You met my prototype in this post, where I promised that, once the commercial kit was ready, I would "post the complete schematic, in true open-source spirit".
Well - here it is...
As you see from the schematic, the shield hosts not just George's transmitter circuit but also a power supply (to derive 5V system power from the "12V" radio supply) and a flexible input buffer/amplifier arrangement, to allow the transmitter to operate with a range of RF signals (including - of course - those from the Kanga / m0xpd DDS Shield).
The transmitter puts out just under 2W - as I confirmed yesterday by sending WSPR signals on 30m which were received in Tasmania (again) and Venezuela!
There are complete design files (including an Eagle PCB design, suitable for single-layer construction - as in the prototype) on the "Occam's Micro" support page.
You can meet the new transmitter shield on the Kanga Products stand at Rishworth.
See you there!
...-.- de m0xpd