For what it's worth, that seems to be the standard way to distribute analog video (composite or component). A low-impedance voltage source with a gain of 2 drives a bunch of outputs with an individual 75 ohm series resistor for each output. Each cable that is connected to an output has a parallel 75 ohm terminator at the far end. Inputs are all high impedance. The result is cables properly terminated at both ends (no reflections), unity gain overall (the driver gain of 2 compensates for the 2:1 voltage divider due to the terminators, and the ability to daisy-chain through several inputs.
- Dave On Tue, May 15, 2012 at 6:02 PM, Hal Murray <hmur...@megapathdsl.net> wrote: > > It's not uncommon to use both source/series and end/parallel terminations. > The series terminator drops the signal level by 2 but minimizes > reflections if you are working in a less than ideal setup. It also > provides a current limit on the driver in case something gets shorted. > > > -- > These are my opinions. I hate spam. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
