I’m interested in using the “RF Link 4800bps Receiver - 434MHz” (WRL-08950) RF receiver in conjunction with the “RF Link Transmitter - 434MHz” (WRL-08946) for a home project over perhaps 30 feet through a cinder block wall and drywall. I chose them for their simplicity and the fact that I was truly looking for a “cable replacement.”
I received a couple of samples today for test using a PSoC 29466. When I powered everything up. '08950 receiver’s data output was toggling at a furious rate as might be expected in a 434MHz-rich environment. Honestly, I wasn’t expecting that much racket in a typical suburban environment – maybe short bursts now and again but not the non-stop continuous output I’m seeing now. There’s no way I could send a 5 or 10-byte packet across this link; there’s simply zero “idle time”.
My power (5V) and ground look fine and the noise is there with a 17cm “antenna” wire there or not. It does seem worse with the antenna (which makes sense…)
I haven’t built the transmitter-side yet for my test but I was wondering: Does the receiver have any sort of AGC? If so, perhaps I could begin my transmission with a fairly wide “break” signal to allow the receiver AGC to throttle back. I’d follow the break with my message and repeat this once every second or so.
I looked at the datasheet for the module:
http://www.sparkfun.com/datasheets/Wire … RX3400.pdf
and for the RX3400-LF chip:
http://www.princeton.com.tw/downloadpro … 3400_3.pdf
and don’t see mention of gain control.
Before I waste time on building a TX, any tips on making use of the DATA output of the RX? Any tips from those who’ve actually used it?