Software-defined radio (SDR) is a radio communication system where components that have been traditionally implemented in hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a personal computer or embedded system.
Experimenting with software defined radio used to be expensive, but now it is cheap. Nowadays it is very cheap to start experimenting with SDR. Most receivers use a variable-frequency oscillator, mixer, and filter to tune the desired signal to a common intermediate frequency or baseband, where it is then sampled by the analog-to-digital converter. Cheapest wide receiving range well working device is to use suitable DVB-T receiver stick (10-20 Euros/Dollars) and suitable software (very many alternatives, for example SDRsharp and Gnu Radio).
My article Software defined radio with USB DVB-T stick started the long list of SDR related postings. The newest postings now are Filter measurements with RF noise source and Antenna measurements with RF noise source.
432 Comments
Tomi Engdahl says:
https://hackaday.com/2021/12/03/this-ham-radio-is-unsafe-at-any-frequency/
Tomi Engdahl says:
Is The Game Up For Baofeng In Europe?
https://hackaday.com/2021/12/05/is-the-game-up-for-baofeng-in-europe/
For radio enthusiasts worldwide, the inexpensive Chinese handheld radios produced by the likes of Baofeng and other brands have been a welcome addition to their arsenal. They make an ideal first transceiver for a new licensee, a handy portable for any radio amateur, and an inexpensive basis for UHF or VHF experimentation. Unfortunately with the low cost comes something of a reputation for not having the cleanest spectral output, and it seems that this has caught the attention of regulators in Germany and Poland. In Germany this has resulted in the announcement of a sales prohibition (PDF in German) which seems likely to be repeated across the rest of the EU.
It seems what has happened is that the quality of the Baofeng radios on sale doesn’t match that claimed in their conformity documents, which should honestly come as a surprise to nobody. It is interesting that the paperwork mentions the Baofeng UV-5R specifically, as it seems likely to us that an inevitable game of whack-a-mole will ensue with the same radios appearing under ever more brand names and part numbers.
Tomi Engdahl says:
Ham Radio SSB Transceiver Fits In Pocket
https://hackaday.com/2021/12/09/ham-radio-ssb-transceiver-fits-in-pocket/
Tomi Engdahl says:
Four Band Digital HF SDR Transceiver Offers High Performance For Only $60
https://hackaday.com/2021/12/08/four-band-digital-hf-sdr-transceiver-offers-high-performance-for-only-60/
Amateur radio is a hobby that is often thought of as being exclusive to those with a healthy expendable income. In recent years however, the tides have turned. Cheap microcontrollers and signal generators have helped turned things around, and the $60 USD QDX from QRP Labs goes even further by sending the performance/price ratio through the roof. You can see more details in the video below the break.
The QDX is the creation of [Hans Summers] who is well known for producing affordable high performance amateur radio kits that are focused on low power transmission, called “QRP” in ham radio parlance. What is it? It’s a pocket sized four band (80, 40, 30, 20 Meters) software defined radio (SDR) that is designed to be used with some of the most popular digital radio modes: FT8 and JS8Call, as well as any other FSK based mode such as RTTY. It’s also been tested to work well (and within spec) on 60 Meters.
https://qrp-labs.com/qdx.html
Tomi Engdahl says:
Increasing SFDR in Software-Defined Radios
April 29, 2021
The SDR is destined to become the receiver architecture of choice in most systems and the ADC, with its continually increasing sampling rates and instantaneous bandwidth, will be a key driver of its success. Still, there’s the issue of spurious emissions.
https://www.electronicdesign.com/technologies/analog/article/21211658/increasing-sfdr-in-softwaredefined-radios
What you’ll learn:
The integral role of software-defined radios in today’s RF design.
Why is an analog-to-digital converter such a key factor in SDRs?
How to minimize SFDR to maximize ADC performance with a novel technique.
Of the most important technological advances in receiver technology over the last 20 years, two stand out: software-defined radio (SDR) and direct RF sampling. The SDR has almost completely redefined how transceivers are designed and constructed, allowing manufacturers to use a common hardware platform to serve multiple product lines by reconfiguring it in software even after being deployed, without hardware changes.
In one important way, direct RF sampling has made the SDR possible, as it digitizes the analog input signal as near as possible to where it enters the receiver. This achievement is realized by the analog-to-digital converter (ADC), whose performance affects how well the entire receiver will perform. However, neither the ADC, nor optimizing it, are simple, so it’s important to understand how to tame some of its more undesirable side effects.
In a traditional heterodyne architecture (Fig. 1), after the receiver picks up the signal at RF frequencies, it downconverts it to a lower intermediate frequency (IF), where it’s digitized, filtered, and demodulated. In contrast, a direct RF-sampling receiver (Fig. 2) consists of only a low-noise amplifier, a bandpass filter, an anti-aliasing filter, and an ADC. It eliminates the need for mixers and local oscillators because it digitizes the RF signal directly, eliminating many analog components and their inherent nonlinearities.
