Hi all, I had a look to the schematic of KG-UVD1P and it looks easy to increase TX power. It is controlled by measuring the current consumption of the power amp and drive amp. The current is measured using a shunt made with the parallel of 4 resistor ( R615, R616, R659 and R660 ) of 0,39ohm (i.e.about 0.1ohm). One could deceive this measure by changing the resistor value ( for example put another resistor in parallel with them ). The power amp uses a 2SK3476 fet and according to spec. could stand up to 20W ( of course one should check the temperature and maybe put an heatsink ). Also should monitor the temperature of the pre drive stage ( uses a 2SK3475 3W max ) which is power controlled too.