The TDR Time Domain Reflectometer 5262017 The TDR

  • Slides: 31
Download presentation
The TDR Time Domain Reflectometer 5/26/2017 The TDR V 5 1

The TDR Time Domain Reflectometer 5/26/2017 The TDR V 5 1

by Charles Hallock AA 3 WS 4/30/2013 The TDR V 4 2

by Charles Hallock AA 3 WS 4/30/2013 The TDR V 4 2

Fish Can’t Read 4/30/2013 The TDR V 4 3

Fish Can’t Read 4/30/2013 The TDR V 4 3

CONTENTS • Time Domain Reflectometers – Tektronix 1502 TDR Cable Tester – 4 SQRP

CONTENTS • Time Domain Reflectometers – Tektronix 1502 TDR Cable Tester – 4 SQRP Club HF Test Set – Make Your Own • ARES Work Done With The TDR – Hospitals and PG EOC Evaluated – Lessons Learned 4/30/2013 The TDR V 4 4

Time Domain Reflectometers Tektronix 1502 TDR Cable Tester 4 SQRP Club HF Test Set

Time Domain Reflectometers Tektronix 1502 TDR Cable Tester 4 SQRP Club HF Test Set Make Your Own 4/30/2013 The TDR V 4 5

Tektronix 1502 TDR Cable Tester • Measure the Length of a Cable • Demonstrate

Tektronix 1502 TDR Cable Tester • Measure the Length of a Cable • Demonstrate Shorts and Opens • Show Humps and Bumps 4/30/2013 The TDR V 4 6

Measure the Length of a Cable ZERO 4/30/2013 The TDR V 4 7

Measure the Length of a Cable ZERO 4/30/2013 The TDR V 4 7

Measure the Length of a Cable ROTATE to the ZERO Line ROTATE 4/30/2013 The

Measure the Length of a Cable ROTATE to the ZERO Line ROTATE 4/30/2013 The TDR V 4 8

Demonstrate Shorts and Opens OPEN 4/30/2013 SHORT The TDR V 4 9

Demonstrate Shorts and Opens OPEN 4/30/2013 SHORT The TDR V 4 9

Show Humps and Bumps Six Foot Cable B&C Connector and Barrel Connector 4/30/2013 The

Show Humps and Bumps Six Foot Cable B&C Connector and Barrel Connector 4/30/2013 The TDR V 4 10

4 SQRP Club HF Test Set 4/30/2013 The TDR V 4 11

4 SQRP Club HF Test Set 4/30/2013 The TDR V 4 11

4 SQRP Club HF Test Set Copied with permission of the 4 SQRP Club

4 SQRP Club HF Test Set Copied with permission of the 4 SQRP Club 4/30/2013 The TDR V 4 12

4 SQRP Club HF Test Set • Measure the Length of a Cable •

4 SQRP Club HF Test Set • Measure the Length of a Cable • Demonstrate Shorts and Opens 4/30/2013 The TDR V 4 13

Measure the Length of a Cable ~540 n. Sec 4/30/2013 The TDR V 4

Measure the Length of a Cable ~540 n. Sec 4/30/2013 The TDR V 4 14

Measure the Length of a Cable The 4 States QRP Group HF Test Set

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 4 SQRP Club 4/30/2013 The TDR V 4 15

Measure the Length of a Cable ~540 n. Sec 4/30/2013 The TDR V 4

Measure the Length of a Cable ~540 n. Sec 4/30/2013 The TDR V 4 16

Demonstrate Shorts and Opens OPEN 4/30/2013 SHORT The TDR V 4 17

Demonstrate Shorts and Opens OPEN 4/30/2013 SHORT The TDR V 4 17

Demonstrate Shorts and Opens The 4 States QRP Group HF Test Set Construction Manual

Demonstrate Shorts and Opens The 4 States QRP Group HF Test Set Construction Manual Pages 28 and 30 Copied with permission of the 4 SQRP Club 4/30/2013 The TDR V 4 18

Make Your Own Copied with permission of the 4 SQRP Club 4/30/2013 The TDR

Make Your Own Copied with permission of the 4 SQRP Club 4/30/2013 The TDR V 4 19

SCHEMATIC Copied with permission of the 4 SQRP Club 4/30/2013 The TDR V 4

SCHEMATIC Copied with permission of the 4 SQRP Club 4/30/2013 The TDR V 4 20

PARTS LIST Copied with permission of the 4 SQRP Club 4/30/2013 The TDR V

PARTS LIST Copied with permission of the 4 SQRP Club 4/30/2013 The TDR V 4 21

TDR CIRCUIT BOARD LAYOUT 4/30/2013 The TDR V 4 22

TDR CIRCUIT BOARD LAYOUT 4/30/2013 The TDR V 4 22

PROTOTYPE CIRCUIT BOARD 33333333333 33333333333 4/30/2013 The TDR V 4 23

PROTOTYPE CIRCUIT BOARD 33333333333 33333333333 4/30/2013 The TDR V 4 23

ARES Work Done With The TDR • • • Fort Washington Hospital Laurel Hospital

ARES Work Done With The TDR • • • Fort Washington Hospital Laurel Hospital PG County EOC Med. Star Southern Maryland Hospital Lessons Learned 5/26/2017 The TDR V 5 24

Fort Washington 4/30/2013 The TDR V 4 25

Fort Washington 4/30/2013 The TDR V 4 25

Laurel Hospital 4/30/2013 The TDR V 4 26

Laurel Hospital 4/30/2013 The TDR V 4 26

Laurel Hospital 4/30/2013 The TDR V 4 27

Laurel Hospital 4/30/2013 The TDR V 4 27

PG County EOC Water in the Coax 4/30/2013 The TDR V 4 28

PG County EOC Water in the Coax 4/30/2013 The TDR V 4 28

Lessons Learned • Shorted lighting arrestors may not be seen with a Antenna Analyzer.

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 NX 3 SS at the EOC). 4/30/2013 The TDR V 4 29

The TDR Questions? 4/30/2013 The TDR V 4 30

The TDR Questions? 4/30/2013 The TDR V 4 30

RF Can’t Read bye 4/30/2013 The TDR V 4 31

RF Can’t Read bye 4/30/2013 The TDR V 4 31