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 realized my Cardputer ADV could double as an RF field tool, so I wrote this: scan 2.4GHz WiFi and BLE advertising channels, see live RSSI and channel occupancy on the little screen.

Not an SDR (no raw IQ), but if you do RF-over-the-air work this is a handy standalone scanner — it plots channel load and helps spot interference sources / bad channel choices.

• WiFi channel scan, BLE channel scanning, RSSI meter
• Runs entirely on a $25 M5Stack Cardputer ADV, no software needed on the host

Free + MIT: https://github.com/meister5/cardputer-rfscope

Curious what this crowd would want next in it — channel hopping on a timer? VHF/UHF via an add-on radio module?

Hi guys, I have the chance to buy in used condition one of the following SDR dongles, and I'd like your opinion on which one is better (alternatively, please suggest some other beginner-friendly budget SDR).

• Nooelec NESDR SMArt v5
• SDR Nooelec Smartee coupled with Ham it Up Nano
• NESDR Mini TV28T

I'm a beginner and my interest is to be able to explore the widest range of frequencies possible.

Thanks in advance

The new formatting is so much finer than before!

And the Sound improved! I'm really impressed

Today my neoelec sdr arrived and I've tried listening something with the kit antennas. Can somelne tell me where to start or link some source to understand how to hear clearly something?

Hi, ive got myself the rtl-sdr v5 with the ham it up up converter kit to cover a wider spectrum of frequencys.

What would you advice to start with? Are there any videos out there where someone explains the physical behavior(wavelengths, voltages, etc) in combination with the software and the technical terms (like u would learn it on an academic level).

Thank you in advance.

Hey r/sdr,

We just released a video covering our new PZSDR series — two pin-compatible SDR boards built around dual ADI AD9361 transceivers and Xilinx Zynq UltraScale+ SoC

Quick specs:

· 4T4R via 2× AD9361BBCZ

· 70MHz – 6GHz, 200kHz – 56MHz bandwidth

· P401D: XCZU4EV (192K LUTs, 728 DSP)

· P501D: XCZU5EV (256K LUTs, 1248 DSP)

· Both: 4× Cortex-A53 + 2× Cortex-R5, 2GB DDR4, 8GB eMMC

· I/O: 40G QSFP, GigE, USB3.0, Mini DP, SSD, 40-pin expansion, GPS+Beidou + PPS

· 0.1ppm VCTCXO, external clock input supported

· Industrial-grade, ESD protected, 160×150mm

Both boards are hardware and software compatible, so you can prototype on the P401D and scale to the P501D without redesigning.

Full overview video: https://youtu.be/cLrXNKUzjxQ

Website: http://www.puzhi.com

Happy to answer any technical questions in the comments.

Technical inquiries: [support@puzhi.com](mailto:support@puzhi.com)

TLDR: what are people using for their front end software for an sdrplay receiver

I have an sdrplay rsp1b and a decent antenna outside. It is connected to a raspberry pi, and using soapysdr I have used it in the past to listen from a Linux PC using gcrx.

I stopped using it and am back a year later and I cannot comprehend the software sprawl in this space.

Is there a general consensus on a solid front end software for looking at the spectrum and also decent preset support with the ability to scan across the presets (gcrx with a script was great for this sort of like a police scanner)?

It seems like there are so many projects that just came out a month ago rather than a clear strong leader here.

Am I off on that?

FoxSDR.com : new EAS/SAME decoder turns NOAA Weather Radio and Emergency Alert System tone bursts into plain words: event, originator, counties, valid period and station. Because each header is sent three times, it votes across the copies, so alerts survive noise. Presets tune the seven NOAA channels. Receive-only, no county-name table.

if anyone wants a plugin that no one else is offering . simple ask and as long as you are willing to beta test that plugin for and report bugs back . im happy to make it for you

www.foxsdr.com

Built a little project for anyone playing around with the ATS Mini / Si4732 radios.

ATS Mini Controller is a local web interface that controls the physical radio over USB. It gives you a searchable database of 50,000+ shortwave, AM and FM stations, click-to-tune from the browser, live RSSI scanning to find stations that are actually receivable, audio passthrough to your computer, and a live CW/Morse decoder.

The bit I found most interesting was the CW side. It can cycle known CW-heavy frequencies, detect actual keying, lock onto the signal and decode it live in the browser. I ended up writing the audio-to-Morse decoder locally with NumPy/SciPy rather than relying on an existing Morse package.

It’s deliberately local and fairly simple: plug the ATS Mini into USB, run the Python app, open the browser and the radio becomes a much more useful little desktop receiver.

