Stopping a WiFi Jammer and Other Radiation Is Easy
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Date: 2026-03-07
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Comments and reviews: 20
BatteryLABx
Sir U allways need to connect metal shield to ground negative supply of tha device, the connection makes RFI absorption returning to negative, minimizing output radiation. Anyway I'm wondering about battery SPOT welders, those devices do very high currents in a short period of time. maybe 300A in 10mS period ( electronics course We call this a dirac pulse, where all energy goes on a very short pulse aka EMP pulse! )
Maybe a good video on this topic. but remember SDR spectrum scanning rate is 1second at defined frequency range, sooo not sure if it captures those pulses.
The question about SPOT welders is Does IT have HARMFUL effects on health! (imagine spoting a battery 17S8P means 136cells, soo doin math, if 3 spots at each cell x2 sides means 816 spots for each battery)
means a lot of pulses radiation for tha person near this device!
Sorry long comment! keep Ur great Work! yeahhh
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Sir U allways need to connect metal shield to ground negative supply of tha device, the connection makes RFI absorption returning to negative, minimizing output radiation. Anyway I'm wondering about battery SPOT welders, those devices do very high currents in a short period of time. maybe 300A in 10mS period ( electronics course We call this a dirac pulse, where all energy goes on a very short pulse aka EMP pulse! )
Maybe a good video on this topic. but remember SDR spectrum scanning rate is 1second at defined frequency range, sooo not sure if it captures those pulses.
The question about SPOT welders is Does IT have HARMFUL effects on health! (imagine spoting a battery 17S8P means 136cells, soo doin math, if 3 spots at each cell x2 sides means 816 spots for each battery)
means a lot of pulses radiation for tha person near this device!
Sorry long comment! keep Ur great Work! yeahhh
reply
andrew32155
greatscottlab be careful what you say about: Not illegal because it has a minimal range. I don’t know what EU or other nations laws are, but the US laws and FCC regulations on this are clear that they make no distinction for power or range. And that selling, importimg, or using such a device is illegal under all circumstances.
Obviously, in practical terms, thousands of such devices enter the US constantly, and there's no active enforcment if you only test them on yourself. It isn't actually illegal to be in posession, or to construct your own, but it's still technically illegal to even just jam yourself.
And there are specific regulations to follow if you are testing such jamming & deliberate interference for legitimate scientific or engineering reasons.
But at minimum, even in the It's only a few dollars, low power, and low range, toy-category, US law makes no exceptions. Beware.
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greatscottlab be careful what you say about: Not illegal because it has a minimal range. I don’t know what EU or other nations laws are, but the US laws and FCC regulations on this are clear that they make no distinction for power or range. And that selling, importimg, or using such a device is illegal under all circumstances.
Obviously, in practical terms, thousands of such devices enter the US constantly, and there's no active enforcment if you only test them on yourself. It isn't actually illegal to be in posession, or to construct your own, but it's still technically illegal to even just jam yourself.
And there are specific regulations to follow if you are testing such jamming & deliberate interference for legitimate scientific or engineering reasons.
But at minimum, even in the It's only a few dollars, low power, and low range, toy-category, US law makes no exceptions. Beware.
reply
jameshatton4211
And people who are FPV pilots laughed at me for shielding my main board escs, shielding my VTX and shielding my receiver each individually on a 2 inch micro quad.
Yes I want a crispy video link and no questions about probable cause if the signal is crap. Illuminate the drone as the interference source first and foremost as you have control over it.
THEN start diagnosing your environment using an SDR if needs be
Nobody wants baby monitor in their FPV goggles because you're drone is acting as an all accepting repeater station.
I went to digital asap but I'm still shielding my quad copters. The indoor tiny micro I'm not bothering with they are so tiny it's insane. I don't ever want to break tiny expensive lil thing!
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And people who are FPV pilots laughed at me for shielding my main board escs, shielding my VTX and shielding my receiver each individually on a 2 inch micro quad.
Yes I want a crispy video link and no questions about probable cause if the signal is crap. Illuminate the drone as the interference source first and foremost as you have control over it.
