On 13/04/2017 14:59, DK7FC wrote:
...you may ask the neighbours to place a wire antenna close to their
house, picking up strong E fields :-) These signals fed to a JFET
source follower, then use a transformer somewhere in your RX chain and
add some turns on this transformer (0/180 deg switchable) for the
compensation from the noise pick up antenna.
That sounds feasible for a single source location. Unfortunately I think
there are at least four sources locally of what we see up to 7kHz plus.
I definitely know the source of the strongest band of QRM that covers
from 1.5 to 4kHz it can be seen (white) along with at least one other
which are similar on my wide spectrogram. Today it started with its
normal spike just after 06:00, normally it would go off at 16:00 to
17:00. It is my neighbour to the north, the QRM follows his working
days. No need for permission for a sense antenna I have a mast screwed
to his office wall :-)
Another experiment for when I have some spare time :-)
73 Eddie G3ZJO
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