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Time Domain Reflectometer (was Re: internet outages)

On Sunday, December 23, 2018 07:33:38 PM Doug wrote:
> RE: Time Domain Reflectometer:
> Theoretically, you can build your own with a fast pulse generator and an
> oscilloscope. The trick is, you need a REALLY FAST oscilloscope!  The
> pulse generator is easy, just a couple of transistors, maybe a diode.
> The  circuit is probably in every edition of the Radio Amateur's
> Handbook. The scope is expensive. If you don't have at least a 1GHz
> digital sampling scope, don't bother!
> --doug, WA2SAY, retired RF engineer

Hmm, with CPU clocks hitting 4 GHz, I wonder how expensive an ADC converter to 
work at corresponding speeds would be?  (Just an idle question ;-)