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Here is a quick recording of the 80 metre noise on the FT1000MP and doublet antenna.
The problem is the same whether using my doublet or the Wellbrook loop receive antenna. Its not coming from this QTH as I have turned off the mains supply to the house and the noise is just as bad using my FT857 on a 12 volt battery supply. I really need to try and find the source of this interference!