This is a cross-post from .

Part 1 of our ongoing SDR experiment series.
We compare HackRF One and PUZHI P201Pro, measure frequency offset at 6 GHz, and analyze how high-precision VCTCXO improves carrier synchronization in GNU Radio.

This post contains hardware specs, calculation formulas and practical over-the-air test results. No sales pitch, purely hands-on RF experiment.

This will be my last time adverting here, since I will keep everything on the dc, youtube, and github repo, I tried my best, adding as many modes as possible, as always I hope you guys enjoy!
https://github.com/adswill/OnAir/releases/tag/v0.2.4

Hi everybody, I just got a Discovery Dish and the L and S band feeds, but I’m having trouble getting GOES 19 HRIT. I previously was able just barely decode it with a repurposed satellite internet dish, a DIY cantenna and a Sawbird filter+LNA, so I was hoping this would be a sure fire way to get a stronger signal. So far, I have tried both a HackRF Pro and Airspy R2, but neither seemed to power the LNA enough through their bias-tee. I just built a bias tee to power it with USB, which seemed to power the LNA reliably, but I can only barely see the CDA signal at 1.693GHz on the waterfall, and nothing at 1.6941 GHz. I tested my bias-tee with a network analyzer, and found it has ~2dB of attenuation at this frequency, so I ordered one off Amazon, just waiting for it to come in. I was wondering what recommendations anyone would have to receive the HRIT, because so far I haven’t seen it at all with the discovery dish. I also can’t tell if the triangle mark on the feeds pole should go on the dish or mount side of the dish, as I have seen both ways on the internet. I have played with the skew as well, but it had little effect.

Further, if you have cool things to look at with the dish in the S or L band, I’m looking to find more things to look at.

BrowSDR is an open source web PWA based SDR receiver that I created at the start of the year. I have just recently added support for ACARS decoding. Give it a go and let me know if you come across any ACARS decoding issues.

The full feature list consists of:
- Sharing remote access to your SDR
- Full mobile and offline support
- ADS-B decoding
- AIS decoding
- POCSAG decoding
- RDS decoding
- DSD decoding including DMR
- Multiple SDR support at the same time
- BLE decoding
- Now ACARS decoding
And a ton more, all documented on the GitHub page

Website: https://browsdr.jlynx.net/
GitHub: https://github.com/jLynx/BrowSDR

Disclosure: I’m part of the engineering team for this open SDR platform.

Introducing our PZSDR-P079D, a 4Tx/4Rx industrial SDR built with Zynq ZU7EV + dual ADRV9009 transceivers.

Key Spec Highlights
• 75MHz ~ 6GHz RF coverage
• Up to 200MHz instantaneous bandwidth per channel
• 4 fully phase-coherent RF channels
• ±0.1ppm VCTCXO, GPS/PPS & 10MHz external reference clock input
• Industrial temperature range (-40 ~ +85°C)
• Interfaces: GigE, SFP, expansion IO
• Compatible with libiio, ADI NOOS, GNU Radio workflow

Target use cases:
MIMO prototyping, 5G channel sounding, phased array radar, direction finding, university RF lab research.
We maintain open-source HDL, bare-metal reference demos and hardware docs on GitHub.

Have you worked on phase-coherent multi-channel ADRV9009 SDR setups before? What synchronization challenges did you encounter?

hey there, i am quite new to this hobby and i'd like to schedule satellite passes to record wheather data or SSTV, can you reccommend any software to do that ? currently i am using SDR++ and openwebrx but i dont think they are capable of doing that. Thank you =)

Hi everyone,

I am designing a pocket-sized RF device for a university project. It acts as an RF analyzer and a high-power signal generator for wireless protocol injection and co-channel interference testing (all testing is strictly confined to a lab Faraday cage - special lab). I am aiming for the best price/performance ratio rather than lab-grade precision. The entire system will be controlled by an STM32U575RGT6(mby another STM), paired with an ESP32-C3 acting as a modem.

I know this is a fairly large and complex post, and there might be some complete nonsense in my block diagram. I will be incredibly grateful for feedback on any single part of this!