The Importance of the ADC
In any receiver, high performance can only be obtained when its signal-to-noise ratio (SNR) and spurious-free dynamic range (SFDR) are very high, both being attributes directly related to the ADC. So, for designers, the goal is to optimize ADC performance, in part by mitigating its negative characteristics.
While the ADC’s sampling rate, bandwidth, SNR, and effective number of bits (ENOB) all play key roles, SFDR is perhaps the most important metric. SFDR, defined as the ratio between the fundamental tone and the largest harmonically or non-harmonically related spur in the bandwidth of interest, effectively determines the usable dynamic range of a receiver.
Unfortunately, an ADC introduces quantization, offset, gain, linearity, and timing errors that create spurious signals in its output that have a negative effect on SFDR. These signals can interfere with signals of interest, compromising their data and causing, among other things, high bit-error rates and distortion to the point where the desired signals are compromised or hidden by the spurs and go undetected.
Unlike the desired signal, spurs aren’t affected by analog filters earlier in the signal path; rather, they can appear at any frequency in the ADC sample’s frequency range. They can also occur at frequencies well beyond the ADC sampling frequency and then be aliased down to frequencies below the sampling frequency.
Various types of compensation have been developed to address these errors, but they make only modest improvements to SFDR while having other drawbacks. For example, adding a dither signal adds noise at a level greater than the nominal quantization-step size. However, out-of-band noise dithering reduces the dynamic range of the ADC and increases phase noise. Commutating the ADC at lower rates introduces interleaving spurs, another source of errors.
What about ADC calibration as a remedy? Unfortunately, an ADC is extremely sensitive to temperature, limiting its use to stable temperature environments. This is problematic in an aircraft or even many industrial environments
The latest technology created to tackle the ADC dilemma is dubbed the High Dynamic Range Receiver (HDRR), created by Precision Receivers. It delivers an increase in SFDR of up to 16 dB by reducing ADC-induced spurious signals to levels previously unachievable
HDRR uses an advanced clocking and sampling approach that mitigates the spurs and the resulting intermodulation distortion while also preserving the signal’s original phase and amplitude as measured at the antenna. It can be used in any receiver regardless of its ADC manufacturer, at any frequency of interest, without the need for calibration, while reducing analog components and the complexity of anti-aliasing filters.
Because HDRR doesn’t introduce dithering and there’s no added phase distortion, it can easily deliver a time- or frequency-domain series at user-specified, low-latency update intervals. To achieve its results, HDRR uses information available from the analog-to-digital conversion process that’s encoded in the HDRR clocking method. After the process is completed, the clocking information can be applied to segregate Nyquist information from multiple zones, which keeps the desired frequencies in-band and rejects the out-of-band frequencies.
Tomi Engdahl says:
#345: Generating AM and DSB-SC with a Double-Balanced Diode Ring Mixer / Modulator
https://www.youtube.com/watch?v=KBq0sblnHWs
This video answers the viewer question I received about how to generate AM (Amplitude Modulation) using a double-balanced diode ring mixer – in other words, how to use it as an AM Modulator. The question arose from three other videos:
Basics of Diode Ring Mixers:
https://youtu.be/junuEwmQVQ8
Basics of the Gilbert Cell:
https://youtu.be/7nmmb0pqTU0
Generating DSB-SC and AM with a Gilbert Cell:
https://youtu.be/38OQub2Vi2Q
Video Notes:
https://www.qsl.net/w2aew/youtube/DSB-SC_AM_DBMixer.pdf
Tomi Engdahl says:
https://hackaday.com/2021/12/22/frame-antenna-works-the-low-bands/
Tomi Engdahl says:
https://hackaday.com/2022/01/06/ham-antenna-fits-almost-anywhere/
Tomi Engdahl says:
How self-powered flashing phone stickers worked (with schematic)
https://www.youtube.com/watch?v=fVmLyladBy8
These used to be all the rage in the 90′s at the peak of Nokia’s phone dominance. They were stickers that you could put on your phone, and they would collect some of the RF energy and use it to make some LEDs flicker. It was quite interesting, because it showed when your phone was randomly checking in with a remote tower, even when not being used for a call.
The circuitry is very simple, but the diodes may be a high speed RF type. The diode packages I’ve spotted so far have been labelled C1, C3 and C2L.
In an echo of the anti-5G hype there was also anti-2G, 3G and 4G (and in the future the same people will be anti-6G). Sometimes these stickers were aimed at those people and sold as radiation absorbing stickers, but in reality INCREASED the amount of RF they were exposed to.
I’ve not had any luck getting the stickers to work on a modern phone. That may be because of the different frequencies, or simply the much reduced power that is needed to communicate with the local low-power beacons that have mostly replaced the older high power masts.
