I have built several of these RFI generators to use for practice and
thought I would document it.
If you are interested please see
http://www.w0qe.com/RF_Interference/simple_rfi_generator.html
This small battery powered device that can be built in an hour or so
produces S9+30dB noise at my QTH and can emulate the noise generation
mechanisms that occur in devices that cause interference. I recently
tried it by inductively coupling to the ground wire of some power poles
and it generates noise that can be heard for a thousand feet.
Additionally it shows how a purely differential current still produces
noise that in my home is only 7dB less than the common mode current due
to the terrible balance of the house wiring which causes some percentage
of the differential current to be converted to common mode current.
73,
Larry, W0QE
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|