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The TDR

The TDR. Time Domain Reflectometer. by Charles Hallock AA3WS. Fish Can’t Read. CONTENTS. Time Domain Reflectometers Tektronix 1502 TDR Cable Tester 4SQRP Club HF Test Set Make Your Own ARES Work Done With The TDR Hospitals and PG EOC Evaluated Lessons Learned.

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The TDR

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  1. The TDR Time Domain Reflectometer The TDR V5

  2. byCharles HallockAA3WS The TDR V4

  3. Fish Can’t Read The TDR V4

  4. CONTENTS • Time Domain Reflectometers • Tektronix 1502 TDR Cable Tester • 4SQRP Club HF Test Set • Make Your Own • ARES Work Done With The TDR • Hospitals and PG EOC Evaluated • Lessons Learned The TDR V4

  5. Time Domain Reflectometers Tektronix 1502 TDR Cable Tester 4SQRP Club HF Test Set Make Your Own The TDR V4

  6. Tektronix 1502 TDR Cable Tester • Measure the Length of a Cable • Demonstrate Shorts and Opens • Show Humps and Bumps The TDR V4

  7. Measure the Length of a Cable ZERO The TDR V4

  8. Measure the Length of a Cable ROTATE to the ZERO Line ZERO Line ROTATE The TDR V4

  9. Demonstrate Shorts and Opens OPEN SHORT The TDR V4

  10. Show Humps and Bumps Six Foot Cable B&C Connector and Barrel Connector The TDR V4

  11. 4SQRP Club HF Test Set The TDR V4

  12. 4SQRP Club HF Test Set Copied with permission of the 4SQRP Club The TDR V4

  13. 4SQRP Club HF Test Set • Measure the Length of a Cable • Demonstrate Shorts and Opens The TDR V4

  14. Measure the Length of a Cable ~540 nSec The TDR V4

  15. Measure the Length of a Cable The 4 States QRP Group HF Test Set Construction Manual Pages 28 and 30 Copied with permission of the 4SQRP Club The TDR V4

  16. Measure the Length of a Cable ~540 nSec The TDR V4

  17. Demonstrate Shorts and Opens OPEN SHORT The TDR V4

  18. Demonstrate Shorts and Opens The 4 States QRP Group HF Test Set Construction Manual Pages 28 and 30 Copied with permission of the 4SQRP Club The TDR V4

  19. Make Your Own Copied with permission of the 4SQRP Club Copied with permission of the 4SQRP Club The TDR V4

  20. SCHEMATIC Copied with permission of the 4SQRP Club The TDR V4

  21. PARTS LIST Copied with permission of the 4SQRP Club The TDR V4

  22. TDR CIRCUIT BOARD LAYOUT The TDR V4

  23. 333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333 PROTOTYPE CIRCUIT BOARD The TDR V4

  24. ARES Work Done With The TDR • Fort Washington Hospital • Laurel Hospital • PG County EOC • MedStar Southern Maryland Hospital • Lessons Learned The TDR V5

  25. Fort Washington The TDR V4

  26. Laurel Hospital The TDR V4

  27. Laurel Hospital The TDR V4

  28. PG County EOC Water in the Coax The TDR V4

  29. Lessons Learned • Shorted lighting arrestors may not be seen with a Antenna Analyzer. • Shorted cables near the antenna may pass RF at a reduced level with a DC short indication. • Shorted cables near the antenna end may show higher than normal SWR at VHF and UHF frequencies. • Water in the coax makes strange humps and bumps in TDR scope (Condition discovered by NX3SS at the EOC). The TDR V4

  30. The TDR Questions? The TDR V4

  31. RF Can’t Readbye The TDR V4

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