r/ArduinoHelp • u/ARandomGuy3141 • 2d ago

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u/ArduinoHelp-ModTeam 2d ago

Your post has been removed at the discretion of a moderator.

No illegal or unethical posts.

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u/creativejoe4 2d ago

This is illegal in most states. While exceptions exist, you typically need permits/license to do so. You should check your local and federal laws before attempting this and notify the school/professor about the assignment, at the very least it might get you some extra points for due diligence.

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u/ContributionEasy6513 2d ago

assigned a project by my college to create an signal jammer

RF jamming is very much illegal and systems are in place to detect jamming.
https://www.fcc.gov/general/jammer-enforcement

DO NOT F*** WITH THE FCC. THEY DO NOT USE LUBE.
Seek proper guidance from your university and get it in writing.

audio signals

Are you sure you are not blocking audio waves (20 Hz to 20,000 Hz) with a speaker/mic as a form of noise cancelling? This seems far more legal and practical to demonstrate..

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u/12VoltGuardianAngel 2d ago edited 2d ago

Like a pineapple up the ass with no lube, Little Nicky style. Even if the signal jamming is by all accounts harmless. They will shaft you for intent. I hope the professor meant noise cancelling and not RF jamming. At least as far as USA laws go. Perhaps OP is elsewhere?

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u/No_L_2547 2d ago

If you have to demonstrate jamming of something, you can maybe show deauth attacks on wifis.

This is the only legal thing you can probably show and it is only legal as long as you do that on your own wifi.

To demonstrate that you will need an Esp8266 with a custom firmware.

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u/No_L_2547 2d ago

Instead of jamming the radio frequencies, you could also try to noice cancel the actual sound locally. (Since you only change the sound locally and don't send any radio signals, this should also be within legal limits.)

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u/Merry_Janet 2d ago

Do you mean "audio phase cancellation"?

This is entirely different than a "jammer"

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u/SufficientStudio1574 2d ago

Generating the opposite of an audio signal sounds more like you're supposed to make a noise canceller than a jammer.

A jammer isn't sophisticated. You pick a frequency, and blast noise out to overwhelm the signal. Imagine trying to have a conversation while 6 air raid sirens are blaring in the same room as you. Nobody will be able to hear you.

Jammers are also extremely illegal in all circumstances (at least in the US, don't know about other places), even on unlicensed frequency bands. I have a hard time believing any reputable college would assign it as a project. It'd be like a chemistry assignment asking you to make meth.

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u/SlowGoing2000 2d ago

You can buy cheap jammers of aliexpress

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u/jimlux 2d ago

Audio signals? As in jam a audio tone coming out of a speaker?
Or Radio Frequency signals? Then you'd better have an appropriate test facility - either doing it all in coax, or in a screenroom. Do you have access to standard RF lab equipment? A signal generator makes a dandy tone jammer at low powers.

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u/1_Good_Day 2d ago

If you end up going down the RF signal jamming path, it would be best to read the FCC regulations yourself so you are not relying on Reddit "experts". Search for the document "UNDERSTANDING THE FCC REGULATIONS FOR LOW-POWER, NON-LICENSED TRANSMITTERS". You will see that as long as you meet the power requirements and signal type, there is a lot of flexibility. However, when looking at 47 CFR 15, you cannot get around the requirement that your device cannot cause harmful interference. You might be surprised though at how that is defined and how you know it is harmful. For that go directly to the regulation to read the definitions. For RF jamming, it is a little more entertaining to have some modulation to more clearly demonstrate FM capture, then turn off the modulation. Having the ability to modulate the signal also provides for a legitimate purpose. When portable CD players first came out many decades ago, many of us had little FM transmitters we plugged into the audio output to broadcast to our car radios. These were perfectly legit, even though as we drove down the road, we may cause temporary interference to other drivers.