Hi Matthew,

There are two important points about using those little 433MHz links

When the receiver is not receiving a bona fide signal its AGC is turned
right up for signal detection and that's what causes the random digital
noise on the output

Transmitting data to the receiver is best done using Manchester coding,
which is a balanced signal and also self-clocking

https://en.wikipedia.org/wiki/Manchester_code

Recovered data bit rate is half the baud rate because of the 01 and 10
representations

Sending "normal" bytes of data can cause the receiver's output to lurch
all over the place because of the probable unbalanced DC, eg a string
of 0s or 1s that will likely be found in data bytes

A reliable link is established initially by sending a pre-amble of somethin=
g
like a couple of bytes of 01010101, which turns the AGC down, lets the
receiver settle and allows the decoder to determine the baud rate by edge
detection or bit length measurement, followed by data, which might include
an ID byte or bytes to identify the transmitter, as you would on an I2C bus=
s

Until you've established a verified link just ignore the output noise

Joe=20



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