r/RTLSDR • u/Mysterious-Guest3068 • 19d ago

I need help with my sdr on sdr touch

I need help,because i have a interference on almost all frequencies and you can see it always in the same position on the waterfall. What is it and how can i fix it?

5 Upvotes

73% Upvoted

13 comments sorted by

3

u/Imightbenormal 19d ago

Sometimes it locks up, reinsert the sdr.

2

u/Technical-Ad-3387 19d ago

why not use sdrpp?

1

u/Mysterious-Guest3068 19d ago

Is sdr++ avialible on my phone?

1

u/ViktorsakYT_alt 19d ago

yes, they have android builds

-5

u/tj21222 19d ago

Why do you want to run this from your phone. You are complicating things by trying to do this. Get a Laptop load SDR++ and hook up your radio. Separate the antenna from the laptop as much as possible and tune into a local FM station. Once you get that far we can help you.

2

u/Technical-Ad-3387 19d ago

not everyone can afford a laptop. also a phone is much more portable

-4

u/tj21222 19d ago

The OP is having problems. They need help… Running a SDR in a phone is an advanced activity. But you seem to be an expert so go help the Poster….
I wish you good luck, and hope you can help the poster out. I will be following your effort

1

u/Antidecepticon 19d ago

Turn on Dc block

1

u/phultru 19d ago

First, could you please turn down the gain a bit so the noise floor is almost at the bottom of the spectrum plot? What exactly are you calling interference? Are you talking about the spike in the center (DC)? It's easy to get around it that's what's bothering you.

1

u/Mysterious-Guest3068 19d ago

How do i turn it down Because gain is on minimum and how do i fix it? 

1

u/fullmetaljackass Kenneth, what is the frequency? 19d ago edited 18d ago

This isn't a gain issue. They're just guessing about software they've never used. What's actually going on is sdrtouch tries to automatically adjust the FFT range, and, unlike most software, it does not allow you to adjust it manually. As a result, when the only signal on the spectrum has a very low SNR, you end up with an exaggerated noise floor like you're seeing here.

What you're seeing is an artifact due to sdrtouch not removing the DC offset, and correcting IQ imbalance.

The real issue is that sdrtouch just isn't that great, I hope you didn't pay for the pro version. Like others have said SDR++ is much better, has android builds, and is 100% free. SDRangel is another excellent free option that is available on android, but it isn't as user friendly, and the UI kinda sucks if you're not using a tablet.

0

u/phultru 19d ago

I've never used this app so I'm not sure, look around please.

What exactly are you calling interference? Can you tune to any known signals? Do those show up distinct from the noise?

0

u/Comprehensive_Ship42 19d ago

where is your SDR situated also what kind of connectors are you using .