First a Italian guy did it, now the Polish guys did it too! It all started when someone wanted to transmit the Nikon Creative Lighting System (CLS) Advanced Wireless Lighting (AWL) signals via RF waves, just like the RadioPopper PX system, using cheap Phottix brand wireless flash trigger. After some extensive collabration over the discussion thread (Google translation to English), it finally worked.
Those guys have been going through my articles about the Nikon CLS AWL protocols for a while. I am glad some of the information might have helped them figuring it out.
As far as I can tell, it is basically an analog IR over RF transmitter. The IR signal from the master flash is converted by the photo diode into electrical signal and it is sent via a 433MHz RF circuit that is part of the Phottix transmitter. The RF receiver of the original Phottix receiver is used to receive the signal and convert it back to light pulses with a LED. The circuit boards in the original Phottix transmitter and receivers were used but the signal encoding part (micro controller) is skipped. Essentially, an analog RF infrared signal extender. The following is the complete circuit schematic.
You can check out this post for more pictures of the setup and test results. It worked with the master in M, TTL, or “–” (off) mode.
Lots of other eBay triggers have similar circuits that can potentially be modified to function as DIY RadioPoppers. RadioPopper guys may start to feel nervous about losing some businesses.
Keywords: CLS, Flash Triggers, Nikon, RadioPopper