EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: mzzj on April 06, 2018, 09:45:12 am
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Was playing along with these and diy cable TDR. These were quite ugly compared to better terminators so I decided to take a look inside:
(https://i.imgur.com/2Mzkvkwh.jpg)
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Was playing along with these and diy cable TDR. These were quite ugly compared to better terminators so I decided to take a look inside:
(https://www.eevblog.com/forum/testgear/banggood-50-ohm-bnc-feed-through-terminator-a-quick-review/?action=dlattach;attach=329772;image)
(https://www.eevblog.com/forum/testgear/banggood-50-ohm-bnc-feed-through-terminator-a-quick-review/?action=dlattach;attach=329757;image)
Click to enlarge photo.
Indeed, even the Banggood or Aliexpress cheapos are better in terms of construction, reviewed -> HERE (https://www.eevblog.com/forum/testgear/banggood-50-ohm-bnc-feed-through-terminator-a-quick-review/)
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This homebrew was couple of orders better:
(https://i.imgur.com/p9de7A9h.jpg)
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Was playing along with these and diy cable TDR. These were quite ugly compared to better terminators so I decided to take a look inside:
That was a rather thorough "look inside". :)
Thanks for the photo!
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I once was tempted to buy this terminator from Reichelt because it is much cheaper than a Pomona 4119-50. I did not buy it because i did not like its length (it's an invitation to break the BNC jacks of your scope) and because I thought i was too cheap. Seems I was right …
Now if someone could please cut open a Pomona 4119-50 …
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Wow.... the original picture is not even a "feed through" as there is no connection between center pins. I guess that short wire is a "radiator" and pin on the other side is the "receiver?"
Similar story. I took apart a cheapo Chinese made 50 ohm terminator. Ground side was not firmly attached anywhere but it was a "press fit" by folding the wire back and shoving it on a tube. Amazingly, it worked ok for 1.5Ghz.
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That missing feed-through came up to my mind as well. But if you look closely there is a bluish wire running left of the resistor. It ends in the middle of nowhere about in the middle of the resistor. So I assume the cut was cutting also the wire and the center connector at the lower connector.
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I had also bought one of those from reichelt.de some years ago. If I remember correct, they were even specced for 1GHz bach then :palm:
As I checked this one, it turned out to be good up to maybe 30MHz.
I have built way cheaper ones with a BNC plug and socket like on the picture above from BravoV.
The caveat with those is the low power rating for the SMD resistor(s).