The other is the full power version producing up to 900W output, mains powered. The diagram for the portable TX is below. The constuctional details are in the article 136tx.doc which can be downloaded below. Here's a picture of the portable version. I've managed to fit it in a case 125mm wide x 95mm high x 210mm deep .
Side view Typical driver board.
Download the article on the portable rig in Word2 format. The base station version Using high voltage mosfets means that the power supply for a kilowatt amplifier becomes a bit more manageable. With an 80V rail we need only 15A to get a kilowatt as the switching design is so efficient. More weight and heat saved. I have also added protection circuitry to cope with over current and mismatch, these refinements could be added to the portable version if desired, as the drive circuit is basically the same.