Connect the RF (or RCA) output of the converter box to the input of your DMR-E75V, then connect the output of your DMR-E75V to your TV. You'll be using the converter's tuner instead of the DMR-E75V so you won't be able to change the channel with the E75V remote control like Tony mentioned.
It's one of the blips about the transition, older VCRs and
DVR recorders just can't change the channel on the converter boxes tuner.