|Three WSPR transmission just after my sunset (2 watts ERP)|
But the heat sink is installed onto the final FETs (or is it the other way around?). Also, the G0UPL GPS receiver has been moved from the other Ultimate 3S (the one used mainly for HF bands) and I was able to put the combo on the air as it lay spread out on my bench. Power out of the amp is controlled via the supply voltage - 12 to 30 volts DC input produces 30 to 300 watts RF output. With my power supply dialed up to its maximum of 14 volts, I'm getting 40 watts out for an ERP of about 2 watts.