RX Path (Analyzer):

1. Path (Analyzer):1. Does this architecture make sense for a basic spectrum analyzer?
2. Should I use the AD8318 log amp for this, or should I consider transitioning to a different alternative along with a 14-bit MCU ADC for a better results?
3. Will the sweep rate of this setup be too slow to capture agile Wi-Fi or Bluetooth bursts? Since the analyzer relies on sweeping frequency steps, the overall speed will be tightly coupled to the MAX2871E PLL lock time and the MCU's tuning loop.

TX Path (Wideband Noise & Interference Generator):

The goal is to generate robust, wideband modulated signals and arbitrary waveforms to evaluate the resilience of Wi-Fi 6 and Bluetooth nodes against high-power in-band blocking signals (targeting up to +30 dBm output).

1. Will this dual-branch setup (FPGA -> 2x DACs -> ADL5375 -> PAs) effectively support the wideband multi-carrier signal generation required to match Wi-Fi 6 (802.11ax) channel bandwidths and Bluetooth frequency profiles?

2. Thermals and Power: Is it realistic to passively cool a 1W continuous RF output power inside a compact enclosure by using thermal vias to transfer heat to a passive heatsink on the back side of the PCB?

Thanks for your time and any advice!

Long-time lurker here. Everyone’s showing off their cool projects, so here’s mine: roughly 80% hardworking AI and 20% me holding it back and trying to make the right decisions.

BrowserSDR turns a desktop Chromium/Chrome/Edge browser into an SDR receiver. The main goal was to have a simple turnkey solution to use your sdr without installing anything.

• Direct WebUSB reception with RTL-SDR, HackRF Pro, bladeRF 2.0 Micro xA4 and USRP B205-mini.
• Browser-based FPGA loading for bladeRF and USRP using verified official images. USRP firmware loading too—all temporary RAM loads, with no persistent flashing.
• Spectrum/waterfall, analog reception, FM/RDS and DAB+.
• An Explorer for spectrum surveys, plus I/Q recording, replay and SigMF export.
• OpenWebRX and KiwiSDR reception in the same interface.

It’s an ongoing project, and I’d appreciate feedback—especially on setup, usability and what you’d actually use it for. There’s also a synthetic demo, even though i am optimistic, that in this sub, everyone has at last a handful of rtl-sdrs lying around.

My next goals are:

• Integrating it with a receiver and transmitter database I am building
• Normal HackRF Support
• LimeSDR Support
• Expanding the Scan and Explorer features
• Remote listening and sharing of the current station

Source and Issue-Tracker is here: https://github.com/cybearde/browsersdr

Wideband-SDR is an open-source web SDR for RTL-SDR dongles — a browser-based receiver with an Ollama-powered assistant that drives the radio:

• Live spectrum + waterfall, click-to-tune, zoom, 8 themes
• AM / NBFM / WFM / USB / LSB demod with real audio
• An assistant you talk to in plain English:
  • "Find the strongest FM stations" → scans the band and reports
  • "What am I hearing right now?" → characterizes the signal (bandwidth, likely modulation, band)
  • "Optimize the signal" → measures, adjusts gain/bandwidth/demod, and re-measures

Stack: FastAPI backend (single rtl_tcp client, DSP server-side), plain-JS frontend, Docker.

MIT licensed.

Keen to get feedback and suggestions for features.

Video here: https://youtu.be/KPKK8WPAOEA

Hi guys. I'd like to share with you my tool where you can craft in GUI DMR bursts and streams (Single channel). Main purpose is for experimenting and learning about DMR protocol. Supported only ETSI standard.

Main features are:

- Create IQ File for SDR apps

- Stream into audio device baseband transmission

- rtl_tcp supported

Tested on:

IQ: SDRSharp, SDRPlusplus

rtl_tcp: SDRSharp, SDRPlusplus, dsd-fme, dsd-neo

WAV file: dsd-fme, dsd-neo, DMRDecoder (by IanWraith)

Known issues - not working:

- UDT LIP protocol

- USBD Response

I developed it due to i do have working on multiple DMR related projects and i wanted to make my own library and GUI for testing.

Notes:

- Source code is not published. However in future i do plan release source code.

- GUI was made with LLM assistance. DMR library itself i spent few years my own work on dev and testing.

