[Ronja] Twister1 not rx'ing

[Bruce M Simpson]

Hi,

It appears the Twister (v1, not v2) is not receiving the optical signal 
correctly..

There was a bad connection on the board to the red LED, caused by my 
being a bit too rough with handling it during build, which I've 
corrected using teflon coated wire. However this hasn't cured the problem...

So I've double confirmed that the receiver and transmitter modules work 
OK with the scope. The Twister transmits optically OK, I see the 1MHz 
idle pulse on the output.

I'm using Ondrej Tesar's SMD design for the RX module.

Hints? Tips? Where to start looking?
BMS