% of it's original height,
to assure that it could never be returned to service by anyone who may
have pulled it from the trash.
Good luck w/ your investigations.
73, Dale
WA8SRA
On 2/20/2013 1:19 PM, Mark Lunday wrote:
Additional data - when I disconnect the antenna input, all is quiet.
On the hex beam, the noise is more pronounced when pointing west.
When I switch to the dipole that is running E/W and broadside N/S, the noise
drops by 10 dBm.
The HiZ 4 square receiving array has more noise when pointing NW directions
and is lowest when pointed SE.
Unfortunately, there are no houses within 500 feet to NW. There ARE high
voltage power lines, but that does not make sense to have a point source
when the lines run from NW to N and NE of the house.
Mark Lunday, WD4ELG
Greensboro, NC FM06be
wd4...@arrl.net
http://wd4elg.blogspot.com
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