Still early, but it’s open source and MIT licensed if anyone else has one of these radios and wants to have a play:

https://github.com/jsawyerdev/ats-mini-controller

I purchased this board and started testing the phase synchronization between its channels:

HamGeek 70MHz-6GHz 4-Channel Phase Synchronization Receiving SDR Development Board

It contains two AD9363 chips, providing a total of 4 receivers. In my measurement setup, I split the signal into 4 using a power splitter and feed it into these receivers at a reasonable signal level. Using the board's internal calibration, I compare the phase values obtained from all channels, repeating this measurement about 10 times. The phase difference between the channels on the same chip (e.g., A1-A2 or B1-B2) remains constant. However, the phase difference between cross-channels varies by 5 to 10 degrees from measurement to measurement, specifically at frequencies below 2400 MHz. Above 2400 MHz, there is no such issue.

Every time I retune the LO, I run the calibration and check the values. But whenever you jump—for instance, from 1000 MHz to 1500 MHz and back to 1000 MHz—you don't get the same values. There is up to a 5-degree shift on the cross-channels between the initial phase values and the second set.

The board's official description claims a phase accuracy of less than 1 degree, but that seems to be complete nonsense. Trying to reach HamGeek is a total nightmare. When you call, you can't reach anyone. When I try to contact them via WhatsApp or email, they don't even respond or bother looking into the issue.

Has anyone here observed this before? Is there any workaround or solution for this?

Hi!

For my own interest I have, with a LLM built a DVB-T decoder.

I have made great progress with it and it works on my local transmission.

But I want it to be able to decode every type of mode that DVB-T have. So what I'm asking for here is if you would be able to sample about 10s of IQ from your local station? So I can verify that it works on those as well.

There are specific regions that are more interesting than others, to complement my own.

When asking gpt the regions I would need I got this answer

# BW FFT Modulation Code rate GI Where used / known example

-- ----- -------- ---------- --------- ----- -----------------------------------------------

1 5 MHz Any/4K* Any Any Any USA - Crown Castle/Modeo DVB-H, L-band

1670-1675 MHz (historical)

*4K especially wanted

2 6 MHz 8K 16-QAM 2/3 1/4 Taiwan - documented DVB-T configuration

(Taipei and other areas)

3 8 MHz 2K 16-QAM 1/2 1/8 Germany - Berlin/Brandenburg DVB-T

(historical)

4 8 MHz 2K 64-QAM 3/4 1/8 UK / France - early DVB-T networks

(historical)

5 8 MHz 8K QPSK 3/4 1/32 UK - Local TV multiplexes

6 7 MHz 8K 64-QAM 3/4 1/16 Australia - common DVB-T configuration

7 8 MHz 8K 16-QAM 2/3 1/4 Germany - DVB-T SFN configuration

(historical)

8 8 MHz 8K 64-QAM 3/4 1/32 UK - COM4/COM5/COM6 multiplexes

How to sample:

- Please be beware of DC spike.

- Set the gain so the signal is as high it can be before raising the noise floor to much.

- At least +10MS/s samplerate. Sorry RTL-SDR folks 😢

- Note what datatype or header format it uses(or software for recording).

I don't have any great suggestions on where to upload.

I know that some of the modes are historical, but it would be fun if someone had a samplefile of those as well.

Sincerely

Hi everyone,

I wanted to share a deep-tech SDR project I’ve designed and fully implemented. It’s a custom, standalone FPGA + ARM SoC-based HF + 50 MHz SDR transceiver called the XtremeDx H7113R.

My goal was to build a high-performance direct conversion SDR system.

Key Architecture & Hardware Specs:

• Receiver Architecture: Two coherent RF and DDC channels utilizing a hardware-level phasing-add matrix implemented directly inside the FPGA.
• Processing: Dual-core ARM Cortex-A7 (1.2 GHz) dedicated to GUI handling and high-level DSP, paired with a custom FPGA fabric.
• RF Conversion: 2x 16-bit LTC2208 ADC (122.88 MSPS) and 14-bit TxDAC utilizing full LVDS interfaces.
• FPGA-Based Phasing-ADD Mode: A fully hardware-implemented, real-time, running inside the FPGA fabric. It processes the two coherent RX channels, allowing completely independent phase rotation and magnitude scaling per channel.
• Interference Mitigation: CNLMS-based I/Q adaptive noise canceling (tested and validated using the same signal on RF inputs).
• RF Routing: Two completely independent RX RF routing blocks, each integrating a switchable 20 dB preamplifier, 0.5 dB step attenuator, HPF, and direct ADC access via rear SMA connectors for subsampling/custom front-ends.
• Power Amplifier: Delivers 120–140W PEP with 36–38 dB PEP IMD3 linearity across HF + 50 MHz bands.
• Audio DSP: Separate 8-band EQ for both Rx and Tx AF signals.
• Connectivity: High-bandwidth USB 3.0 (FT601) interface for direct FPGA-to-PC streaming (32-bit Sync FIFO implemented in VHDL) + USB 2.0 for ARM-to-PC communication.
• Display: 7" TFT panel running a custom UI with a 70 fps refresh rate. It features 2D/3D spectrum views and a dedicated Polar Plot for the Phasing-ADD and ANC modes, visualizing the real-time magnitude and phase rotation per channel.
• RF Routing and Linearity Performance: By routing the LTC2208 RF ADC without a preamplifier through the RF router, the system yields its maximum dynamic range and IIP3. Additionally, the 20 dB preamplifier maintains high IIP3 and OIP3 performance. With the internal PGA set to 0, the LTC2208 achieves a theoretical IIP3 of +48 dBm in this specific design.