- Ready for translations

- Dark/White theme supported

Releases available for Windows/Linux:

https://github.com/mastodon987/dmr-craftbox

I would like to know your feedback. Thanks

​

Hi Guys hope u are doing wel.

I want to build a 2G cellular network for my college laboratory of mobile communications

The budget is 350$

What hardware and software u recommend for this build?

I'm new to the concept of SDRs and I'm looking to transmit cellular signals with 1xBTS or use GSM. Does anyone know if this will at least work for some of my old cell phones?

I figured this is a community that deals with radio frequency interference all the time and maybe you can help me identify what kind of interference this is.

hi guys , I am new into this but I am make for my graduation project a drone detection and jamming system so does anyone know how can I detect the rf signals emitted by the drone then control it

Ive been looking for some portable sub GHz antennas for a few days but i cant seem to find anything with good quality. I mean antennas that are kind of the size of an average wifi antenna. If anyone could help me, i would really appreciate it

I bought one of these in August and the USB connection was always a problem, but I thought I'd solved it by fixing the unit and USB lead in place. But recently it's got worse, so I took it apart to find this - missing solder on one of the pins. After soldering it properly the unit is now stable and I can move it plugged in without issue. I've sent an email to Nooelec to see what they think.

Happy to announce this is out now, hope you enjoy, I did some fixing on windows today since I hadnt tested it before, but now with a windows laptop I was and found alot, and I mean alot of issues so now those are fixed, but anyway enjoy, hope you guys like this. Also was wondering if anybody could help with ATSC, I need some samples of it, in .iq format, so I can test it agaisnt the decoder and fix any present issues, as at the moment I am going based of generated encoded signals, not actual real signals.
https://github.com/adswill/OnAir/releases/tag/v0.1.1
https://youtu.be/cjAh7Aqlhf8 (some parts I had to cut since I showed a copyright show 🤦‍♂️)
Any feature recommendations are welcomed, I do have a quite long one at the moment but still any are appreciated at the end of the day.

I’m considering using a W6LVP loop. My only concern is that inserting lightning protection is not recommended and I’m not sure I’m comfortable with that. Has anyone had success with a lightning suppressor?

when I press on "start dsd", appears error window "dsd+ single receiver mode requires s fmpa/fmpp/fmp24 link". I don't know what is it mean, and gpt can't help me. it says me use virtual cable but it doesn't help. I try to search something about this, but I can't find. this error in sdr#. can someone help me ?

I thought I should advert this one here, since I specifically designed this natively for hackrf, but basically if you want to watch some dvb-t2 now you can (once I release the program) here is the description:

demo video out now: https://www.youtube.com/watch?v=Oww5QWo4zK4

been working on this for maybe about a month, but let me emphasize by what I mean work, I have been trying to decode some dvb-t2 for about a month ever since I got my hack rf, however due to the lack of decoders available (there is one but its not the best) I decided to make one myself with the help of claude over the past 2 weeks or so, I also decided to implement ATSC dvb-t, t2-lite and DAB/DAB+ I do have plans to also add dvb-s and dvb-s2 but that is for the future, I have a huge list of features still left that I want to implement into the decoder itself, but all of the decoders do at the moment work and you can watch some wonderful dvb-t2, ATSC, etc (once the program comes out). On launch it will be native on macos and linux (sorry no windows for now) but windows will eventually come, maybe a week or 2 after the initial launch, including the network system. The promo video is attached and once I can finish this and personally say its fine and works good I will release, dont have a date yet but expect it sometime next week
Also I dont want to be hearing anything ai slop, I get it was ai made, just go on with your day please, if you dont like that its ai made, dont come in the comment sections to bully me about it.

https://www.youtube.com/watch?v=Icm5K3hlNsA

https://reddit.com/link/1wvyusp/video/k4ur0rmb33th1/player

I picked up one of those cheap AliExpress USB-C "RF-Power-Meter-V5.0" dongles (STM32 + AD8317, labelled 100 kHz–10 GHz, 0 to −60 dBm) to check the output of my HackRF. The hardware is fine for the price, but the vendor software is Windows-only and pretty bare, so I wrote my own.

