I have a satellite decoder that has rca outputs, andneed to connect it to a 13 channel drake matrix box that has 13 cards that allow you to assign a channel number on each card. the cards have a coax connector for video input, two rca connectors for audio, and a coax for rf out. I am using a series of coax connecting hardware to adapt the yellow rca plug to connect to the matrix video in from the decoder video out. apparently there is signal loss since the video is black and white after this conversion. any suggestions on how to accomplish the conversion from rca to coax video ?