The Sailor N420 (often manufactured by S.P. Radio A/S or Cobham/Thrane & Thrane) is a high-performance 24V DC to 12V DC Regulator/Converter. It is a staple in maritime communication, primarily used to provide a stabilized power supply to VHF radiotelephones (like the Sailor RT2047 or RT2048) from the vessel’s 24V battery system.

The N420 is a linear serial regulator known for its excellent noise performance, which is critical for sensitive radio equipment to prevent “hum” or interference during transmission and reception.

• Operation: It takes the fluctuating voltage of a 24V ship battery and drops it down to a steady 13.2V.

• Cooling: It features a robust aluminum heat sink design to dissipate heat, as linear regulation naturally generates warmth.

• Remote Control: It includes a dedicated On/Off terminal. When this terminal is connected to the negative (-) terminal, the regulator stays on; when disconnected, it shuts down, allowing for remote power management from the bridge.