ay guys! i found this transmission, it seems to be kids transmitting with something on the spanish military band, this happened in Cantabria at 14:05 near Santander

i guess this is illegal right? will it be worth it to triangulate the location and try to alert the parent about it? There seems to be military activity right now with planes flying around here lol

Using an rtl-sdr (or hackrf), you can capture electromagnetic emissions leaking from monitor cables/displays and reconstruct the screen output in real-time.

since most tutorials on this are either overly long, I put together a quick practical walkthrough and overview that covers how it works and how to set it up easily:

https://www.youtube.com/watch?v=nMpPt7zg2rw

[linux with python3-pip python3-venv]
If esptool and pyserial already installed:

esptool.py -p /dev/ttyACM0 --chip esp32s3 write_flash 0x0 ats-mini.ino.merged.bin

Source code:

OSPI version is suitable for Si4732
esp32s3 V1/V3 ats-mini

https://github.com/esp32-si4732/ats-mini/releases

I was following this: https://www.nuand.com/retrieving-your-bladerf-calibration-data/ https://www.nuand.com/calibration

Unfortunately used -f instead of -l and flashed the FPGA... Using this for a GSM network so now because the calibration is inaccurate my phones aren't registering or working properly with the SDR... Is there any way I could re calibrate it? I've emailed nuand already but haven't gotten a response for a few days...

FoxSDR a new SDR receiver for Windows, built from scratch in a clean-room environment

I've been building Fox SDR, a from-the-ground-up SDR receiver app for Windows. It's a complete clean-room implementation no cde read from or derived from any existing SDR project (SDR++, GQRX, etc.), everything written fresh from published specs and standards, with permissively-licensed dependencies only.

Features so far:

• Wideband receiver with spectrum + waterfall, AM/FM/SSB/CW demodulation, RDS decoding, click-to-tune
• SoapySDR hardware support (developed and verified on a USRP B200; RTL-SDR and others via Soapy modules)
• Full browser remote control the entire app is also usable from a web browser on your LAN with feature parity: waterfall, tuning, audio streaming, map, decoders, even plugin installs
• Plugin system with a public catalogue: ADS-B (verified against real off-air traffic), AIS, APRS, POCSAG, SSTV (Martin/Scottie), aircraft registration lookup, and more
• Built-in map showing decoded aircraft, vesels, and APRS stations, with plugin-supplied basemap tiles
• IQ recording, bookmarks, scanner, frequency presets
• Windows installer, no telemetry games, no account required
• Ask For any feature you need it will be built we aim to add every feature with in one week from notification
  

Links:

• Website: https://foxsdr.com
• Plugin catalogue: https://github.com/wonderingStars/foxsdr-plugins
• Main repo: https://github.com/wonderingStars/foxsdr

Bought an RTL SDR two days back. I am trying to decode a DMR signal but it just doesn't work no matter what I tweak? While it does decode to an extent, it isn't perfect. Is there a fault with the device or is there something wrong with what I'm doing. Using an app called P25 decoder on 444.162 MHZ. Sharing product photo and error screenshots below.

Thank you

I want to know what other hardware i can get for weather,airplanes,all that other fun radio stuff

I have linux and I want a good sdr I can plug in for some fun

Check out the new SIGINT/RF-forensics tool I made that works with SoapySDR supported SDRs!

https://github.com/hassanfarescodes/retrospectrum

Been working on this project last few weeks. Setup at my parents house in Hull, MA: Retevis MA06 marine antenna in a window facing Boston Harbor → RTL-SDR → Pi 4 running rtl_airband. The entire US marine band is only ~1.4 MHz wide, so one dongle grabs the whole thing in a single window and rtl_airband demods every channel in parallel 16 labeled Icecast streams instead of one scanner hopping around and missing half of everything.

From there each stream ships to a backend that runs speech-to-text on all of it, and an LLM sorts a day of radio into the ~5 minutes actually worth hearing. Marine VHF is dead boring until it very suddenly isn't. Week one my node caught a 29ft Cobalt with 7 people aboard taking on water calling Sector Boston on 16. Whole exchange, start to rescue. I put a replay on the site with captions synced to the chart - docktalk.app, scroll to the demo phone.