Receiver Sensitivity (MDS Performance):

• CW (100 Hz filter, NR ON): Highly discernible down to -136 dBm (Estimated nominal MDS: -133 to -136 dBm)
• SSB (2.7 kHz filter, NR ON): Distinctly audible down to -126 dBm (Estimated nominal MDS: -123 to -125 dBm)

The Transceiver is fully assembled and functional.

Some details.

https://uprog.blogspot.com/2026/08/xtremedx-h7113r-transceiver.html

We have a serious responsibility to the software we release, but one of our updates has left 52 users stranded. So if your radio isn't being recognised, please download the 0.56 build from our website.

We are still in need of beta testers, with a wide range of radios. If you would like to become one, please go to FoxSDR.com and click "Beta" in the top menu. As a beta tester you are in a good position to get new features added before anyone else. If you need a feature that your current radio stack isn't giving you, or that is buggy, become a beta tester and request it. Beta tester feature requests are our top priority.

I just put on version 1.0.10. The spectrum waterfall is really washed out still, though I think it's maybe better than before. This used to be my job, I was a Geophysicist before I retired, and tweaking data display parameters was an important task, so not being able to make the display "pop" is really frustrating. Everything looks so dim compared to other SDRs or commercial ham rigs will built-in waterfalls. Does anyone have any suggestions, secret cheats?

Hi all PlutoSDR (and chinese clones too) owners. Hope you're doing well.
I made a fork of original Pluto ExtIO, you can get it on https://github.com/Radiomix2000/ExtIO_Pluto
Check readme in root of repo for main changes.

Added:

• RF gain.
• Sample Rate and new SR values.
• RF Filter BW.
• RF Filter BW step for mouse scroll.
• RF Gain type (manual / soft / fast / hybrid).
• Settings are save to .ini file in same dir where Extio_Pluto.dll lays.
• CMakeLists to build with CMake and VS Code.

In build dir is precompiled DLL file.

大家好，
我在考虑购买MLite-880。在购买之前，我想确认它的硬件能力。
在Malahit DSP2上，用户可以轻松地通过USB将宽带I/Q（同相/象限）数据流式传输到PC软件上（如SDR++或HDSDR），以查看频谱/瀑布图，并使用CAT控制同步频率。当DSP2连接到电脑时，它会被识别为USB设备（通常会显示为"Malahit I/Q"或类似名称）。
我想请教MLite-880的拥有者或专家几个问题：

1. MLite-880是否真的支持原始I/Q数据流，以在PC SDR软件上显示瀑布图？还是它仅支持通过USB传输基本的解调接收音频（像一个USB声卡/麦克风）？
2. USB上的CAT控制是否可以用于与HDSDR或SDR++等软件同步频率？
3. 如果有人成功将其设置为计算机的外部SDR设备，能否分享一下你的经验或设置？

感谢你的帮助！

I've been building FoxSDR, a from-the-ground-up SDR receiver app for Windows. It's a complete clean-room implementation — no code 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, vessels, and APRS stations, with plugin-supplied basemap tiles
• IQ recording, bookmarks, scanner, frequency presets
• Windows installer, no telemetry games, no account required

Licensing: free for hobbyist/noncommercial use — permanently, no trial, no activation, nothing withheld. Commercial use needs a paid licence (PolyForm Noncommercial).

Links:

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

Happy to answer questions — feedback very welcome.

I recently purchased and have been using ANTSDR E200 board, but I am currently experiencing an issue with it.

When I compare it side-by-side with a Pluto SDR (equipped with a 0.5ppm TCXO) by generating a 1 GHz LO and a 1 MHz tone, the Pluto produces a very sharp peak with no visible phase noise at the top. However, when I generate the exact same tone using the ANTSDR E200 with the fw-patch firmware and configuration, the resulting signal is much wider and contains noticeable phase noise.

I have attached images for comparison. The first image shows the Pluto's output, and the second image shows the ANTSDR E200's output.

Suspecting the issue might be related to the VCTCXO, I tested it both disciplined and completely undisciplined, but the results were exactly the same. I also lowered the cutoff frequency of the filter by using different capacitor and resistors at the U60 DAC output from 300 Hz to 0.72 Hz, but again, nothing changed.

