RTLSDR

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A subreddit for the low-cost software defined radio (SDR) community. While originally dedicated to the [RTL2832U USB rtl-sdr project, relevant content related to general SDR, RF, and similar projects are also welcomed.

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Using a Nooelec SmarTee and getting these periodic wide band dips in signal strength (blue bars). I assume it's something wrong with my SDR. Is that a power issue or something? (lemmy.world)

submitted 9 months ago by [email protected] to c/[email protected]

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[–] [email protected] 2 points 9 months ago (1 children)

It’s a USB3 port and I think the only peripheral on the bus, so I guess I’m lucky. Thanks for the examples. I’ll keep an eye out for those.

As far as your point about the SNR is that because oversampling only reduces read noise, but can’t actually reduce the noise present in the air? (Been a ham for 9 years, but still new to SDR)

[–] [email protected] 1 points 9 months ago

The USB3 won't make a difference. It's actually a hardware issue with the rtl2832u in the SDR that causes the drop. I'm not sure why one controller is OK, but that's what I've heard.

I'll be honest that I don't really understand why oversampling helps. But as far as I know it only increases the dynamic range, and if you don't have a large difference between the weakest and strongest signals you are receiving there isn't any benefit. And also, yeah, the environmental noise is probably way higher that the ADC noise.

If you've been a ham for 9 years, you probably know more about this than me. I've been into radio/SDR for about 1.5 years now, and I've mostly just done satellite stuff in that time.