Mike wrote: > Control boxes for the AN/ARC-1 and AN/ARC-4, and for that matter on the > AN/ARC-3 and AN/ARC-5 (VHF) were numerically marked. Oops! I screwed that up. The AN/ARC-5 VHF channels were marked A through D. I should have looked at my C-30/ARC-5. Mike / KK5F