There are a couple of interesting Navy sets. MAH is a RT19/ARC-4 SCR-608 is a AN/MRC-5 TCS is a AN/MRC-6.......Mark, TCS was part of MRC-6, I have a manual some place. SCR-508 is a AN/MRC-7 SCR-528 is a AN/MRC-8 Regards, Mark Tombleson EdZ