Hi Charlie, This was posted about a week ago and should explain what is going on at the moment with your 6300. Hope it helps for now.
A few FLEX-6300 customers have mentioned that output power on CW is lower than the output power on SSB. We have looked at several different radios and found that the power offset is typically 0.3 - 0.7dB lower with CW due to the different path that RF takes through the radio when operating QSK. At most, this amounts to a roughly an 85W output when set to 100W (your mileage will vary). 15W difference sounds like a lot, but to keep this in perspective, an S-Unit is 6dB so this is only 1/10th of an S-Unit difference for a receiving station! Nevertheless, we want to account for the difference so the radio is a full 100W output on CW as well.
When the radio was designed, it was assumed that there would not be an offset in the paths so the calibration difference was not accounted for along with the myriad of other calibrations in the radio (board losses, filter losses, PA gain variance, etc.). It may be interesting to note that the difference is not a power loss (it is not power dissipated in the radio), but is a generation offset (less power is produced). As a result of this discovery, we have updated the calibration algorithm which will offset the power for CW to overcome the difference. The change has already been coded and tested and we will be releasing this as a point release software update in the next several weeks (this along with other fixes will first be tested by the Alpha team, etc).
Steve - N5AC, VP Engineering
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Posted 1 week ago
Also, I believe that the correct way to set the radio for maximum power is to active the Tune button and then drag the RF Power slider to 100%.
13.8V on receive is not a good measure of your transmit power voltage.
Your voltage on Transmit is important because with the higher XMT current draw any resistance means a voltage drop and less power
How is your wattmeter calibrated
Finally there was a bug in the power output of the 6300 that will be corrected in 1.4 Point release.