THEN start diagnosing your environment using an SDR if needs be
Nobody wants baby monitor in their FPV goggles because you're drone is acting as an all accepting repeater station.
I went to digital asap but I'm still shielding my quad copters. The indoor tiny micro I'm not bothering with they are so tiny it's insane. I don't ever want to break tiny expensive lil thing!
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jamjest1
i mean kinda true. But please, shielding, ferrite beads and so on are just a bandage for open broken bone.
Please just research the absolute basics like continuous ground reference etc. emc before designing the pcb. It is easy for most of simple pcb designs like a mentioned proper ground plane/polygon (I did some 8 layer designs that must work as safety in very noisy environments and I agree that in the context of human life like in my design it was not simple)
BUT for most of the designs you do it just shrinks to do I make noise and how do I mitigate this
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i mean kinda true. But please, shielding, ferrite beads and so on are just a bandage for open broken bone.
Please just research the absolute basics like continuous ground reference etc. emc before designing the pcb. It is easy for most of simple pcb designs like a mentioned proper ground plane/polygon (I did some 8 layer designs that must work as safety in very noisy environments and I agree that in the context of human life like in my design it was not simple)
BUT for most of the designs you do it just shrinks to do I make noise and how do I mitigate this
reply
paranoidzkitszo
The Pluto is marketed more to the educational. school/ class setting. from what i see. then, I just find. or can't- find support/ content. a usergroup with examples and troubleshooting- alot. ALOT of these gadgets are enough trouble as it is. so having something like a basic wiki is tremendous or a forum. forums.
Saying that. it'd be awesome to see from basics. how someone connects up, any drivers, any specific projects. maybe what projects you are uttillizing the Pluto for would be stellar!
PS great video. something different. Thank you for that.
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The Pluto is marketed more to the educational. school/ class setting. from what i see. then, I just find. or can't- find support/ content. a usergroup with examples and troubleshooting- alot. ALOT of these gadgets are enough trouble as it is. so having something like a basic wiki is tremendous or a forum. forums.
Saying that. it'd be awesome to see from basics. how someone connects up, any drivers, any specific projects. maybe what projects you are uttillizing the Pluto for would be stellar!
PS great video. something different. Thank you for that.
reply
nand2624
A few things to note. SDR isn't the best way to measure interference/noise. It can show it but can't properly quantify ( unless you know what you're doing.
The gain of your SDR in sdrpp 5: 15 is turned to max, this has an advantage of showing even the tiniest noise but most of the time, the magnitude of this noise drops so much over the frequency that it isn't worth shielding (for example the harmonics of your buck at 100's of MHz.
Also, it's a good idea to get a rtl-sdr while working with a lower frequency.
reply
A few things to note. SDR isn't the best way to measure interference/noise. It can show it but can't properly quantify ( unless you know what you're doing.
The gain of your SDR in sdrpp 5: 15 is turned to max, this has an advantage of showing even the tiniest noise but most of the time, the magnitude of this noise drops so much over the frequency that it isn't worth shielding (for example the harmonics of your buck at 100's of MHz.
Also, it's a good idea to get a rtl-sdr while working with a lower frequency.
reply
bansheedearg
Quick and filthy: Light travels at 300 million m/s. 2. 4 Ghz = 2400 Mhz = 2400 million cycles/s. Budda-boob-budda-bang: the wavelength is 300/2400 = 12. 5 cm. A single pole antenna unloaded (coil/inductor free) is normally 1/4 wave which would be 3 1/8 cm. Hence the antenna is about 1 1/4 long. It's also why old school car antennas, which are around 100Mhz, are 29 in 1/4 wave, and handheld transceivers have stubby antennas because they are mostly a coil.
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Quick and filthy: Light travels at 300 million m/s. 2. 4 Ghz = 2400 Mhz = 2400 million cycles/s. Budda-boob-budda-bang: the wavelength is 300/2400 = 12. 5 cm. A single pole antenna unloaded (coil/inductor free) is normally 1/4 wave which would be 3 1/8 cm. Hence the antenna is about 1 1/4 long. It's also why old school car antennas, which are around 100Mhz, are 29 in 1/4 wave, and handheld transceivers have stubby antennas because they are mostly a coil.
