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The 65801809-4 (or T-65801809-4) is an A.C. power supply printed circuit board (PCB) used in Sperry marine radar / transceiver systems (notably S-band, and related to VisionMaster / bridge radar equipment).
Its primary role is to take input AC power (from the ship’s electrical system) and convert / regulate it into the necessary DC and possibly high voltage outputs needed for the radar / transceiver electronics, including magnetron, control logic, and ancillary circuits.
It is a critical internal component in the radar / transceiver assembly, designed to supply stable, filtered power to high-voltage sections and low voltage circuits, while protecting from surges, overloads, and ensuring electrical isolation and robustness for the marine environment.
| Parameter | Likely / expected values or ranges | Notes / remarks |
|---|---|---|
| Input voltage | Single-phase AC or 3-phase AC (e.g. 110–220 V, 220–240 V, 50/60 Hz) | Matches common shipboard supplies cited for Sperry radar systems |
| Input frequency | 50 / 60 Hz | Standard shipboard AC supply |
| Input current (max) | — | To be determined from power draw of radar |
| Output voltages / rails | Multiple DC outputs (e.g. high voltage for magnetron, low voltages for logic, control, etc.) | Typical radar power supplies supply e.g. several hundred volts, plus low-voltage rails |
| Power rating / total power | — (e.g. several kilowatts depending on radar transceiver) | S-band radar transceivers often have significant power needs |
| Efficiency | — | Possibly 80–90% if modern design |
| Ripple / stability | — (mV or percent) | For DC rails especially sensitive ones |
| Protection features | Overvoltage protection, overcurrent, short-circuit, surges, thermal shutdown, filters | Critical in radar electronics |
| Cooling / thermal design | Heatsinks, forced-air or conduction cooling, temperature limits | Must operate in marine environment |
| Environmental / mechanical | Operating temperature: likely –25 °C to +something (e.g. +55 °C) | Sperry VisionMaster unit spec sets –25 °C minimum. |
| Shock / vibration / humidity / conformal coating | Marine rugged specs (IEC 60945, etc.) | For marine electronics, must resist salt spray, vibration |
| Board revision / firmware version | “Rev. B” or equivalent | As one listing calls it Rev. B |
| Connectors / pinouts | Input AC connector, multiple DC outputs, control / monitor lines (status, feedback) | Must match mating harness in the radar system |
| Isolation / safety | Isolation between input and output, safety barriers, insulation, creepage distances | For compliance with marine and radar equipment standards |
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