I have received many suggestions and ideas on this subject.
Finding a single RX antenna system that nulls the neighbor noise sources
at 90 and 270 degrees is proving to be a challenge.
Greg has offered an interesting idea that would integrate noise
canceling/nulling technology with a traditional RX receive antenna
system. Possibly providing a "best of both worlds" solution. I want to
share this idea with this group to see if others have any experience
with this proposed solution.
I could place a "noise antenna" next to each neighbor, mix the
equal-length feed lines together ( in phase ) for the noise source null,
and then place the actual receive antenna (in-line verticals, loops,
K9AY or Shared Apex ) right in the very center of my yard (
centered/equidistant from the noise antennas ).
Has anyone used multiple noise antennas feeding a single noise canceling
device?
Has anyone cascaded/combined a noise canceling device such as the NCC-1
or MFJ-1026 with a traditional short RX vertical(s) array or loop(s) or
K9AY or Shared Apex?
Thank you and 73
Lloyd - N9LB
On Tue, Jan 6, 2015 at 10:55 AM, Greg Chartrand via Topband wrote:
Looking for 160m narrow beam RX advice (Lloyd Berg - N9LB)
I had a similar situation about 15 years ago with my next door
neighbor who had something in his house that was giving me S9 raspy
noise 24x7. I could not find the source in his house but I suspected
his doorbell transformer that was buried inside a wall of his house.
The noise precluded all DX on 160 not to mention everything else.
I purchased an MFJ-1026 and had a sense antenna directly between my
vertical (receiving antenna) and his house. I was able to completely
null out the noise from his house right down to atmospherics. I worked
a lot of DX using the 1026 and about 4 years later the noise went away
without explanation.
You can put up flags, loops, pennants... whatever but none of them
will have a null anywhere near what you can do with a 1026 and sense
antenna .... assuming that the noise source appears as a single point.
You can verify this using a portable AM radio and using the loop-stick
antenna in it to null the noise. If it nulls well, the 1026 would be a
good investment.
Good luck!Greg
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