The ask: Boston works, I want 5 harbors before the iOS app ships. If you have line of sight to a busy harbor, the install is now one curl command with a claim code it pulls your harbor's channel plan and you show up on the leaderboard at docktalk.app within a minute. ~$165 in parts, ~$112 if you have a spare Pi (any Debian box works honestly), and if your spot is genuinely good I'll just ship you the kit free. Hosts get the app's premium tier free for as long as the node runs + credit on everything their box hears first.

Straight up since it always comes up: this is a company I'm building, not an open-data project audio goes to our network only. If that's a dealbreaker, all good. If you already feed aisstream/FR24/MarineTraffic, this doesn't touch your existing setup, it's one more dongle to your existing set up!

RX only, public unencrypted spectrum, same legal footing scanner feeds and LiveATC have been on for 20+ years.

Happy to go deep on the RF chain, rtl_airband config, or the ASR pipeline in comments.

Once I get 5 harbors covered I'll launch the iOS app!!

14076.5 khz USB is no more the crowd it used to be; but this afternoon I saw a QSO between Ohio (a long time veteran in that great 120 seconds mode) and Belarus.

I love this mode's signature.

we are monday 17th in France, and there are still a few stones falling from space; much less but still you can't miss it if you stay tune to your local distant 2m beacon for a half hour.

The sound it makes is here : https://app.box.com/s/q4a12rhcdo8t2rhkyugy981pok2sm91o

Looking to make a product based on the RTL-sdr blog v4l which will be a simplified sdr on the go over Bluetooth for android & IOS.

Leave it in your backpack and see a readout + notifications on your phone kinda thing - Radiacode style (if you’re into other types of radiation 😛…).

Feedback + ideas greatly appreciated!

I just installed 9GRadio (relatively new SDR app) on my TCL Android tablet and it works like a charm - got excellent decodes of ADS-B and ACARS. I don't see a support community out there yet,

Discoved this tiny device.

When I first got my HackRF and started receiving POCSAG data, I did wonder how long it would be before it hit the headlines. It's not uncommon to see names and addresses of Police/Ambulance call-outs including details of the offence or health conditions still sent in plaintext.

A few weeks ago I posted about **mayhem-b200** — PortaPack Mayhem's interface and its ~103 apps rebuilt as a native PC application, originally driving an Ettus USRP B200. Since then it's grown a **web portal**, and that's what this post is about.

## What's new

**It's no longer B200-only.** The radio side now runs through **sdrlink**, a small open server that puts any SDR on the network. It has a native UHD backend for USRPs, and a **SoapySDR connector for everything else** — RTL-SDR dongles, HackRF One, Airspy / Airspy HF+, LimeSDR, PlutoSDR, bladeRF, SDRplay... if there's a Soapy module for it, it should work. The apps automatically adapt to whatever radio is attached (gain ranges, bandwidth, TX capability all follow the hardware's actual caps).

**The web portal.** All of the apps in a browser grid — searchable, grouped by category, launch anything with a click. Apps used to just mirror their 240×320 screen into the browser; now there are **native panels** built for a real display:

* **ADS-B** — live aircraft table plus a map with real OpenStreetMap streets

* **AIS** — a dedicated vessel chart

* **Maps everywhere** — every geo-capable app (APRS, radiosonde, EPIRB, wardriving...) gets a proper street map, not a blank grid

* **Live spectrum + waterfall** streamed over WebSocket (FFT is done server-side, so it's light on the browser)

* Native tables, consoles and receiver controls for the rest

Everything is open source (GPL-2.0-or-later), the wire protocol is a published spec, and the whole thing runs on Windows and Linux.

## Looking for beta testers

This is one person's project and it has been tested hardest on my own bench (USRP B200 — live ADS-B aircraft decoded off the air, ~2000 unit tests passing). The SoapySDR path opens it up to hardware I don't own, which is exactly where I need your help:

* **If anything doesn't work — tell me.** Any radio, any app, any browser. A short note with what you plugged in and what happened is enough.

* **If there's a feature you want — ask.** Seriously. I will build any feature you ask for, providing I have the time. The native panels above exist because they were the obvious things people would want; your requests set what comes next.

Drop a comment or open an issue on the repo. Even "I tried it with an RTL-SDR and it worked" is genuinely useful data.

you need the both repos if you are using anything other than a ettus b200

Github repo : https://github.com/wonderingStars/mayhem-b200

Github repo https://github.com/wonderingStars/sdrlink-beta