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Turn your Oscilloscope into a Reflectometer

Turn your Oscilloscope into a Reflectometer
If you're not familiar with transmission line theory, a reflectometer will probably seem like some sort of magical device to you. But using one, you can find out automatically how far a fault is from one end of a cable, without having to physically access the spot. The little circuit described in this article does a good job compared to expensive test gear.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1 = 15kOhm
R2 = 150Ohm
R3-R7 = 220Ohm
R8 = 22Ohm
R9 = 47Ohm
C1 = 10nF
C2 = 220?F 16V
C3 = 22nF
C4 = 4nF7
C5 = 1nF
C6 = 220pF
C7 = 47pF
D1 = 1N4004
D2 = 1N4148
IC1 = 74AC14 (Farnell # 1014022)
J1 = BNC connector
J2 = DC supply adaptor socket
K1,K2,K3 = 2-way pinheader
S1 = 5-way rotary switch, Lorlin type PT6422/BMH (Farnell # 1123675)

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