[Elecraft] PSK Power Output

[pastormg2 at verizon.net]

I have noticed today that when I am in Data A Mode and using either Hamradio Deluxe or Digipan that when I key the transmitter it take some time before it gets up to the power
that I have set for transmit. I have the power output set at 40 watts. When I key the K3 it starts at 25 watts on my meter and then goes up to 40 after about 10 seconds.  Maybe I never noticed this before, but I thought it just started to transmit at 40 and that was it.  I am currently using a signalink USB and of course when I adjust the TX knob that adjusts the power output.  Am I missing something or do I need to make an additional setting to get it to work right?  Any help would be much appreciated.  Mark KB3Z