This is a complete chain power amplifier at 432 MHZ ( but also wide band from 400 / 900 Mhz ) and you can use with your SDR RTX device becouse for a full 300 W CW power output you need a signal input of - 4 dBm, so a very low level.
Can be used in all mode FM - CW - SSB - DIGI MODE EME and shure DATV, at 150 W out DATV COFDM the shoulder are at -32 dB, so really its a very low IMD device, the same with 2 tone in SSB also better.
So the final gain for 300 W CW out is about 59 dB with the full chain.
It need 24 VCC 4A for the low level stage, and 42 Vcc about 15A for the two final mosfet, they work also at reduced Vcc like 32 V.
It has inside a couple of BLF878 like final mosfet, a couple of MRF9030L like driver and a MMIC like predriver RFHIC model RFC1 G22-24, all these components are professional device and very expensive to buy.
Please, if you are outside EU COMMUNITY ask for shipping rate, its very heavy.
TNX de IK2DED Giulio