Double checked that there were pins in all the expected connector holes for the GNX. The pins looked good, but I discovered I had installed one connector upside down and corrected the problem. Decided not to power up the GNX without antennas before confirming nothing would be damaged by doing that. Ordered some low cost cables from Amazon to use for testing if needed. Reviewed all the connections to the GTR200 and GMC507 and decided how to route the cables. Estimated GTR wire lengths again now that I know more about wire routing.