1 / 14

SCHEMATIC

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).

geordi
Download Presentation

SCHEMATIC

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related