Need Advice: Building Effective Bluetooth Signal Jammer/Noise Generator for 15m Radius

Hello colleagues. I need advice on the bluetootch jammer / noise generator. The problem is the quite large bluetootch speaker playing too loud at different times, you can only guess more. I would like to assemble some effective bluetootch signal noise generator that would be effective within a radius of 15m. I am asking for help in building something like this. I've seen all ... such noise generators `` all in one '' but the price is a bit prohibitive, and GSM is not really needed here. Thanks in advance for your help.

Why do you think these devices cost so much?

Bluetooth is the 2.4GHz band, which is the same as WiFi - look under this password, maybe you will find something dedicated only to this purpose and it will be cheaper (which I doubt).

If there is no way out, I'll buy it. I'm an electronics engineer so I thought about building this. I'll look for something else on the web.

You know, the problem with these systems is that they are microwaves. You need a lot of experience in this field to build such devices that work properly "from the hoof". Even the laminate used is relevant at these frequencies. You may find that it works on one laminate and not on another.
The typical, most common FR4 laminate is not very suitable for such frequencies, here you would rather need a ceramic laminate, which is practically unavailable to hobbyists.
Read about the different parameters, e.g. here:
https://elektronikab2b.pl/technika/24727-wply...sc-i-dzialanie-obwodow-drukowani#.WwQkPmcwjDA

It would be necessary to assemble such a jammer from commonly available modules, but it is difficult to say how it will work. Ready modules work rather on specific channels and with a predetermined power, and receive a specific type of signal as input. You would have to find a module that would fully analog input noise and broadcast it at full bandwidth. I don't know if they exist.
If you have time, money and willingness to experiment, then of course the way is clear.
However, I believe that this is a fun activity for a hobbyist who will do it nice, and if not the other will be cool. Where there is a real problem and a specific solution is needed, there is no time for experimentation.

I understand what the matter is. You just have to buy something like that to fulfill its role. I heard somewhere that a microwave magnetron produces a lot of noise at 2.4 GHz. I know that playing with a working magnetron can end in blindness of the experimenter. I'm not going to go that way, but that's how I bring up the topic out of curiosity for opinion.

The magnetron does, it sows at about 2.4GHz, but you will cook from the inside everything that stands on the path of the magnetron wave. So you will not only lose your eyesight.

So it is known that from such a thing as far as possible. Coming back to the noise generator itself, it seemed to me that the matter of building something like this could be simpler than building a transmitter / receiver for this frequency. Selectivity is not important in this case, it is to "spoil the ether" and have some power.

It is worth considering the principle of BT operation, e.g. that it uses AFH and changes the frequency 800x per second.

jarek_lnx wrote:

It is worth considering the principle of BT operation, e.g. that it uses AFH and changes the frequency 800x per second.

I don't quite understand what it is. The point is, at some point, BT uses lower frequencies for communication?

gold-game wrote:

I don't quite understand what it is. The point is, at some point, BT uses lower frequencies for communication?

No, AFH means that BT constantly switches channels avoiding those with high noise levels and you would have to take this into account when planning the jamming method. BT occupies the 2.4-2.4835GHz band divided into 79 channels. For example, if you were to use some integrated PLL on 2.4GHz, you would have to change the frequency frequently enough to make most of the channels unusable, in less time than it takes BT devices to bypass disturbed channels.

I also recently heard a hint to do something like this on a serial bluetootch module with an attached directional antenna and force rotation of the broadcasting channels on this device. All in all, the idea is rather good, but the power of my bluetootch transmitting device would be the key here.

jarek_lnx wrote:

It is worth considering the principle of BT operation, e.g. that it uses AFH and changes the frequency 800x per second.

This is why an "analog" wideband noise generator is the best solution. Unfortunately, this cannot be done on public and cheap BT or WiFi modules.

Pong.Chu wrote:

I once made a microwave synthesizer operating at 4.85 GHz on a regular FR-4 laminate and everything worked as it should, if you do not need very high parameters it will work.

One chip will work, another won't, and it will be difficult to figure out why it isn't working. Therefore, it should be generally assumed that such solutions should rather be avoided.

It is easier to talk to the owner of the loudspeaker or cause him to talk to the appropriate services. Anyway, whether it is bt or not, there is an analog signal somewhere in the device. This one is easier to disrupt. You can also put up a similar loudspeaker and play other music, e.g. Chopin's funeral margin. Works, I checked once.

An exaggerated copy of a person's behavior in the presence of this person - is more effective than all other actions (such a satire-turbo).
This is what Col. @ kortyleski wrote about; funeral march ).

The jammer is used for safety, not against the goofy behavior of others.

Following this logic, together with other friendly neighbors, we wanted to join the event without being invited and thus make them quite embarrassed. Unfortunately, I cannot hide my emotions so well and sometimes more than one rail could fly from the fence