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Comment by donohoe | Hacker News Reader

What I want is a tiny portable bluetooth jammer for those who insist everyone in public must be listening to their music. Sadly they are too clunky to haul around each day.

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If I am not mistaken, this type of jammer can severily affect people with pacemakers. But, as a Brazilian citizen, I can understand the feeling of being forced to listen other's people music.

its myth youre mistaken because that would mean all the wifi devices and normal bt devices will also stop pacemaker. only early version of pacemaker before internet would be affected modern pacemakers have protection as long as you keep a safe 6 inch distance

can you cite the source?

I'd imagine temporary (15 minutes?) disruption would be considered in the design of pacemakers or blood glucose monitors, but if you're using this in close proximity for a long period of time... then wouldn't there be problems?

In a third world country which are the most affected by this, Pacemakers are very rare and if you have one chances are you live in a rich area where you don't live with neighbors who do that. People die before they ever get a chance at having a pacemaker and the very conditions that require it are very rare in those areas in the first place

jamming on 2.4ghz will in no way impact the core function of a pacemaker

yes, the new ones come with BT LE so you can monitor it via your smartphone (yeah really..) but I would not call that 'severely affected'

Unfortunately for me, when I hear music it's from the horrible audio of a cell phone speaker.

It is called "Reggaeton be Gone"[1]. I think the author had too many problems with his neighbor.

[1] https://github.com/ronibandini/reggaetonBeGone

This guy has an open schematic:

https://github.com/cifertech/RF-Clown

You can use their files to make one via a pcb vendor like jlpcb or you can look for someone who has already done that:

https://www.tindie.com/products/ryanyu/rf-clown-v20-esp32-wi...

These "solutions" always seem too broad with too much collateral damage. Would this be doable to do with a directional antenna or something instead, so you could aim at the specific speaker (in your own house) you want silenced?

You will need to use your own

Yeah, I didn't expect Bluetooth jamming to be available as SaaS exactly.

Are they? You can make one pretty easily and sew it into your backpack for added camouflage. I heard.

https://stfu.pankajtanwar.in/

how i even make a clunky one ? need one for a neighbor in 3rd world country with lowest civic sense.

i tried that esp32 that uses nRF24 but it doesnt seem to jam all the time. i heard about hackrf one dont know if its can properly do that.

You can brute-force jam the entire 80MHz range. However, it would require roughly 13dB more power compared to jamming a narrow-band signal.

In theory, you could try to exploit the adaptive frequency hopping that bluetooth does, nudging it to switch to specific bands, which you will then jam; this could save on energy, but I don't know if anybody's done it.

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