NHJ/KC4 - Who is?

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NHJ/KC4 - Who is?

Hello people, now in 20m band decoding a station NHJ/KC4 which does not seem to be a valid amateur callsign, jumping in frequency between time intervals and without grid locator, sometimes with good signals. Does anyone knows who is it?? Thanks, Andres LU3HO.

PS: the program seems to not upload that decodings, so it is not in the database.