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USB OK, LSB narrow/pinched TX audio


 

Good evening!
I have an FT-847 that I have had a good while and only used it on VHF (6 and 2 meters mostly, some satellite). The transmit audio sounds FB on upper sideband, but on lower, (75 meters) it sounds terrible.?
I have tried to see how to validate the carrier frequency for LSB, but not finding a setting or trimmer that affects the frequency in any way on either sideband.
Any suggestions?
Thanks
Victor

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