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SCHEMATIC - PowerPoint PPT Presentation

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SCHEMATIC

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  1. REPAIR OF SINCLAIR TECHNOLOGIES INC. DUPLEXER MODEL MR356B*2S/N- CCV9693FREQ. 443.65 MHZ - 448.65 MHZBROWN BAY REPEATERJAN. 22/08

  2. SCHEMATIC

  3. INSIDE VIEW HAIRLINE CRACKS RESOLDERED ALL CONNECTIONS

  4. ANTENNA I/P LINE CRACKED

  5. ANTENNA I/P HAIRLINE CRACK (x 10 MAGNIFICATION)

  6. 2ND FILTER HAIR LINE CRACK

  7. TOP VIEW WEAK MECHANICAL SUPPORT NO STANDOFF SUPPORT DAMAGED SLUG

  8. ACTIONS TAKEN • ALL CONNECTIONS TO CENTRE CONDUCTORS OF SEMI-RIGID LINES THAT WHERE VISIBLE WERE RE-SOLDERED. • INSPECTED ALL CONNECTIONS AFTER CLEANING WITH IPA SOLVENT AND BRISTLE BRUSH. • ANTENNA I/P CONNECTOR RE-SOLDERED AT JUNCTION OF CONNECTOR SHELL AND SEMI-RIGID LINE USING 'HOT PLATE' PROCESS. • NEW SPLIT AND STAR WASHERS ADDED TO FRONT COVER PLATE ONLY. • ALL REMAINING HARDWARE ON BACK PANEL TIGHTENED PRIOR TO TESTING. • VSWR TEST CONDUCTED ON HIGH PASS (448.65 MHZ) AND LOW PASS (443.65 MHZ) WITH 50 OHM LOAD ON ANTENNA PORT.

  9. TEST RESULTSAFTER REPAIRS • VSWR TESTS AT 443.65 MHZ WITH 50 OHM LOAD ON ANTENNA AND XMTR ON LOW PASS I/P: <1.2:1. • VSWR TESTS AT 448.650 MHZ WITH 50 OHM LOAD ON ANTENNA AND XMTR ON HIGH PASS I/P <1.7:1.

  10. CONCLUSION: PROBABLE CAUSE OF FAILURE • FATIGUED SOLDER JOINTS DUE TO STRESS ON EXTERIOR SEMI-RIGID LINES. • ALL CENTRE CONDUCTOR CONNECTIONS ON SEMI-RIGID LINES WHERE NOT PRE-TINNED PRIOR TO BEING SOLDERED AT MANUFACTURER, LEADS WERE SOLDERED UNDER STRESS AS EVIDENT FROM LEADS MOVING DURING RE-SOLDERING PROCESS . • LACK OF GOOD MECHANICAL STABILITY ON OUTSIDE PLATE HOLDING BNC CONNECTORS. • NO LOCKING WASHERS USED ON OUTSIDE PLATE TO DETER SCREWS FROM TURNING WHICH IN TURN WOULD CAUSE DE-TUNING OF CAVITIES. • SLIGHT BEND IN FRONT PLATE HOLDING BNC CONNECTORS, LACKS SUPPORT IN CENTRE.

  11. CHARACTERISTICS

  12. SPECIFICATION SHT 1

  13. SPECIFICATION SHT 2

  14. http://www.sinclairtechnologies.com/catalog/product.aspx?id=72http://www.sinclairtechnologies.com/catalog/product.aspx?id=72