I purchased a carryout g3 for my 2003 motorhome . I am having trouble hooking my home dtv hr54 receiver to the unit. I purchased a swm8 and power insert but I can't get a picture. The tv is a 2003 rca with only a coax and several rca ports front and rear. The hr54 has a hdmi port. What else do I need to complete setup. I can't replace the tv at this point. Any help would be greatly appreciated