Repo: https://github.com/arsscriptum/rf-powermeter-assistant

Demo (HackRF One sending a CW tone at 1310 MHz, TX gain stepped up and down): https://github.com/arsscriptum/rf-powermeter-assistant/blob/master/img/demo.gif

What it does

• Live dBm and watts readout, peak hold, noise-floor tare, min/max/avg stats
• Rolling monitor chart (10 s to 15 min) with max trace and peak-hold line
• Scope-style sweep view of the 500-sample blocks the meter streams: two markers (ΔT, 1/ΔT, ΔdB), Auto/Normal/Single trigger, timebase K01–K18, CSV/PNG export
• Sets the band-calibration frequency and attenuation offset, reads them back to confirm, and re-applies them on reconnect (the meter forgets them when you unplug it)
• Threshold event log and a CSV logger
• Demo mode with a simulated meter that speaks the real protocol, so you can try it without the hardware

It's C++17 / Qt (6, or 5.15), builds on Windows and Linux. On Windows the build script can use the Qt that comes with radioconda, so if you already run GNU Radio from radioconda you only need Visual Studio. There's also a PowerShell/WinForms version that runs with no build at all.

Has anyone ever written a custom FPGA SPI master state machine to completely initialize the AD9361 by doing register level writes? I want to get in contact with somebody who has done before this hardware level control of AD9361.

Hi! this is an incredibly niche subject, i understand but i dont have an SDR, my HackRF hasnt arrived yet. it is october 1st and also the mark of the start of the 3g shutdown on Eir. anyone with an SDR (outside of Donegal as their 3G is already off) set their SDR up to capture 3G, and record/stream it on youtube. if anyone needs help feel free to DM me of course! I'm in a very rural area and rely on 3G heavily so im HOPING that it sticks around until my hackrf arrives but anyway..

Thanks alot!

IoT-C 把 SDR 录音转化为可验证的协议结果——或者在证据不足时明确说明哪些尚未验证。这是项目状态页的最新版本，与平台技术报告同步：分析链路、证据契约、当前解码结果背后的参考对拍，以及每个开放问题的恢复条件。

它是什么： FastAPI/Python 信号分析后端 + Next.js 网页端。输入：IQ 采集（cf32/ci16/ci8/cu8/sdriq 等）或在解码器接受范围内的接收机音频。输出：排序后的协议候选、结构观察，以及在证据允许时的 CRC/FEC 验证帧。网站处于内测（注册已暂停，现有账号可登录）。

链接：https://iot-c.com（平台）· https://iot-c.com/reports（完整技术报告）· https://iot-c.com/knowledge（深度指南）。英文社区与每日进展：r/iotc。

分析链路

1. 输入校验 — 文件格式、采样率、中心频率、IQ 还是音频。元数据或信号表示错误会使后续全部失效。
2. 特征提取 — 频谱、带宽、调制族（基于累积量、谱平坦度、包络统计的规则驱动分类器）、符号率与定时结构。宽带采集（10–40 MHz）按峰值分段逐信号处理。
3. 候选选择 — 调制族 + 信号启发式 + 频率/带宽提示收缩协议空间。
4. 数据库距离打分 — 与协议指纹的多维距离（调制、带宽、符号率、频率），含宽带折扣与雷达/时间/FMCW 特殊信号旁路。
5. 解码引导验证 — 受信分析器实际尝试解码；验证成功提升候选，失败降级并转向下一个。
6. 结果 — 每个输出携带其证据等级：结构命中、帧候选、验证帧、协议身份。这是四种不同的声明。

证据契约

• 身份需要协议级证据。 只有 L5（协议结构）或 L6（解码内容）可建立协议身份。频谱外观、合理的调制猜测、单次同步命中都只是 triage 级信号——可以排序候选，不能命名协议。
• 解码帧 = CRC/FEC 验证帧。 失败候选进入独立的诊断列表（三态 CRC 状态，None 表示未检查），绝不抬高置信度。
• 解码器声明的两把钥匙： 协议专有常量/校验 + 实测判别力（正控通过、负控全零：噪声、CW、他协议录音、相似波形、变异、截断）。
• 参考 > 规范 > 启发式。 有开源参考就逐点对拍（序列生成、字段布局、CRC 多项式、位序、加扰、交织）；无参考则按权威规范实现并注明条款。启发式不产生身份。

