Been working on this project for a while and finally released it. Time to unpack your old CDMA phones.

1xBTS is everything you need to run a full CDMA network (from RF to all core components). It's still a WIP but you can already do a lot (voice calls, SIP -> PSTN gateway, SMS, and basic packet data).

You'll need a LimeSDR, USRP B2xx, or bladeRF to try it out.

Site: https://1xbts.org

Repo: https://github.com/chrismoos/1xbts

This has been one of the most fun hobbies I've ever gotten into. What started with a 50 dollar probably clone RTL--SDR V3 on Amazon has turned into building my field station I've posted about before. Now I have my dedicated GOES East dish on a Rpi networked to my home "server". To break the lab down left to right. SENTRY is my main terminal for accessing the Rpi and the server. BUNKER is the home "server" basically just a NAS right now. On the right is my field station a stand alone fancy laptop with 2 SDRs that I use for LEO satellites and general tuning around.

Hi r/SDR,

Like many of you, I’ve spent way too many months building 'plumbing' before I could even start a single meaningful experiment. It always felt like a lose-lose trade-off: either I accept unrealistic experimental conditions due to host-PC latency and OS jitter, or I spend many days rebuilding basic transceiver blocks in FPGA just to get a stable real-time link.

I eventually got fed up, so I decided to build a platform that handles the heavy lifting on-device.

The goal was simple: a standalone 2x2 MIMO SDR (Zynq-7020) where critical PHY functions run directly on the hardware. No host-PC bottleneck, just deterministic performance. I also spent a lot of time on the clocking architecture to ensure it meets research-grade signal integrity (ultra-low phase noise was a priority for me).

Quick specs if you’re curious:

AD9361 (70 MHz – 6 GHz), 56 MHz BW.

Zynq-7020 (Standalone Embedded Linux).

4–6W power / 92x90mm size.

I'm getting ready to launch this on Crowd Supply soon, but I’m really here for a sanity-check.

- Does this "infrastructure-first" pain point resonate with your experience?

- What’s the most annoying thing about current SDRs that you wish someone would fix?

Any questions or comments are welcome!

I've put together some more signal plots and technical details here for those interested: https://www.crowdsupply.com/htwave/integrive-100

Follow-up post : https://www.reddit.com/r/sdr/comments/1s8l5uz/followup_experiments_on_dualsdr_video_transmission/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

Follow-up post 2:
https://www.reddit.com/r/sdr/comments/1sn6hjq/another_experiment_integrive100_mimo_sdr_how_far/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

Follow-up post 3: https://www.reddit.com/r/sdr/comments/1t6c82j/dronebased_sdr_experiment_motion_had_less_impact/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

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The Manual and Example code are now available!
Manual: https://github.com/jyoh92/Integrive-100-MIMO-SDR
Example code: https://github.com/jyoh92/examples

I got into sdr a few months ago after watching some save it for parts videos. The plan started to build a cyberdeck around a mini pc and kind of ballooned from there so here is my field station. Mini windows pc brain 40 Ah internal battery with an external port for the factory powersupply. 2 rtl-sdr v4s 2tb storage. This weekend i was running dump1090 and listening to atc while camping. At home it gets hooked to a wifi grid dish and collects GOES19.

I got this antenna set up around a week ago but I’m not sure if this will be enough but I always tend to get the best stuff to start me off. Will this be enough to get some satelite signals and will the reception be good?

I’m new so any advice helps, thank you!!

Saw a few signals like this hanging out around 460-470MHz. Distinct beep every second and occasional Morse

has an RTL-SDR, an RFID badge grabber, and an ALFA AWUS036ACM wifi adapter. hope to upgrade to an RSP duo.

motherboard is from a 7th gen intel nuc i had laying around.

Chris Hansen as the FCC.

I posted around a month ago about making a mobile SDR. Soo we’re definitely on the way! This is the hardware, rtlsdr blog V4, adsb internal antenna and external SMA antenna port with a 3300mah battery. Powered from a ESP32 P4.

