I finaly got around to cleaning track and wheels and pickups. Nothing has helped. I have multiple engines and they all do the same thing on all outputs of the TIU.
I decided to get my oscilloscope out to see what's happening with the signal.
First I connected the scope to the remote tether jack to monitor it while the communication to the TIU was the normal wireless way. I set the scope so I could see a small pulse when the remote sent out a REVERSE OR BELL command. The result was that when my remote is unresponsive, there are multiple pulses going out. Once the pulses stop and the engine responds, the remote is free again. If the engine never responds, the pulses stop after awhile. When the engine responded right away, there was only one pulse sent out for the BELL OR REVERSE button. So now I know why my remote is sluggish.
Next I put the scope on the track. The TIU was powered by the AUX jack. Track power was put on variable 2 input, but I left the output off. With no engine on the track, I saw a 5.2V p-p signal on two large pulses and two smaller pulses.
Next I did the same with my engine on the track. The result was two large pulses at 2.8v p-p and two lower voltage pulses.
Does anyone know if this is an acceptable signal level?
If not, what should it be and what component do you think might be causing low output in the TIU revision H?