I wanted to answer all your post one by one, but mine's could be too large, so I will write a general answer here for all without quotes.
The transmitter, like the receiver is fully integrated, RF on one end, SPI on the other, so one would need to instrument one or the other to gain insight into the over-the-air protocol. Neither is a trivial task, but both should be possible.
The datasheet says that chip is SPI - so put a logic analyser on the the SPI bus?
The alternative requires high-end RF lab equipment with demodulation capabilities...
I don't have any logic analyzer right now, maybe I should buy one, but I'm not sure about that.
My guess - you want to capture transmitted signal by arduino, make arduino as receiver ???
(GDO 1) and GDO 2 = demodulated pulses from where you can take them to arduino.
Yes, I want my arduino as a receiver.
Download Visual Analyser to your PC, you may see something.
Make a wire loop 5 cm diameter, the ends of the loop to microphone PC plug, transmitter inside of the loop.
A simple 433 MHz receiver, combined with Audacity on a laptop, might work to intercept and decode the RF signal.
However, the method in described in the tutorial will work only if the transmitter chip is using the OOK method of data encoding, rather than FSK or GFSK.
I tried with a simple 433MHz receiver without Audacity, only looking at arduinos IDE's serial monitor, and I only saw noise, nothing happened when I pressed the switch. I was thinking on use audacity (I have already seen that rayshobby tutorial, thanks ), but my question is, if I didn't see any change in the serial monitor, will I see anything with audacity? If I can't see anything, maybe the transmiter is not using the OOK method, as you said @jremington....
One of the more interesting things about this device is the battery-free remote. The cnx article has a broken link to a Coilcraft page, but I did find this general article on energy harvesting techniques.
Agreed! Looks like a simple moving magnet + coil generator. However, my automobile key is coin battery operated and has worked for 13 years of daily use without a change of batteries.
Yep, I found this wireless switches without batteries, and the energy harvesting in general, very interesting.