Bad modulation reports

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 So I was out once more with the FT-847 and made a contact with EW1MM but his report was bad. 54, if I remember correctly and he mentioned that there's something wrong with my modulation. I spent the next three days testing with the help of my wife in freezing cold and got nothing. At least on 2M and 6M all AM, FM and SSB works fine. I need to test the HF side but that will have to wait until she gets her own license so that we can successfully transmit both sides and compare. 

I have no idea how to debug this at home since the radios interfere way too much in SSB/AM.



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