Interesting to discover that the design appears to be an update of the 'Little Jim' transmitter which featured in issued 208 of Silicon Chip way back in January 2006. The component placement appears to be identical, but the original had what appears to be a home-brew PCB with a ground plane on the top side and the tracks on the underside, rather than the professional PTH screen printed PCB of the updated version.
A description and picture of the 'Little Jim' from issue 208 can be seen at the Silicon Chip legacy site here:
http://archive.siliconchip.com.au/cm...5/article.html
Neat!