No stereo from RF cable - DirecTV DVR

For No stereo from RF cable, relating to DirecTV DVRs and receivers. I have found that I do not get stereo sound from my receiver when using the RF output. I get proper stereo when using the component outputs, so the system works. I am routing to a 2nd TV with the RF. Yet, even when I try using the component output to a RF modulator, the stereo is lost.

I have tried with two different TV and multiple configurations. Any ideas?