Trimmed the coax to length for the ADSB, Comm and transponder antennas. Installed two TNC right angle connectors and one BNC right angle connector to attach the coax cables to the main units on the subpanel. Tested all connections for shorts and found one cable that would not test ok. After much consternation, found that when the coax was connected to the antenna it would not test properly. Tested all cables unattached to their respective antenna and all tested ok. Soldering the connections proved to be challenging due to the tiny size and close quarters.