text: Today, 05:27 AM #31
  (a) The USB-UIRT (my go-to device); this despite (i) the suggestion that the FTDI FT232R chip in it (it might be any of FTDI FT232RL, FTDI FT232BM) might be responsible for missing keypresses [I wrote to Jon Rhees but am not expecting a reply] and (ii) The suggestion that the thing was very susceptible to EMF. Case 1; Case 2. I put ferrite beads on both the main wire and the additional transmitter wire, both ends. The small transmitter is stuck on the STB sensor, the main device is well away from it to prevent doubling up. Yes I could use Zones (Z1, Z2,..) to isolate the transmitter but I like to see the red light flash on the main unit ... I also uncoiled my neat coiled up wiring to ensure I wasn't creating a little amplified magnetic field and re-routed the cables away from transformers etc..
  Ensuring the transmitter was directed at the sensor, with the right power; I had the USBUIRT blasting full-tilt but went for the small stick-on transmitter in the end.
  (b) uutx.exe, the native app for the usbuirt [caused EventViewer crash so had to give up on it despite being a nice utility].