I have already tried something similar.
-Ran camera dvr out into modulator-modulator out into spliter/cominber in.
-Ran cable into splitter/combiner in
-cable tv works as normal, but on channel 65 from modulator i see nothing.
Would purchasing a video distribution amplifier and connecting the dvr to it and then the outputs from that going into my tvs with an rca adapter do anything? I have read this on several post.s