The KX3 is a true CW transceiver in that - unless you set it otherwise - it's dial frequency is the ZERO BEAT of the transmitted frequency. The rules for 60m say that CW must be center channel. SSB transmits UPWARD from zero beat on upper side band; hence the difference in dial setting.
Here is a chart with both center and dial frequencies.
CENTER(CW) DIAL (USB)
5332.0 kHz 5330.5 kHz Channel 1
5348.0 kHz 5346.5 kHz Channel 2
5358.5 kHz 5357.0 kHz Channel 3
5373.0 kHz 5371.5 kHz Channel 4
5405.0 kHz 5403.5 kHz Channel 5
Believe me, this can be a sticky question. Other rigs may just put the CW into the SSB mixer as a tone and that becomes messy, with dial setting +- side band -v- sidetone offset math and all that nonsense. I have many war stories about the radios with a 2,000Hz CW tone so that the freq of 5555KHz on their dial was actually 5557KHz on a station R-390A for zero beat. (Set R-390A BFO for the tone YOU want to receive). "You're off frequency!"...yet magically at sked time, there was our contact - go figger.
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Hey lieutenant, what's you job title?
"I'm the watch officer".
Then WATCH!"
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I agree - it's a pain and each manufacturer seems to use a different 'standard' as to where they place the carrier.
de RadioRay ..._ ._