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spencerhodges2424
In the case of a buck convertor, most of the radiation is due to high current spikes in the source loop. Adding and tuning input capacitance to the switching node is critical otherwise you will radiate RF along the entire source wiring. Covering just the PCB will not even help in this case. Minimizing the ground loop by twisting the power and ground can also improve EMI performance, but input capacitance and inductance is the key.
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In the case of a buck convertor, most of the radiation is due to high current spikes in the source loop. Adding and tuning input capacitance to the switching node is critical otherwise you will radiate RF along the entire source wiring. Covering just the PCB will not even help in this case. Minimizing the ground loop by twisting the power and ground can also improve EMI performance, but input capacitance and inductance is the key.
reply
someguy2741
You should look into the addition of a non conductive spacer between the conductive sheets. That was a trick used to shield some powerful MRI and NMR machines. I was told by the designer that the thickness of the shield does not need to be continuous thickness since there is a dampening effect that extends from the surface. In our case they were using steel sheets with 1/8 inch arborite spacer sheets.
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You should look into the addition of a non conductive spacer between the conductive sheets. That was a trick used to shield some powerful MRI and NMR machines. I was told by the designer that the thickness of the shield does not need to be continuous thickness since there is a dampening effect that extends from the surface. In our case they were using steel sheets with 1/8 inch arborite spacer sheets.
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JLneonhug
I think thickness is a mixture of physical measurement and density.
Not to promote wurth, but emc in general - it's about absorbing the right frequencies with the right encapsulation tool.
Ie cans are good for belt and braces approach to damp noise to pass emc. Patches and adhesives are band aidn people didn't design the circuit as well and need to push a product ASAP which needs to pass emc.
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I think thickness is a mixture of physical measurement and density.
Not to promote wurth, but emc in general - it's about absorbing the right frequencies with the right encapsulation tool.
Ie cans are good for belt and braces approach to damp noise to pass emc. Patches and adhesives are band aidn people didn't design the circuit as well and need to push a product ASAP which needs to pass emc.
reply
greatscott
Be mindful of the fact that any wire sticking out of the shield (depending on its length/what it is connected to/frequency) can be acting as an antenna happily radiating the EMC from inside the shield. Also, any slot in the shield that has circumference as long as the waves you are trying to stop is a slot antenna that again can radiate whatever the inside produces. It is indeed a rabbit hole.
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Be mindful of the fact that any wire sticking out of the shield (depending on its length/what it is connected to/frequency) can be acting as an antenna happily radiating the EMC from inside the shield. Also, any slot in the shield that has circumference as long as the waves you are trying to stop is a slot antenna that again can radiate whatever the inside produces. It is indeed a rabbit hole.
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paranoidzkitszo
That SDR was. well, do you think it was a success To lower the amount of interference The tone of your voice did, but the demonstrated spectrograph showed otherwise. oh, I believe you've demo'ed a HRF1 SDR. no But, i see you utilizing a Pluto here Much more expensive without the broad band. i guess the Pluto is full duplex yeahh/ Even 2 HRF1's would be cheaper than a Pluto.
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That SDR was. well, do you think it was a success To lower the amount of interference The tone of your voice did, but the demonstrated spectrograph showed otherwise. oh, I believe you've demo'ed a HRF1 SDR. no But, i see you utilizing a Pluto here Much more expensive without the broad band. i guess the Pluto is full duplex yeahh/ Even 2 HRF1's would be cheaper than a Pluto.
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paranoidzkitszo
put the jammer in the microwave- no silly, don't turn it on. but, do close the door. Duh, the microwave door is designed specifically to do some sorta sheilding of the 2. 4gh frequency and why we don't grow another nose/ go blind starring into the microwave as we do- maybe we know better as. adults. ok, so, as we did when we was just kids.
