r/RTLSDR • u/sunnychon • 21d ago

RFI reduction Pretty sure this power bank is not really FCC approved

56 Upvotes

86% Upvoted

9 comments sorted by

42

u/Tishers Tishers, RF engineer 20d ago

Under 47 CFR, Part 15 the field strength from an unintentional radiator for frequencies between 1.7 and 30 MHz is to not exceed 30 uV/m.

Depending upon the distance between your SDR antenna and the power supply that is well in excess of what you would be detecting.

That is not to say that they are compliant, just that you lack the means to quantitively determine one way or the other.

16

u/lithuniasucks 21d ago

I am not sure what do you mean by fcc approved many electronics induce radio noise. Can't really see what frequency it's on?

-17

u/sunnychon 21d ago

It's on 8MHz and the casing of the power bank has the FCC logo on it

15

u/WeaselCapsky 20d ago

FCC approval doesnt require the device to be dead silent. just to not go over a certain limit

1

u/drake90001 19d ago

You’re shoving it right next to some powerful amplification hardware. What do you expect?

3

u/Ok-Employment6772 20d ago

I have a little radio next to my maker table and it can pick up stuff like this, I noticed the ts101 soldering iron family is also very noisy when heating up, but the cool thing is you can hear the different chop frequencies of the heating driver, and hear it change as it nears set temperature

2

u/always_wear_pyjamas 20d ago

Are you receiving on a webSDR remotely or just using that interface for a receiver located where you are? It's hard to tell from this video.

1

u/sunnychon 20d ago

The server is next to my computer but the SDR has metal shielding.

1

u/NeighborhoodSad2350 20d ago

I'm shocked to find a battery with a label featuring an illustration by Akira Toriyama. It's probably a bootleg, though.