First of all: I'm newbie. :)

I found a radio broadcast that is clearly some kind of digital signal. I would like to figure it out what it is and decode it, at least until I see a string of numbers.
I'm in Europe, if it's important.

What could this be and how would it be worth starting with it?

https://preview.redd.it/99u2wbg8lxge1.png?width=674&format=png&auto=webp&s=358099c38e66357390f099a9f3a70d3e5878146a

I am taking my first steps into signal decoding.

I have a Nooelec SDR and I am trying to decode the signal from an Ener-J Wireless Kinetic Switch.

According to the datasheet, it uses 433MHz and FSK.

Using the Universal Radio Hacker's Spectrum analyser, I get a pulse around 433.918MHz, but it only appears to have one peak. For FSK I'm expecting to see two frequencies.

I guess the datasheet could be wrong, but I'd wager the mistake is my end.

Is there any way to clean up this signal and see if two peaks resolve?

https://preview.redd.it/wmwoj3ehnwge1.png?width=3002&format=png&auto=webp&s=5d833a49438e60e4ced2a86750502ff565120b35

https://preview.redd.it/qux72nfxrvge1.png?width=1366&format=png&auto=webp&s=267e07654cf0ab5bc1e61cd4b1a42ed1205d3a6b

That is actually 600 bps ACARS being decoded with a passive Diamond MR77B VHF/UHF Magmount antenna with no LNA from Norway with Alphasat at 17° elevation.. Conditions must be very good. Probably about time to buy a lottery ticket.

https://preview.redd.it/xi6sye2ftvge1.png?width=2048&format=png&auto=webp&s=ba8eac95937f9db14ad1d1b362c4bda421d1ed57

Jomjom79

An older thread brings this up in "Figuring out the data transmitted by the Motorola T800"... isn't Motorola required by the FCC to publicly document any digital mode before they can start transmitting? I couldn't find anything, but I don't know how to navigate FCC docs. If anyone knows how to do that, it's this community :)

Hi everyone,

I’m looking for some help regarding the SDR-RTL v4. Is there any software that can perform a full scan of the entire FM band (87-108 MHz) and generate a report containing details for all the radio stations detected? Specifically, I’m looking for a report that includes:

• Station Name
• Program Identification (PID)
• Program Service (PS)
• Signal level in dBµV

The goal is to scan the entire FM spectrum and get a comprehensive list of all the stations it picks up, along with these details. If anyone has experience with this or knows of any software that can do this, I’d really appreciate your advice!

Thanks in advance!

Hello, I am looking into getting into monitoring L Band ACARS, I am not able to install a dish, but I can get away with the RTL- SDR L Band patch antenna.  I have a decently clear shot at the Southern Sky from my home I. The outskirts of  the Washington DC area. my receivers are a RSP Duo and DX receiver, and a couple dongles. I have a few decoding programs MultiPSK and Planeplotter for Areo band decodes.

Here is my question am I wasting my time and money on the RTL Patch antenna? 

https://preview.redd.it/o3cuc089lrge1.png?width=1406&format=png&auto=webp&s=2f6af12e585eccd02f163d6d1fc60da7fce504b1

I'm talking about the random humps. It only appears that this frequency range has it. It sounds like OTH radars, but it's a bit wide for that?

https://preview.redd.it/5usp80xcerge1.png?width=312&format=png&auto=webp&s=29388423ff7016028381c2c3329640ed526d318f

Signal received on 9720khz - 5PM GMT. Can anyone identify this just by eye? Cannot find any matches on Sigidwiki.

Can someone please point me in the direction of some good material on Spyserver. I can’t get it to recognize more than one device. I would like to know more about its capabilities along with how to operate it properly.

Is there any way in GQRX to monitor a larger frequency band by "stringing together" multiple SDRs (i.e., SDR #1 monitors 100-102.4 and SDR #2 monitors 102.4-104.8)? Is there any general-purpose SDR software that supports this, or is there some inherent limitation I'm not considering? I can't imagine it would be a processing issue on the computer end given that there are some SDRs which have 10+ MHz of bandwidth.

Can you import from repeater book into SDR++? I've been trying to convert files and stuff but it is NOT working. I can't find anything online about doing something like this except a python script that errors out on the first line due to format issues or something. I don't understand why this isn't a more asked question/any documentation on it. I would guess it's a common thing!

Thanks all

https://preview.redd.it/4os4ldm10oge1.png?width=1830&format=png&auto=webp&s=dd161a6d344025f86cf13cb94a1804925900414e

5.85MHz seems to be a AM signal, but there are some strong signals around it changing every few seconds. What are them?

Just curious since I haven't seen a image with a resistor not being there.

Does anyone know how to delete entries or otherwise manage the list of url's that build up in the Airspy Server netowrk? I'm referring to these sdr://173.190.0.79:5557/ Thanks in advance.

So i got my self a HackRF One for christmas ! Im into all kinds of tinkering from programming to 3d printers to ethical hacking, arduinos, esp's .. just name it , i probably enjoy it ! ;) So logically i had to get some RF stuff to try :)

I may not live in the best place for playing around with RF, since i live in a small 1500 people town in the middle of nowhere :) But im thinking we still must have some intersting signals or things i could explore with the HackRF One, but uncertain about some things.

First thing that came to mind is the box on my water intake, it has some wireless features and it reports my usage wirelessly (even tough its a bit illegal, i opened the box to see what was inside, but i could not find any sim card or mobile chipset) so i was thinking if it would be possible to find that signal and read it with the hackrf one , or if i would just be wasting time on trying that..

Then there are keyfobs and rf locks, however there is only 1 rf lock in town as far as i know, at least outside.. And my next neighbour is 50m away or some and not often home, so even though those things are cool and maybe i try them someday, i just dont have things to simulate a setup for those things to try here at home.

