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REPAIR OF SINCLAIR TECHNOLOGIES INC. DUPLEXER MODEL MR356B*2 S/N- CCV9693 FREQ. 443.65 MHZ - 448.65 MHZ BROWN BAY REPEATER JAN. 22/08

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REPAIR OF SINCLAIR TECHNOLOGIES INC. DUPLEXER MODEL MR356B*2 S/N- CCV9693 FREQ. 443.65 MHZ - 448.65 MHZ BROWN BAY REPEATER JAN. 22/08. SCHEMATIC. INSIDE VIEW. HAIRLINE CRACKS. RESOLDERED ALL CONNECTIONS. ANTENNA I/P LINE CRACKED. ANTENNA I/P HAIRLINE CRACK (x 10 MAGNIFICATION). - PowerPoint PPT Presentation

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Page 1: SCHEMATIC

REPAIR OF SINCLAIR TECHNOLOGIES INC.

DUPLEXER MODEL MR356B*2

S/N- CCV9693FREQ. 443.65 MHZ - 448.65 MHZ

BROWN BAY REPEATERJAN. 22/08

Page 2: SCHEMATIC

SCHEMATIC

Page 3: SCHEMATIC

HAIRLINE CRACKS

INSIDE VIEW

RESOLDERED ALL CONNECTIONS

Page 4: SCHEMATIC

ANTENNA I/P LINE CRACKED

Page 5: SCHEMATIC

ANTENNA I/P HAIRLINE CRACK (x 10 MAGNIFICATION)

Page 6: SCHEMATIC

2ND FILTER HAIR LINE CRACK

Page 7: SCHEMATIC

TOP VIEW

DAMAGED SLUG

Page 8: SCHEMATIC

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.

Page 9: SCHEMATIC

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.

Page 10: SCHEMATIC

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.

Page 11: SCHEMATIC

CHARACTERISTICS

Page 12: SCHEMATIC

SPECIFICATION SHT 1

Page 13: SCHEMATIC

SPECIFICATION SHT 2

Page 14: SCHEMATIC

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

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

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