Output power: 1W on low setting, 3 to 5W on high
Gain: ADF can supply 13dBm. See diagram below.
Linearity: we don't care about linearity. You got it right.
Stability, technology: See diagram below.
Supply: 7.4V from Li-Ion.
Regulatory: glad to be in a place, where we don't have to care about FCC
hehe. We are going to measure that. We use a basic LC pi-topology filter, see the schematic for details.