Hello all! Forgive me if this has been asked - I searched around a bit and didn't find anything. Just for the heck of it, I'm trying to modulate a signal on channel 3 onto the same RG-6 as my MBR D12-300. I've got a single LNB dish, 4 port multiswitch, and am using JVI 35SDX100 diplexers. (power passing on one leg, 40-2150 Mhz) I can get the modulated signal to work fine, but it seems to block the satellite signal to the D12. Any idea what would cause this? If I can't get it to work it's no big deal, but I'd like to understand what it is that isn't working. Attached is a little schematic of what I'm doing. Thanks!