NAVAL ELECTRONICS TO4F-21 Splitter 100 KHZ-1000 MHZ NAVAL ELECTRONICS TO4F-21. NAVAL ELECTRONICS AB. FREQUENCY RANGE: 100 KHZ-1000 MHZ. They are used strictly for identification purposes only. We are here to help. Whether you need spare parts, machines, or custom solutions, we are here to help. byJuly 5, 2026