When a DTC100 is connected to a Mit xx805 or 905.

On the Mitsubishi input #1 is the HDTV input
from the 5 BNC inputs on the back panel. These are
the HDTV from the DTC 100.

If you are not using the HDTV function of the DTC
100. Normally you be connected to the input #2
of the Mits.

Therefore if I am watch regular TV or DTV on input
#2 and I push the HDTV button on the DTC100, my scren
goes blank untill I go to input #1.

Also the Mitsubishi powers up to input #1.

You also may notice that each HDTV signal may produce
a slightly different picture depending on how they
are upconverting.

Alfred Egan