I tried to wire in to the transmitter - it sends same sound as the RF reciever gets, just much more quiet.
I'll be trying to pin to it now as it gives lower voltage. I couldnt get voltage divider to work, i get very noisy sound.
I managed to record one "test" button before my ears exploded ;-)) it's in attachment.
If you somehow manage to get code working for it (so i can harvest data from sensor), we might start debugging.
http://dl.dropbox.com/u/619007/rf_oneread.wav - but it sounds corrupted near the one below.
Yep, managed to get few "normal" reads without the "transmit" button. It seems like it's send every minute.
https://dl.dropbox.com/u/619007/few_reads_around24c_23wh_ch2.zip
temperature (i couldnt see the lcd while holding cable) was around 24.xC, humidity 23% and it was sent on second channel (and sensor have 1-2-3 CH option).
I didnt cut or modify the file - it's straight from audacity.
I hope it helps to get the "header" pulse for sketch...
I played it back slowed down few times - it sounds liek it sends 6 "pulses" every time. So it's like 6 (same?) messages for weather station, very near to each other.