Hello Again:
Stan noted "where guys need higher currents is in large-scale which is primarily a DC environment. This may be weak reasoning but does give some hope that passive mode DC on a variable channel is OK."
However on page 120 of Barry's 3rd Edition Companion, middle of page, there is the following:
"Since TIU Variable Channels operate by regulating voltage from transformers to the tracks, it is not possible to use Variable Channels when wired for Passive TIU Mode of Operation. Again, this is because track power does not pass through the TIU under Passive mode of operation."
I have to say, as a novice, I guess I do not understand the purpose of setting Variable channels to Fixed. My thought was using a Variable Channel as Fixed meant they replicated the function of normal Fixed Channels and, as I would be using using a fixed output at 18VDC from my power supplies, I do not need to vary the voltage.
So, my remaining question: Is there a method for using all four TIU channels as DCV sources for DCS MTH HO layout (using two power supplies)?
Doug