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put the jammer in the microwave- no silly, don't turn it on. but, do close the door. Duh, the microwave door is designed specifically to do some sorta sheilding of the 2. 4gh frequency and why we don't grow another nose/ go blind starring into the microwave as we do- maybe we know better as. adults. ok, so, as we did when we was just kids.
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chrisw1462
Copper tape is expensive. Better switcher design is much more cost effective. Using a microcontroller so a MOSFET can replace the output diode is a big EMI reducer. Add a properly shielded inductor, too, and you've cut EMI by quite a bit. Cheap consumer electronics makers just don't want to spend the extra 50 cents to make them better.
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Copper tape is expensive. Better switcher design is much more cost effective. Using a microcontroller so a MOSFET can replace the output diode is a big EMI reducer. Add a properly shielded inductor, too, and you've cut EMI by quite a bit. Cheap consumer electronics makers just don't want to spend the extra 50 cents to make them better.
reply
gravidar
Best way to stop a wifi jammer Wires. My cameras and doorbell etc. are all wired PoE, burglars now come equipped with jammers so I want to see a project where these can be detected and my doorbell can broadcast Ahh, that's cute, you're using a jammer. I have a nice photo of you and the household have been notified, you can leave now
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Best way to stop a wifi jammer Wires. My cameras and doorbell etc. are all wired PoE, burglars now come equipped with jammers so I want to see a project where these can be detected and my doorbell can broadcast Ahh, that's cute, you're using a jammer. I have a nice photo of you and the household have been notified, you can leave now
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Richardincancale
One of our C-band (4GHz) satcom links in South Africa showed intermittent problems. Listening with a spectrum analyser and a directional antenna showed an interfering airport radar off one side. A piece of aluminium drinks can and a pair of scissors fixed the problem, shielding feed port on the LNB from that direction!
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One of our C-band (4GHz) satcom links in South Africa showed intermittent problems. Listening with a spectrum analyser and a directional antenna showed an interfering airport radar off one side. A piece of aluminium drinks can and a pair of scissors fixed the problem, shielding feed port on the LNB from that direction!
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yavuzkaganyadigar0
As some EMC test engineer famuosly said if you see shielding all around board, its design is shitty Shielding is brute way to solve problems, best way to solve it is design carefully. do not split ground planes, make sure your capacitor and inductors does not create a resonance circuit, use stiching vias etc.
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As some EMC test engineer famuosly said if you see shielding all around board, its design is shitty Shielding is brute way to solve problems, best way to solve it is design carefully. do not split ground planes, make sure your capacitor and inductors does not create a resonance circuit, use stiching vias etc.
reply
naasking
So for lower frequencies, you need something like iron or steel tape rather than copper tape, due to ferromagnetism. That will absorb and redirect the magnetic fields inside the material. Not sure if that's a thing though. They have stainless steel tape, but stainless steel is not very magnetic.
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So for lower frequencies, you need something like iron or steel tape rather than copper tape, due to ferromagnetism. That will absorb and redirect the magnetic fields inside the material. Not sure if that's a thing though. They have stainless steel tape, but stainless steel is not very magnetic.
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DankoStojanovic
The use of a phone jammer, GPS blocker, or other signal jamming device designed to intentionally block, jam, or interfere with authorized radio communications is a violation of federal law. There are no exemptions for use within a business, classroom, residence, or vehicle- fcc dot gov
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The use of a phone jammer, GPS blocker, or other signal jamming device designed to intentionally block, jam, or interfere with authorized radio communications is a violation of federal law. There are no exemptions for use within a business, classroom, residence, or vehicle- fcc dot gov
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flavioernst902
Really cool video! Please make more of this emc content. For example comparisons between good and bad pcb designs, conducted emi and filtering possibilities, low cost initial testing for first evaluation and how it compares to the real testing. Would love to see more in this direction!
reply
Really cool video! Please make more of this emc content. For example comparisons between good and bad pcb designs, conducted emi and filtering possibilities, low cost initial testing for first evaluation and how it compares to the real testing. Would love to see more in this direction!
reply
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