So we're transmitting some bytes and looking at the receiver output. Note on the following that the interference persists past the first start symbol and into the actual byte symbols.
Changing the first start symbol to simply be five high units fixed this.
And we can see it takes a comparatively long time when the TX is close for the gain to rise again so that noise and interference is toggling the receiver output.
As a result the first start symbol was changed from LLHHH to a preamble of HHHHH.
It would have been better if I had solved the noise problem but so far it has eluded me.
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