You can do that now if you're using an SPE Expert Amp. I'm not sure about any other amps doing it. I got it working here after reading the forum post by N2RJ:
Ria - N2RJ, Elmer
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You can use DDUtil, that is one option.
You
can also use the USB cables and have the amp control drive power. I
prefer this method because it supports the two inputs for SO2R. DDUtil
will only send band data for the current transmit slice so you're really
limited to only one output from the radio. I don't know if this has
changed but last I checked this is how it was.
Basically you get
an FTDI adapter or make a 9 pin to 15 pin cable according to the SPE
manual. Get two if you're using the two inputs.
Use only the Relay line. Do not use ALC.
Configure your USB ports to CAT mode, and set it to follow the antenna port.
Then set the amp to FLEX mode.
Adjust
drive power using the arrow keys on the front of the amp. You must set
it once per band and once per power level (Mid/Max/Low). The front of
the amp will display "PC=XX" which is the drive power level. Adjust
using a dummy load to set desired power. I believe 1500w for Max, 1kw
for Mid, and 500W for low. This is a one time thing. When you change
bands, the amp will automatically set power in SmartSDR.
HTH