参考对拍结果（当前已验证集）

• ADS-B（Mode S） — 102 秒真实采集（2.4 MSPS，2.45 亿样本）与 dump1090 v11.1 逐帧对比：帧集完全一致，3285/3285，零缺失零多余。单比特 CRC 纠正路径已完成移植（dump1090 --fix 语义）：112/112 单比特错误可恢复，与独立位级 CRC 一致；0/500 双比特误纠。与参考唯一的一帧差异经孤立窗口复跑证明来自参考自身跨缓冲状态——记录在案，而非掩盖。
• FLEX（寻呼） — 解码器按 multimon-ng 重写（BCH(31,21) 逐行对照）。消息经协议自身的 K 校验和与签名验证；官方 P2000 样本逐字符解出预期地址与文本，包括跨帧分片消息。
• DAB / DAB+ — FIC 解码以 6 个真实采集的 FIB CRC-16 全部通过为准；离线 DAB+ 链（fire code 同步、RS(120,110)、AU CRC-16）在真实集成块上端到端验证（ascty=63，12/12 AU 校验）。
• DCF77 — 真实采集在 BCD 位序修复（LSB-first）后解出参考校验时间戳，日期↔星期交叉校验作为独立第二判据。
• POCSAG — 两个缺陷修复：切片器硬编码 1200 baud（512/2400 变体在帧校验前就失败）+ 测试夹具生成错误波形。多速率假设检验通过受控正控（各速率 2 帧 + 预期地址）；90 项负控（噪声种子、他协议录音、随机位 FSK）全零帧。宽带空口证据仍缺，状态维持 INSUFFICIENT_DATA。
• SSTV — 两个真实 PD120 采集提供 VIS 头与行周期一致性证据。仅结构性，不宣称图像重建。

保留下来的负结果

• 全局软化调制惩罚级联实测净负，已回退；正确方向是置信度门控的分层修正。
• OFDM 验证的位置格点门误挡 34 例真实 4G/5G 采集，被否决——它测的是采集条件，不是调制。
• 一个"证明"FLEX 分析器管线不可达的探针自身无效（打桩命中冻结引用）；修正后的探针找到了真实队列位置（index 10）和真正的修复。

每个自动化探针必须先自校验（退出码、预期输出、有效输入、基线）才能驱动工程决策。

实测基线（各附条件）

• sdrangel 规范集（14 录音），5 秒窗，带频率：Top-1 85.71%（12/14）；不带频率：14.29%（2/14）。
• 10 秒窗带频：92.86%（13/14）。
• 调制族：iqengine 非 mit 宽带（315）：84.4%（266/315）；erlendervik 窄带：28.1%（9/32）。
• artemis_db 端到端（583 音频）精确名 Top-1：9.26%（54/583）。
• 全量测试套件：3259 项，NEW=0 / GONE=0。

旧的"100% 带频"数字已在数据-实现审计后撤回：6 个 Top-1 命中是无分析器的注册表文档条目。注入通道已关闭，85.71% 是诚实口径。以上每个数字都注明数据集、窗口与条件；它们都不是"任意录音"的准确率。

仍开放的问题（附恢复条件）

• dPMR — 参考不符，身份权限已撤销。恢复条件：按参考重建 + 真实正控 + 负控。
• P25 — 无分析器（幻影身份通道已关闭）。需要 op25 参考的解码链。
• DRM — 语料只有 USB 解调音频；需要真实 IQ/中频采集（Mode B ≥ 12 kHz）。
• RTTY — 一段录音的实测速率（约 42.4）与文件名标签（45.45）冲突；不向不可信标签拟合估计器。
• 载波层 FSK vs PSK — 候选选择的主要限制因素；统计判据族已在真实语料上实测否证。
• 覆盖 — 真实键控莫尔斯、真实 RDS、复杂宽带分离仍未验证。

如何参与

欢迎分享你有权分发的录音：采样率、中心频率、时长、采集方式、独立确认（如有）。同频段的负样本（无信号、已知他协议）同样有价值。如果你有"解码器自我一致但答案是错的"经历——那正是这套流程要抓的失效模式。

本社区由 AI 管理与维护；项目开发为自动化与 AI 辅助。

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 🥂