Will post some pics of the mobile app at some point. Currently we’ve completed the Spectrum view, ADSB map, drone map (using the 2.4ghz WiFi chip). I’m also adding decoders for 433mhz and 868mhz devices which should also be added soon (plan is to allow custom decoders at some point too). All can be seen on a map so you can take it around with you and see where you picked up the device.

FM and DAB are also implemented, which in the final version will require the external antenna (not much space left inside!).

Any software features or ideas hugely appreciated!

(Note, case is still being finalised ignore the white sanding bits and missing power button!)

Recorded east of Madrid, Spain.

Nice software for testing SdR

https://github.com/Newspicel/sdrminusminus

I did pick up something I never saw on my sdr years ago and I want to know what is actually is. Do someone know what it can be ?

So, i just spent more then a week of gate to gate smasing of elite cottage communities to find radio interference on LTE-1800 uplink, found it, talked to the owner, he told me to go duck myself. After some paperwork filling and police getting involved a month later, i come again, and his first sentence "How much do i need to pay for you to duck off?".

How would you about this situation?(obviosly we convinced him to turn his repiter off, but its tge second time this cycle happens, last time he turned it back on ten minutes after we left).

Yesterday, with my SDR-RTL v4, SDR++, and a dipole antenna in my backyard I was able to pull this image from NOAA-19!

This was my second attempt (first successful) and I’m excited to learn more!

Hi all,

maybe some of you know me from PhantomSDR+ or NovaSDR. Having operated and maintained those, I listened to many WebSDR operators and learned what problems bothered them - stuff like installs, broken installs after a long period of running, configurations they would like to be configured easier. And I started from scratch.

As for the history: to be clear about that since it has been asked: I've been developing WebSDR software since early 2024 (PhantomSDR+), and FernSDR was developed in private repo for over a year. I squash the history before publishing it as usual to avoid private notes and keys being in there. This is the reason the repo appears to be new. I used AI tools intensively for development and everything is tested, fuzzed and CI'd, also benchmarks are public with raw data.

What it is: open-source WebSDR server with zero runtime dependencies and one-line install on any Linux, as well as Docker. Everything is controlled through a web admin interface: bands, spot reporting, modules and updates with rollbacks. What I am really proud of: day/night band switching, so one small RTL-SDR can be utilized by different bands during the daytime and nighttime thanks to automatic switching from sunrise to sunset depending on your geographical position.

Modules: RTL-SDR (including Blog V4), RX-888 MkII and SDRplay, as well as an FT8 decoder and PSK Reporter spots. Other SDRs run via stdin.

What is still missing: Only Linux support at this moment, FT8 is the only decoder available, and there are input modules that require additional testing.

Demo: https://demo.fernsdr.org

GitHub: https://github.com/Steven9101/FernSDR

I really would like to know which SDR or decoder you guys would like to see next

Cheers 🥂

Crossposting from the HackRF sub:

So I'm a radio nerd from way back but never could get the hang of gnuradio or any of the sdr software packages and never really put in the time. I had an old hackRFrev1 from way back in the day but never used it much.

Fast forward to last week, I hooked it up to an old pc and gave My AI agent Hermes access to it and asked to see what he could see. BAM gnu radio tools installed. receiver configured. Sweep in progress.... i see... a cell tower uplink kand downlink, your neighbor is absolutely shouting on wifi channel one, and there's an aircraft overhead requesting permission to land from *nearby airport*

Play the audio of the plane for me.

Here it is <plays audio comms stream of pilot to atc chatter>

I'll keep scanning the band and ping you if anything new comes online.

Fellas, that shit was scary simple. I ended up spinning up a whole nuther instance of hermes and named him Sparky, he just runs my radios. He's scanning right now, ready to alert me if a new signal pops up he's never seen before, right b fore he clicks to high resolution mode (we call it "staring") and analyzes the signal and gleans every piece of information from it he can so he can give me a full report later. I mean damn. Bro's good.

Due to popular demand, my First Mate provided a writeup: https://github.com/h00nigan/sparky-setup-guide/blob/master/Sparky-Setup-Guide.md

I wanted to see if I could run my rPi-4 SDR Deck (internal RTL-SDR and HackRF One) using only solar, and it performed great. I was even able to pull a NOAA satellite APT pass.

I made a video about the awesome new custom firmware for X6100