Narrowband vs Broadband Noise

[@perumal141]

Demonstration was very good thanks for the video

[@twomorestars]

Always glad to see a new EMC video! Thanks for making this content.

[@MachOneDesignEMC]

Thanks for supporting us. We hope to make more!

[@Xsiondu]

I have no idea what this is about but I'm subscribed

[@MachOneDesignEMC]

Lol. No worries. We only care if the content is interesting to watch or not.

[@koelie17]

Thanks man! Please keep up the good work! Could you maybe one day make a video about using absorbion clambs?

[@MachOneDesignEMC]

Good Idea, Koelie, to do that, I need to buy one first :).

[@baszhao14]

Very good demonstration, thanks.🎉

[@tomasbergh]

Good video!

[@Cydget]

Nice, easy to understand. In your opinion is it reasonable to try to convert a narrow band noise source to broadband by intentionally causing frequency variation? For example if you had a sin oscillator that constantly varied its frequency by 20% all the time to avoid a single narrow band peak and instead have either a sweeping or noisy plateau?

[@Xsiondu]

Are you trying to do jamming? If so it would help to know if you are just trying to be a nuisance or is this for a strategic reasons.

[@Cydget]

@@Xsiondu lol no. I was thinking if would actually be better to have a poor clock frequency for a micro( lots of variation ) if that would improve emc noise levels by not having a peek be so high, or if it would make it worse by essentially having your peek move around.

[@Phizev]

@@Cydget This sounds like poor mans spread spectrum clocking, which purposefully spreads clocking instead of relying on (essentially defective) behaviour. Spread spectrum clocking allows multiple devices to communicate while also maintaining the benefits.

[@MachOneDesignEMC]

What you described is spread spectrum, we have made a video, but recently when I attended the EMC Europe, I attended Prof Bernd Deutschmann's presentation, it was so good, now I think the one I made is not good.... But I think it serves some basics, which we hope to release the video soon.

[@MachOneDesignEMC]

Jamming and RF weapons are hot topic, when I was in this year's UK, US and European conference, such subjects were really popular. I will try to do some videos in the future. Well, thanks for suggesting all these, because it keeps giving us good video ideas.

[@Torito1774]

Nice video, ahnk you. This dirty electricity is the root of all my suffering. I am severely EHS person and I'm trying to understand how to get rid of this kind of noise in my electrical wiring. Do you think using shielded cables would fix my problem?

[@MachOneDesignEMC]

Hi Torito, I think it should be a combination of good grounding and shielding work together to reduce ambient EM noise. The problem we found in the industry is that electricians are not taught about grounding for EMI, they are familiar with the HV safety aspect, but not EMI. Shielding wise, unless you shield the whole house/office, otherwise, I would focus on improving the grounding of the system and use good filters on the mains.

[@Torito1774]

@@MachOneDesignEMC Thank you Mr Zhang. I have shielded the whole house with conductive graphite paint from Yshield. All that shielding is grounded. I also installed some Graham-Stetzer capacitive filters. I want to try some inductive filters connected in series on the main circuit baut I have this weird electrical installation with two phases and no neutral. I measure 133V between each of them and the ground and 230V between the two phases. So all those inductive filters are supposed to work in series with both phase and neutral. What do you think the approach would be in this case please? I would like to measure the frequencies present in my wiring but most spectrum analyzers only go as los as 9 KHz and I need something to cover everything between 1 Hz- 500 MHz. Also i'm not sure haw to connect it to be able to visualize the noise present.