Matt lent me his oscilloscope, after a bit of fiddling around I’ve recorded both what I’m transmitting and what I’m receiving on the other end. This is using Z6900 transmitter and a Z6905 receiver. That’s hooked up to an AVR transmitting the bit pattern 0101010 1110011 1000011 at 976.5Hz. The receiver data out pin is connected to ground via an 8K resistor.
Transmitted data: (CSV)
Received data: (CSV)
You can see something odd is going on. I don’t know where that noise just before the message is coming from; it’s not present on the transmission end, and it’s not present after the message ends. Anyone got any clues? I’m a bit stumped. You can clearly see the transmitted signal in the received data, it’s just with that horrible crap sprayed over the start of it. Would putting an appropriate cap in as a filter be a decent fix?
(Sorry the screenshots from the scope have different scales, the software is a bit fiddly to use and I’m not sure how to turn fix the scale.)