I thought about trying something like making a gsm basestation at home since i have few old phones and it would not bother any neighbours, same thing with GPS jamming, but im not quite sure about the brodcasting range for the hackrf and i kinda dont wanna try those untill im sure it will not reach my neighbours ( police are no issue, since people would just expect it's me messing around, but i still dont wanna bother people too much with my experiments ;)

However, there is one pretty interesting "target" to explore in town, we are the home base for our costguard (we dont have a navy) and they park their boat here, and im not sure what was from the boat and what was from the surroundings, but with a spectrum analyzer a lot seemed to be going on, and a lot less when the boat was gone few days later.

I just did a quick passive walk by, cause there are a lot of cameras there and im pretty sure it's very illegal if i start probing them activly.. But any ideas if they are brodcasting anything interesting ;) ?

Then we have 3 weather stations and 1 or more earthquake detectors that im pretty sure just brodcast unencrypted data, so im thinking those might be usefull to fetch and use for my home server for my local weather..

However, today in 2025 .. What are people doing interesting with their HackRF One ? And are there any antennas you guys feel are a must have , i only have the one that came in the box

can anyone tell me what are the correct settings to create a movie (video) in wxtoimg i tried several times but its comes out as 0 second videoish file which i cant play.
can anyone give me full settings and how to do it please...

https://preview.redd.it/kz1pu48tmmge1.png?width=408&format=png&auto=webp&s=5249a2aa8a4ccc641075b101097fca0c8196dc7d

Hello everyone!

Few weeks ago, I purchased an Wideband Ultra Low-Noise Amplifier (LNA) with Bias T which has been working flawless. I just purchased the Ham It Down downverter which also has bias T and was wondering if using both of these on one single RTL with bias T on would cause issues? Currently testing the Ham It Down with a different RTL dongle but was wondering if there will be any issues using the Bias T with on? Or should i use an USB on both modules and not use Bias T?

Any suggestions and feedback is welcomed!

Ham It Down - https://www.nooelec.com/store/sdr/sdr-addons/upconverters-downconverters/ham-it-down.html

LNA - https://www.nooelec.com/store/sdr/sdr-addons/rf-blocks/lana.html

I have the above error when trying to use the plugin. I have put the .DLL file in the plugin location but it keeps coming up. Anyone help please?

I’m looking to design a (relatively) low-cost <1GHz interferometric radio astronomy array (baselines in the kilometre range) making use of RTL-SDR Blog v4s and Raspberry Pi 3Bs in each antenna module. The data will be sent over Wi-Fi to my PC for post-processing once the data is collected.

However, I’m worried that this might be infeasible simply because of the difficulty of precisely correlating the signals. I have considered several different approaches to resolving this, but they either seem significantly too complex or too expensive. As of now, my two most promising ideas have been:

1. Transmit a short, high-power CW signal that can be picked up by all antennas at the start of a measurement from a base station. This could allow for each data signal to be cross-correlated in post-processing using the falling edge of this control signal and accounting for the known geometric distance between antennas.

2. A mixture of GPS-PPS and GPSDO modules to regulate the system clock of the RPis and to stabilise the internal clock of the RTL-SDR dongles. The signals would be timestamped locally on the Raspberry Pis.

Both of these seem to have their own pros and cons that are making me doubt the feasibility of a project like this. Does anyone have experience cross-correlating SDRs over long distances or know how I could potentially get around this in post-processing?

I was wondering if there was any way that i could use the rtl sdr to read the tv signals and display them on the screen, I am mainly interested in downloadable free apllications that work straight away with very little setup. Any help would be much appreciated.

P.S i am using DVB-T not DVB-T2

Hey r/rtlsdr I was wondering if there are any terrestrial tv signals in sydney that can be detected via an rtlsdr v3 and if so what frequencies and what will I need. Sorry for the short question I'm a bit of a noob and will accept any help.

Thanks alot!

Hey guys, i am very new to this scene so i apologize in advance if any of the questions i ask are simple. I have found at my office the security staff has walkie talkies, and managed to sneak a picture of one. Its a Motorola and on the screen it says Ch2 Digital. On the actual antennae it says UHF. I have a RTLSDR v4 with the set of antennas included. Ive set it up on an rPi running OpenWebRX+ and it is running fine. Now id like to know when i am in the office what frequencies should i be looking out for, or if i need to program something separate into Openwebrx to access UHF? Thank you

Thinking about integrating Pico 2 and AD9363 ($30 on LCSC), for a low-end narrowband "SDR". That or MCP37D20 ($2 or $20) to make a low cost IF sampling receiver, very flexible with it's NCO/DDC, 200 MHz sample rate and 80 dB SNR. This is just for context, the concern here is selecting a host interface for data transfer. Pico 2 can easily sample a 25 MHz parallel port, that limits max IQ rate to 12.5 MHz.

The convenient option is 10/100 ethernet which limits the IQ rate to 2.5 MHz (16-bit) / 5 MHz (8-bit). Or try something exotic like implementing ULPI on Pico 2 to interface a USB HS (480 Mbps) PHY. That could do ~10 MHz IQ (16-bit), maybe.

So the question for users here, would 2.5/5 MHz be enough for most applications? Higher bandwidths are possible for analysis use (bursty), not continuous demod.

Hello everyone, I have some pretty annoying RFI I can't figure out where it comes from, it alternates every second
I use a MLA30+ 10m away from my pc, connected to an RTL SDR V4

at 2693MHz : https://vocaroo.com/1oeoxWkMpN5k

at 8494MHz : https://vocaroo.com/18DGYDdTPYHI

https://preview.redd.it/frzgy8i58ege1.png?width=1500&format=png&auto=webp&s=27db5d7f6189cdd4b4ed4daab2c4ce80ccc83644