Episode 732 Near-field Simple Magnetic Field Probe 9KHz-3GHz EMC EMI for Conducted Radiation Make your own • #310 making E and H fi... Buy: www.banggood.c... Using probes • #579b Sniffing with an... Be a Patron: / imsaiguy
Back in the 1980s and 90s most people into electronics would have ripped your arms off or spent hours dribbling and dreaming about owning a spectrum analyser with the performance of that TinySA, these days, the comments are *"...unless you're fortunate enough to own a nice one..."* 😁 which really reflects the current state of hobby electronics today 😀
@Guns_N_Gears
Жыл бұрын
I have the same set from Amazon. A trick i learned when sniffing for RF is that once you have made your initial sweep, and you get suspicious of an area, and are not sure if there is an active signal, you can attach a battery powered sma amplifier to increase the signal. Sometimes the signal maybe shielded or too low for those probes alone to pickup. Those battey powered amps are everywhere, and since its rechargeable, its also isolated.
@kennarnett8220
2 жыл бұрын
I love the way you grab your magnifier to read the 100 MHz clock frequency. I carry around a pocket magnifier and a bright flashlight to enable reading small print. The lensing plus entrance pupil reduction improves the MTF. ....😁
@IMSAIGuy
2 жыл бұрын
It's been a few years since I heard someone say MTF. When I retired I threw away all my optics texts
@barrykery1175
3 жыл бұрын
Great video. I just ordered the probes from Banggood. I was going to make a set but it's not worth my time compared to the price of these. Sure beat paying $300 for a set that are sold with my spectrum analyzer. Next I need to pick up a TinySA so I can carry an analyzer around in my pocket. Thanks for posting, Barry
@backyardcnc
10 ай бұрын
Tnx for the review. I saw these on Amazon but was hesitant about them given the cheap price compared to what they cost from the brand name SA companies. Definately will add a set to my next Amazon order! 👍
@johnwest7993
Жыл бұрын
A very good idea to use a Panavise to hold the TinySA. I'll do the same. I'll put the TinySA on 1 and the NanoVNA on another. Thanks.
@PapasDino
3 жыл бұрын
Might be helpful to viewers to explain the why's & wherefores of the difference between what the electric field vs magnetic field indications are telling you and why you'd look for one vs the other (me included!).
@IMSAIGuy
3 жыл бұрын
the short answer is, E field probe will see voltage changes, H field will see current changes. Of course Alan has a detailed video: kzitem.info/news/bejne/xKqv1KpopJ6FaYY
@PapasDino
3 жыл бұрын
@@IMSAIGuy Thanks, I'm sure folks appreciate the distinction!
@subramanianr7206
3 жыл бұрын
That's a wonderful set of probes you have purchased. Many would be doubting about the E and H fields that are emanated from the dipole antenna which combine in the far field to attain the "space quadrature" I do like to either buy or homebrew them.. Thanks for the video..👍👍
@jdmccorful
3 жыл бұрын
Like, in English.
@IMSAIGuy
3 жыл бұрын
they are near field probes only
@subramanianr7206
3 жыл бұрын
@@IMSAIGuy sure, they are. I mentioned the formation of space quadrature in the far field of a dipole antenna, where the electric and the magnetic fields lie perpendicular sustaining each other alternatingly.
@subramanianr7206
3 жыл бұрын
@@jdmccorful !!??
@williamdenbeste9703
3 жыл бұрын
I don't think the 100MHz signal at the uP is a harmonic, I think it is a PLL inside the chip to create a clock that runs the internal logic.
@ThinklikeTesla
3 жыл бұрын
I wonder if anyone has open sourced a set of gerbers for these (as I get ready to send in an order to JCLPCB...)
@JohnUsp
Жыл бұрын
You can attach to it an amplifier.
@TheElectronicDilettante
2 жыл бұрын
I bought the same set. My question , how do they work when there is continuity between both poles of the sma connector? At least the ones I purchased seem to be shorted between the soldered connections of the sma to the probe. Any input would be appreciated. Thanks for the video
@IMSAIGuy
2 жыл бұрын
think of a transformer with only one turn. the fields you measure set up currents in the turn
@TheElectronicDilettante
2 жыл бұрын
Duh, That makes total sense. Thanks for the reply and all the great videos.
@emanoeldeoliveira8943
2 ай бұрын
Você tem algum vídeo utilizando o tiny sa para fazer alinhamentos de transceptores?
Will I need an attenuator to prevent overload damage when getting near small transformers and such on a PCB? (I plan to buy a TinySA Ultra.) These probes seem useful to identify clock frequency and HF on the DAC of toy keyboards etc. In many circuits with resistor controlled clock the frequency drops or the thing crashes when directly connecting e.g. an oscilloscope to clock pins.
@IMSAIGuy
5 ай бұрын
no, they are safe
@espenbgh2540
Жыл бұрын
Please - next time set the focus to infinite. that will make all clear instead of floating focus shifting back and forward all the time
@keyright2001
25 күн бұрын
And is it possible to use these probes in order to determine the antenna's directional pattern?
@IMSAIGuy
25 күн бұрын
I suppose, near field pattern, but that doesn't really mean much.
@TheChipburner
2 жыл бұрын
This magnetic probes appears to be shielded only from one side because of use 2-layer PCB instrad of 3-layer. Does it affect performance?
@IMSAIGuy
2 жыл бұрын
I've build ones with coax. I don't see any difference
@bobkozlarekwa2sqq59
3 жыл бұрын
Where did you purchase them from?
@IMSAIGuy
3 жыл бұрын
ebay search for: Near-field Simple Magnetic Field Probe 9KHz-3GHz EMC EMI for Conducted Radiation
@Radiocruncher
3 жыл бұрын
@@IMSAIGuy I’ve been looking out for some of these for a while so thanks for showing them
@jdmccorful
3 жыл бұрын
Could you demonstrate more uses of the probes with an SA?
@jdmccorful
3 жыл бұрын
I have an idea for you. Just wondering if a near-field probe could be used with an SA to align FM radio or receiver? What do you think?
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