Mr Carlson's Lab - 2016-04-02
This is a 1:1 RF active probe that I designed for a specific use. If your working on any RF related circuits that require very light coupling, this may benefit you.
I'm curious to know how the 1M resistor on the input of the op amp is determined. Thanks.
As usual, very interesting , congratulations good video!
I just love your lab, Mr. Carlson. :)
Thanks for sharing.
Excellent video. "behind the scenes" looks so familiar :) Thank you for sharing knowledge. This is priceless.
+Robert Gogol
Your welcome Robert!
Thanks for sharing Paul, your lab makes me happy! This probe is awesome.
+saturn5tony
Thanks Tony! Glad you enjoyed the video.
Great tutorial, could you give us a study on building another prove that can be used up to 1 Ghz for use with a oscilloscope with input impedance of 50 ohms
Nic
Yes, with the active scopes... I've read we should use x3 or x5 or more frequency probe of the frequency of your oscilloscope. I'll have to watch this since I haven't yet and got carried away reading the comments. May be a clue in the schematics where something can be changed say like you can add a potentiometer to see the effect on the circuit Hz. I know when you get into the Ghz range circuits get strange and board design even looks unique with interesting shapes eched into the boards as filters and you almost have to comprehend electronic component design and the board as an antenna with your board design, i.e. each component trace is an antenna with a SWR, impedance, coupling, etc. for optimal design. Interesting learning from a chemist, programmer and project leader background perspective. Mr. Carlson definitely is the best I've watched so far in explaining in detail electronics on a small budget.
More more more!
+Donald Holben
Glad you enjoyed Donald!
I love all your videos, Paul! You've taught me a lot! This week I plan to build a couple of your spectrum analyser protection devices to use with my HP3585A to align my SP-600 IFs. By the way, has anyone ever told you that you look like Vinzenz Kiefer?!
Paul, fantastic project as always. Would love to get a SA one day (or repair one).
+rupert handford
Thanks Rupert!
Nice vid, thanks .
Question tho , what is that huge grey enclosure in the corner ? looks like a 10kw am tx ;)
+Chipz0r
Its an old GATES transmitter :^)
Wow, such a simple design for such a great tool. Thanks for all the insight.
+Justin L.
Your welcome Justin!
Great video. Love the behind the scenes. Thanks.
+PelDaddy
Glad you enjoyed the video!
I very much enjoy your videos and you are a wealth of information! Thank you.
Really good info. Thanks, Paul!
+Mike Lentsch
Your welcome Mike!
great video....i learn a lot of stuff every time i see your videos
Thank you!
+Rob H
Your welcome Rob!
Thank you very much Paul for sharing this nice video with us.
+esmaeil nam
Glad to share Esmaeil :^)
Thanks Paul. It must be nice to have such a great lab!
+Robert Calk Jr.
Thanks Robert!
Would love to see how this handles high frequency square waves.
+Poptart McJelly
This probe could round the edges off any square :^)
Great vid. Thanks for showing round the lab.....looks like a scene from an old Vincent Price movie.
+notionSunday
LOL, Thanks!
That's wonderful design....... Keep going.... :)
great video of the skilled work you do But me being very knew to all this rf radio related stuff its still blowing my brain cells to bits ....keep up your brilliant channel ...
+retro80s
Thanks!
Another excellent and interesting video! Thank you Mr. Carlson
I loved trying to follow along to this one!
+Shaunak De
Glad you enjoyed!
Oh, okay, now I see what is going on. Had to rush out for a while and missed the last part. Caught up now. Thanks.
I just found your videos and I LOVE them....please keep building
Thanks! I will as time permits.
Just curious, did you major in EE and are you an EE yourself or is this just a hobby for you. Im a HS student rn but I really want to get into either electronics or coding
Enjoyed the extra video at the end, I think most of our shops get messy when working on a project. Glad to know your human. 😀
+Chuck Legg
LOL, thanks Chuck!
Do you actually work on other hams radios ? If so let me know. Thanks !
+mykenwood830
At times I do, but right now I'm way too busy. Thanks though!
Great video. I really liked the impromptu tour of the working lab.
+Michael Lloyd
Thanks Michael!
Always professional and a joy to watch.
Great! Which coating method did you use on the pcb (chemical tin plating)?