Resolving this issue is critical for me. When I broadcast the exact same satellite transmission using plutoplayer from gps-sdr-sim, my u-blox receiver fails to lock and track because of this phase noise. Conversely, when using the Pluto SDR (which shares the same chip but has less phase noise), the u-blox receiver tracks it perfectly, and the ⁠dopstd⁠, ⁠carstd⁠, and ⁠prstd⁠ values are highly stable. Should i change vctxo to tcxo ?

Could you please help me understand what might be causing this excessive phase noise and how I can resolve this issue?

Hola a todos, soy Jony (LU7DV).

Hace poco creé un bot gratuito de Telegram que permite configurar alertas inteligentes para que no tengas que estar pendiente del clúster todo el día. Puedes configurarlo para que te avise solo cuando aparezca esa estación o DXCC que llevas tiempo intentando contactar, ya sea en cualquier banda o en una específica.

Intenté publicar algo al respecto aquí hace poco, pero el moderador automático lo elimina constantemente por autopromoción. No cobro nada por esto; simplemente quiero compartir con la comunidad una herramienta que creo que podría ser muy útil para otros aficionados a la radioafición.

¿Alguien podría ayudarme o aconsejarme sobre la mejor manera de compartir esto con el grupo? Pueden encontrarlo buscando "HamProp" en Google, pero evito publicar enlaces directos aquí para respetar las reglas del subforo. 73!

Hey, I love using my little RTL SDR, but using it out and about is annoying (having to have laptop etc). I’m a full time software/hardware dev with a bit of experience bringing hardware and ios apps to market so I thought, hey I’ll make something!

Aims are to make something small around my existing rtlsdr (looking at custom sdr stuff means a lot more certifications + time). Probably a Linux based device + battery + rtlsdr all in one that I can put in my backpack, and have a spectrum analyser shown over Bluetooth to my phone. I’m imagining a Radiacode sort of thing, if my hopes aren’t too high!

Would be awesome to have it give me notifications + recordings if a particular part of the spectrum hits a set amplitude.

I think I’ll probably start with an internal RTLSDR (need to speak to them and see if they sell the raw boards), then later move to something you can just plug in an airspy or sdrplay for those wanting better resolution etc.

Battery life should be about 4-6 hours of constant monitoring with the size I’m aiming at.

Would love to get some feedback, and any other ideas + features?

Not sharing this post as a link because I am not affiliated with the project and know very little about it, but the website is here (and their Github). It is a:

...PowerSDR/Thetis-style software-defined-radio transceiver client in Rust, with pluggable radio backends (SoapySDR, OpenHPSDR, TCI, SmartSDR, Icom LAN, and CAT), an egui GUI, and a cyberpunk theme. It runs as a native desktop application and, from the same binary, as a server that streams the same UI to a web browser over WebSocket. It includes an integrated, persistent logbook, many digital modes like FT8/FT4/FT2 built-in, and TCI and Hamlib rigctld servers so third-party programs like WSJT-X can use it as their radio.

My first impression of the UI is that it looks a lot like OpenHamClock, the putative replacement for the recently-defunct HamClock. It also appears to behave the same; you can run it locally (i.e. on the machine you're actually sitting in front of) or in a client/server mode using your favorite flavor of container. In fact, with the space weather features, satellite tracking, DX cluster ops, and others, it could conceivably replace OpenHamClock (NB: While also not affiliated with that project, I do run OpenHamClock and if you haven't seen it, it's definitely an evolutionary leap forward while not losing sight of what Elwood Downey WB0OEW (SK) was doing).

I'm not of an opinion either way regarding the big push on using Rust for All The Things--OpenHamClock uses nodejs which has its own issues--but even the websites look similar. The dev says this is an early beta and stuff may of course not work (or at least not properly) but this thing promises a LOT of capabilities in one (software) box. I'm in the middle of a household remodeling job so I haven't had time to mess with it myself, but has anyone else taken this thing for a spin?

https://reddit.com/link/1vn5qyi/video/6s8jfsyt04jh1/player

For some reason, My SDRConsole volume got very small and quiet, I tried turn on AGC but it is unavailable with BC-FM mode.

This don't happen with WFM mode and I don't know why, Can anyone help me.

I need some suggestions for portable SDR to bring with me during my holidays. I don’t bring with me any pc, so i would need something standalone that can also pass through customs. I haven’t any HAM licenses. It would be a bonus if it has a screen to see the waterfall.

Thanks to all!

Here is a link to listen to the QO-100 satellite with a frequency stability under 5 Hz after a short AFC lock.

This is highly practical for current OpenWebRX users. The waterfall is very clean and features zoom, NR (noise reduction) filter, squelch, recording, and more.

Go tohttps://on1ms.onlineand click on the "QO-100 en live" link.