Just got my markertek package and this is the ideal AES/EBU to SP/DIF set up:
2 items:
1. Canare BCJ-XJ-TRA impedance tranformer $25.83:
(image slightly differs from product I bought; TRB instead of TRA)
2. RCA female to BND male adaptor $1.99:
The RCA to BNC clips perfectly onto the tranformer, giving you RCA out of instead of BNC. This allows you to just use existing coaxial cables to come out of the transformer. No need to make BNC to RCA cables with this set-up. Your getting the proper voltage changes! Handles 24 or 16 bit signals perfectly. Not too bad!