Sending/receiving data using Linx modules

[dhouston]

I'll second what Bill wrote. Most AM receivers output a constant stream of noise in the absence of a strong signal. Their AGC circuits amplify the low level noise so it tends to be rail-to-rail. You can see some o'scope screenshots here...

• http://davehouston.org/rf-noise.htm

You must use some sort of STX (start of transmission) marker to distinguish signal from the noise. The simplest approach is to just use a wide pulse as STX. It sets the receiver AGC level so that the noise is suppressed and you can distinguish what immediately follows.

• http://davehouston.org/RFTipsTricks.htm