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SPERRY MARINE T65825812-7 | New Surplus VisionMaster-FT Modulator
SPERRY MARINE T65825812-7 | New Surplus VisionMaster-FT Modulator - Image 2
SPERRY MARINE T65825812-7 | New Surplus VisionMaster-FT Modulator - Image 3

SPERRY MARINE T65825812-7 | New Surplus VisionMaster-FT Modulator

Original price was: $8,797.00.Current price is: $3,533.00.

Product Core Brief

  • Model: T65825812-7 (Modulator PCB Assembly 25 kW)
  • Brand: Sperry Marine (Northrop Grumman)
  • Series: VisionMaster-FT / BridgeMaster-E X-Band Radar
  • Core Function: Generates high-voltage negative pulse driving the magnetron cathode
  • Type: Modulator PCB Assembly (25 kW X-Band)
  • Key Specs: -8 kV / 8 A output pulse; resonant charging from -600 V to -1200 V; SCR-driven PFN
  • Condition: New Original (New Surplus) or tested pulls — verify with seller
  • Compatibility: VisionMaster-FT / VMFT, Racal Decca BridgeMaster-E / BME
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Category: SKU: T65825812-7 SPERRY MARINE
  • Email:sales@sxrunsheng.cn
  • Phone:+86 15340667322
  • Whatsapp：+86 15340667322

    • Description

    Product Introduction

    The SPERRY MARINE T65825812-7 is a 25 kW X-band modulator PCB assembly. It sits in the radar transceiver unit and generates the high-voltage pulse that drives the magnetron cathode.

    Without this pulse, the radar transmits nothing. The board uses an SCR to resonantly charge a Pulse Forming Network (PFN) from -600 V to -1200 V, then discharges a -8 kV, 8 A negative pulse into the magnetron . Current production remains active — Northrop Grumman still receives DLA orders for this board .

    SPERRY MARINE T65825812-7 | New Surplus VisionMaster-FT Modulator

    Installation & Configuration Guide

    Phase 1 — Pre-Installation (est. 15 min)
    De-energize the radar transceiver unit at the main breaker. ❗ Wait 5 minutes — the PFN and high-voltage capacitors hold lethal charge. Verify zero voltage at the magnetron cathode with a Fluke 115 multimeter rated for 1 kV. Photograph all connector positions and the board’s mounting orientation.

    Phase 2 — Removal (est. 5 min)
    Label every cable going to the modulator board. Discharge the magnetron cathode to ground through a 10 kΩ, 25 W resistor before touching any high-voltage connection. Release the board mounting screws and pull straight out. Inspect the magnetron connection point for arcing marks.

    Phase 3 — Installation (est. 10 min)
    ESD wrist strap on, grounded to transceiver chassis. Verify the replacement board matches T65825812-7 exactly — different suffixes use different connector layouts. Seat the board and secure mounting screws. Reconnect cables per your photos. ❗ Do not wire from memory — the high-voltage section has no reverse-polarity protection.

    Phase 4 — Power-On & Testing (est. 15 min)
    Energize the transceiver. Observe the radar display for transmit status. Run a transmission test and verify magnetron current draw is within normal range. Check for arcing or corona at the high-voltage connections with the cabinet closed. Log the swap with date, part number, and radar system serial number.

    Troubleshooting Quick-Reference:

    • Radar powers up but no transmission → suspect modulator, interlock, or magnetron
    • Radar trips on startup → do not cycle power; isolate overcurrent or shorted component
    • Intermittent transmit → thermal-related failure or loose connector; monitor temperature rise
    • ❗ Wrong revision installed → T65825812-7 differs from T65825812-3 and other suffixes in connector layout. Match the exact suffix.

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