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Phone: +86 16626708626Description
Key Technical Specifications
- Part number: 65825812-3.
- Brand: Sperry Marine.
- Product type: X-band radar modulator PCB.
- Power class: 25 kW.
- Function: Generates the high-voltage pulse for the magnetron.
- Output characteristic: Negative pulse, approximately 8 kV / 8 A.
- Application: VisionMaster Radar X-band systems.
- Condition: Reconditioned.
- Warranty: 3 months on the listed source.
- Compatibility note: Confirm radar model, transceiver setup, and mounting revision before ordering.
Product Introduction
Sperry Marine 65825812-3 is a 25 kW X-band radar modulator PCB used in VisionMaster Radar systems. The modulator’s job is to generate the high-voltage pulse that drives the magnetron, which is why this part matters when the radar stops transmitting properly.globalshipspares+1
This board is usually sourced as a repair or replacement item for shipboard radar downtime. Verify the exact radar family, transceiver arrangement, and revision before installation, because a 25 kW modulator must match the existing high-voltage section and magnetron setup.sperrymarine+1
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Radar powers up but no transmission | Modulator failure, interlock issue, or magnetron problem | ✅ High | Check transmit status, interlocks, and high-voltage output | If supply and interlocks are good, suspect the modulator |
| No radar echo or very weak return | Modulator output low or pulse formation issue | ✅ High | Verify transmit pulse activity and compare against known-good operation | Replace only after confirming antenna and receiver are healthy |
| Radar trips on startup | Overcurrent, shorted component, or PSU fault | ✅ High | Measure input rails and inspect for blown fuses or burned parts | Do not keep cycling power; isolate the fault first |
| Intermittent radar transmit | Heat-related failure, loose connector, or aging component | ✅ Medium | Run the unit under load and monitor temperature rise | Reseat connectors and retest before replacement |
| Radar shows normal display but no power output | High-voltage section fault or modulator board issue | ✅ High | Check for transmit pulse and magnetron drive voltage | If the pulse is absent, replacement is likely |
| Equipment works after warm-up only | Marginal board, cracked solder joint, or aging capacitors | ✅ Medium | Perform a cold-start and repeat after thermal soak | Reconditioned boards should be tested under load before install |
Contact technical support with photos of the label, connector side, and any diagnostic logs if the fault is still unclear.
- Sperry Marine 65825812-3 (25kW)
- Sperry Marine 65825812-3 (25kW)
Frequently Asked Questions
Q: Is 65825812-3 the modulator PCB for a 25 kW radar?
A: Yes, it is listed as a Sperry Marine 25 kW X-band modulator PCB, and the function is to generate the high-voltage pulse for the magnetron.nsdkhulna.navy+1
Q: Is this new or used?
A: The listing I found describes it as reconditioned, not factory-new. That means it should be tested, but it is not fresh OEM stock.alshifamarinestore+1
Q: What radar system does it fit?
A: It is associated with Sperry Marine VisionMaster Radar X-band systems. Still verify the exact transceiver and cabinet revision before ordering.sperrymarine+1
Q: Can I swap it without changing anything else?
A: Not safely. High-voltage radar parts can look similar but differ in mounting, connector layout, and pulse characteristics. Match the old board before power-up.
Q: Why is reconditioned cheaper than new?
A: Because it comes from recovered stock that has been cleaned, checked, and tested instead of current OEM production. That lowers cost, but you should still ask for test confirmation and warranty terms.
Q: What is the main installation risk?
A: The main risk is using a board with the wrong radar variant or high-voltage setup. ❗Do not wire from memory. Confirm the exact part number, radar family, and connector positions before energizing.
Q: Does it come with a warranty?
A: The listed source says 3 months. For a board like this, get the warranty terms in writing and confirm what test standard was used before shipment.
