On 4/5/22 03:50, JCB_SFR wrote:
??? Since I noticed that you were one of the rare persons to still know about The HP TDR equipment 1817A, I just give you the end of the story : By chance, I manage to get two genuine sampling diodes in good condition from an old equipment, and my TDR is now working again. But I recognize that designing new sampling assemblies from modern beam lead microwave diodes is the only long term way to carry on with this equipment. As a matter of fact, digital scopes from Le Croy or Tektro? offer the same performance (even better) without sampling, but they are far above my financial means. Recently, a small start-up US company offers a sampling box for P.C., giving good performances (up to 12 GHz) at a reasonable price, and their schematics is available. I might try to build one, but right now, my old HP stuff in convieneient for my use, as long as I protect the sampling diodes from overvoltages (+-1.5 V) !
Just chiming in here, I have an 1817A, and some related HP TDR stuff. I've not done anything with it, but due to lack of time, rather than lack of interest. Hopefully someday..
-Dave
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Dave McGuire, AK4HZ
New Kensington, PA
Dave McGuire