near field probe are definitely great tools attach to spectrum analyzer. Especially a good tool to detect the potential PD generate , and pick up from LV equipment sensors, from the main asset.
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.
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. ....😁
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
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 😀
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! 👍
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
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!).
the short answer is, E field probe will see voltage changes, H field will see current changes. Of course Alan has a detailed video: th-cam.com/video/ctynv2klT6Q/w-d-xo.html
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..👍👍
@@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.
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.
near field probe are definitely great tools attach to spectrum analyzer. Especially a good tool to detect the potential PD generate , and pick up from LV equipment sensors, from the main asset.
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.
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. ....😁
It's been a few years since I heard someone say MTF. When I retired I threw away all my optics texts
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
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.
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 😀
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! 👍
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.
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
think of a transformer with only one turn. the fields you measure set up currents in the turn
Duh, That makes total sense. Thanks for the reply and all the great videos.
I wonder if anyone has open sourced a set of gerbers for these (as I get ready to send in an order to JCLPCB...)
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!).
the short answer is, E field probe will see voltage changes, H field will see current changes. Of course Alan has a detailed video: th-cam.com/video/ctynv2klT6Q/w-d-xo.html
@@IMSAIGuy Thanks, I'm sure folks appreciate the distinction!
Você tem algum vídeo utilizando o tiny sa para fazer alinhamentos de transceptores?
th-cam.com/video/Kvs7t7NHvJY/w-d-xo.htmlsi=zfoPiiITjkDdwQEh
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..👍👍
Like, in English.
they are near field probes only
@@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.
@@jdmccorful !!??
And is it possible to use these probes in order to determine the antenna's directional pattern?
I suppose, near field pattern, but that doesn't really mean much.
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.
no, they are safe
You can attach to it an amplifier.
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?
I've build ones with coax. I don't see any difference
Where did you purchase them from?
ebay search for:
Near-field Simple Magnetic Field Probe 9KHz-3GHz EMC EMI for Conducted Radiation
@@IMSAIGuy I’ve been looking out for some of these for a while so thanks for showing them
Please - next time set the focus to infinite. that will make all clear instead of floating focus shifting back and forward all the time
Could you demonstrate more uses of the probes with an SA?
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?
I did: th-cam.com/video/u5IBW47g80M/w-d-xo.html
@Roger Avi go away scammer lol