OK, figured it out. Most likely, it's a "liquid tin" reagent. Some users of this chemical mentioned "egg smell" of the liquid, that is probably due to thiourea content as a complexing agent.
We used a simple 'immersion tin' bath where the usual Sn/Pb was not accepted, and you are quite correct, Sir: Thiourea IS responsible for the rotton-egg smell in from bath, while the Fluoboric acid component is responsible for the burning skin smell when splashed upon one's body parts..
Great video, love the emphasis on correct termination.
Trying to figure the reason for the 2 dislikes,
must be your use of the word "linear" to describe the slight slope in the response on either side of the flat band.
Or maybe, they are people with a very short span of attention, which is quite possible.
Re the comparison to EEV blog below,
this is no BS imparting of knowledge & info, not an entertainment stunt.
Best regards
Mark G
do not care about dislikes. it is youtube recommendation failed for some persons.
It could be they fat fingered it. I did that once, but it tool away my thumbs down when I then hit the thumbs up. People who are threatened because they have no inkling of what Paul’s talking about may downvote just to protect their ego. Mr Carlson has taught me a lot and I expand my mind every time I watch.
Very interesting presentation. Thanks for sharing.
Fantastic project and again an excellent talk! Thanks for sharing! Just one question: why not have the runner of the 1k connected to the minus input of the opamp and the high end towards the output?
Very good work thank you for sharing
+DENNIS N
Your welcome Dennis!
I would enjoy knowing how you distribute power to all your test gear... especially the grounding system... as well as protection for over voltage between and during work sessions. Consider a video on that subject! Thank you!
hi Mr Carlson!
is it possible to have a copy 1:1 of the printed circuit board?
THANKS!
and...Happy New Year!
i2NDT Claudio
+MrCarlson, thank you so much for this video and for your channel. The content is excellent, presentation is impeccable, and pace/depth/completeness is unlike anything on YouTube. Kudos and thank you!
Thanks for your kind words Cody!
Thank you!....., You (yet again), just saved me a pile of trouble having to do this myself from scratch!....... I just haft to figure out where to etch your name?, on the board of my build of your probe lol.
+ytrewq6789
Your welcome! LOL, my name is to big for the board size :^)
Another excellent video, always impressed by your extremely tidy printed circuits.
+g0fvt
Thanks! That toner transfer method works well.
Hi. Great video. Can you help me understand what sets bias of the output transistor? Also why does the combined 50ohm go to ground and not between transistor emitter and the cable?
+Szymon Jachim
Its all about impedance and reflected signals. I will do a video on this in the future. My TDR video may help you understand https://youtu.be/I1gfUNh5PJQ
how to use this active probe for the measurement of far field.
Excellent job Paul! really all thumps up as I exactly know what it means to do a build like this. wish I had a bit more time....
Take care and talk to you soon 73
+TRXBench
Thanks Peter!
I did enjoy it, though I suspect not as much as you did! :)
+Pablo Padilla
Thanks Pablo!
Hi there Your probe is amazing . I do alot of audio work for a hobby . Do you have a kit of this probe mainly for the circuit board as this would be great to build . Thanks John
John Weegenaar, Paul has been asked if he has kits or boards of any of his projects and his answer is usually a 'no' with some sort of suggestion that the maker should make boards themself... in other words, "NO."
You drew one of your Schotkeys as a Zener on your schematic. ;)
+Justin L.
You must be seeing something I'm not.
+Mr Carlson's Lab On your whiteboard, it looked like a schotkey was drawn with the S as a Z
first rule of chess is that you can only learn from a better opponent...
thanks for your work Paul, we appreciate it.
Thanks for your kind comment!
Paul, Wow! that was pretty amazing. I love the way you explain every step along the way. And the circuit you built is very clever. Also like the way you utilize every piece of test gear. I am also looking for another spectrum analyzer. Really in the need for a more modern one with tracking generator. The old IFR 1200 just does not cut it since there is not tracking gen. he option is about a grand but still no onscreen display. I want to be able to do some V/UHF duplexer tuning. Plus want to homebrew a 4 cavity VHF duplexer :)Great job as always my friend.
+The Radio Shop
Thanks Buddy! That IFR 1200 is still a real neat piece of equipment. Take care!
Great video - THX!
Christoph Schuermann - 2017-11-03
I have got the impression that you love measurement equipment, and dont need to think about room temperature in wintertime....