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Thanks, Dennis.? That looks about right.? 1.5 ns corresponding to about 1 foot of fiber prop delay.IIRC, we used ST and FC/PC fiber connectors back then.? I think my OIG502 had an FC on it.? I'm not familiar with the diamond connectors.Nice collection of 7S12, 7S11s, 7T11s, and 7T11As you have!? I struggle with my 7S12, 7S11, two S4s, and S-53s to get a stable trace.? Right now I put them in my 7904, but eventually I want to use my 7603 for the larger screen.? Got to fix the warped middle plug-in connector on the 7603 first, though.JimSent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: Dennis Tillman W7PF <dennis@...> Date: 8/11/19 5:32 PM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] oh yeah? Hi Jim,I uploaded another screen shot into the album I created last night. The album is at /g/TekScopes/album?id=94144The photo is called? 7) S-42 Internal Reflections. It shows what happens to the S-42 internal reflections until they die out about 1.5nSec after the optical pulse ends.If you were doing optical work with fibers in the early 1990s you may have been using Diamond 3.5mm optical connectors like the ones in the 7F10 Optical to Electrical Converter plug-in I have. I would like to be able to use it but I have not been able to find that connector anywhere nor have I found an adapter that would allow me to use a more common fiber optic connector so I could plug the newer connector in one end of the optical adapter cable and plug the other end of the optical adapter cable into the 7F10. That would allow me to use the 7F10 without trying to change the Diamond 3.5mm connector.Dennis Tillman W7PF-----Original Message-----From: [email protected] [mailto:[email protected]] On Behalf Of Jim FordSent: Sunday, August 11, 2019 2:01 PM<snip> Dennis, it looks like the S-42 has a bit of reflections inside it.? The OIG-502 uses an ingenious scheme to avoid generating them at the source; the laser diode is biased such that any current reflections on its input due to imperfections in the termination are below the LD threshold current.? LD physics is such that the current reflections have no effeffect on the optical output.? Voila, reflection-free optical impulses!? I assume a brilliant engineer at Tek came up with that; correct me if I'm wrong.? I had one back in the mid 1990's at Lockheed Aircraft Service Co., housed in a TM502 mainframe (the TM501 was unavailable at the time, IIRC).Jim Ford Sent -- Dennis Tillman W7PFTekScopes Moderator
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