[Elecraft] Rx/tx offset

[k1xx at k1xx.com]

Sorry folks but bw limited now so can't search archives for possible answer.  
A couple friends that know my voice claim there's a small offset when we tune each other for natural sounding voices.  We're all using K3s.  The difference appears to be on the order of 20'ish Hertz.  
I seem to recall some brief mention of a small tx/rx split when the new synthesizers were announced.  However, I don't recall this kind of shift being mentioned again.  XIT/RIT are off.

Thoughts?

73 charlie. VP2MLL/K1XX
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Sent from dumb Android phone.