Tomi Engdahl says:
https://hackaday.com/2022/01/13/impedance-matching-revisited/
Tomi Engdahl says:
https://hackaday.com/2022/01/13/microwave-sampler-is-like-time-domain-mixer/
Tomi Engdahl says:
Raspberry Pi Detects Malware Using Electromagnetic Waves | Tom’s Hardware
https://www.tomshardware.com/news/raspberry-pi-detects-malware-with-em-waves
Raspberry Pi can now detect malware without any software | TechRadar
https://www.techradar.com/news/raspberry-pi-can-now-detect-malware-without-any-software
Tomi Engdahl says:
https://hackaday.com/2022/01/21/affordable-hf-loop-antenna-reviewed/
Tomi Engdahl says:
https://hackaday.com/2022/01/21/directional-antenna-3-way/
Tomi Engdahl says:
Radio Amateurs & Skywatchers Rejoice, Sat Operators Worry: Solar Storm Incoming
https://hackaday.com/2022/02/01/radio-amateurs-skywatchers-rejoice-sat-operators-worry-solar-storm-incoming/
[Dr. Tamitha Skov], the so-called [Space Weather Woman]. When she says something is on the way we listen, so a recent Tweet predicting a direct hit from a solar storm with a good probability of auroras in lower latitudes is very much worth sharing.
https://twitter.com/TamithaSkov/status/1488225078798008320
Tomi Engdahl says:
Another small efficient matching transformer for an EFHW – 2643251002
https://owenduffy.net/blog/?p=21901
Tomi Engdahl says:
Homemade Panadapter Brings Waterfall To Old Radio
https://hackaday.com/2022/02/20/homemade-panadapter-brings-waterfall-to-old-radio/
Ham radio operators can be pretty selective about their gear. Some are old-school tube purists who would never think of touching a rig containing transistors, and others are perfectly happy with the small Software Defined Radio (SDR) hooked up to their PC. The vast majority, though, of us are somewhere in between — we appreciate the classic look and feel of vintage radios as well as the convenience of modern ones. Better yet, some of us even like to combine the two by adding a few modern bells and whistles to our favorite “boat anchor.”
[Scott Baker] is one such Ham. He’s only had his license for a few months now and has already jumped into some great projects, including adding a panadapter to an old Drake R-4B Receiver. What’s a panadapter, you may ask? As [Scott] explains in his excellent writeup and video, a panadapter is a circuit that grabs a wideband signal from a radio receiver that typically has a narrowband output. The idea is that rather than just listen to somebody’s 4kHz-wide transmission in the 40m band, you can listen to a huge swath of the spectrum, covering potentially hundreds of transmissions, all at the same time.
Well, you can’t actually listen to that many transmissions at once — that would be a garbed mess. What you can do with that ultrawide signal, however, is look at it. If you take an FFT of the signal to put it in the frequency domain (by using a spectrum analyzer, or in [Scott]’s case, an SDR), you can see all sorts of different signals up and down the spectrum.
Adding a panadapter to a Drake R-4B Ham Radio Receiver
https://www.smbaker.com/adding-a-panadapter-to-a-drake-r-4b-ham-radio-receiver
Tomi Engdahl says:
Reverse Engineering A 900 MHz RC Transmitter And Receiver
https://hackaday.com/2022/02/20/reverse-engineering-a-900-mhz-rc-transmitter-and-receiver/
For those building their own remote controlled devices like RC boats and quadcopter drones, having a good transmitter-receiver setup is a significant factor in the eventual usability of their build. Many transmitters are available in the 2.4 GHz band, but some operate at different frequencies, like the 868/915 MHz band. The TBS Crossfire is one such transmitter, and it’s become a popular model thanks to its long-range performance.
Tomi Engdahl says:
RF Path and Absorption Loss Estimation for Underwater Wireless Sensor Networks in Different Water Environments
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4934316/
Tomi Engdahl says:
AVOIDING FAKE RTL-SDR BLOG V3 CLONES + 2021 SUPPLY CHAIN UPDATES
As a follow on to the previous post on fake SDRplay units, we also wanted to provide some guidance on fake RTL-SDR Blog V3 clones which are on the market. We are starting to receive an increase in support requests for fake RTL-SDR Blog V3 units. Please be aware that we cannot support these devices, and most of them are missing key features like the bias tee and the TCXO despite advertising these features on the listing and writing on the dongle body. Also as mentioned below a good majority of them appear to have a defect and poor performance.
https://www.rtl-sdr.com/avoiding-fake-rtl-sdr-blog-v3-clones-2021-supply-chain-updates/
Tomi Engdahl says:
https://fuzzthepiguy.tech/rtl-sdr-com/
Tomi Engdahl says:
The Battlefield That’s 5 KHz Wide
https://hackaday.com/2022/03/04/the-battlefield-thats-5-khz-wide/
The airwaves are full of news from the battle in Ukraine, with TV and radio journalists providing coverage at all hours. But for those with a bit of patience there’s something else from the conflict that can be found with a radio receiver, the battle over 5 kHz of spectrum starting at 4625 kHz. This has for many years been the location on the dial for “the Buzzer“, a Russian military transmitter whose nickname describes its monotonous on/off buzzing transmission perfectly. As the current Ukrainian situation has taken shape it has become a minor battleground, and the Buzzer now shares its frequency with a variety of other stations broadcasting music, spectrograms, and other radio junk intended to disrupt it.
The Russian mystery signal known as “The Buzzer” on 4625 kHz. And detractors on the same channel, in the form of voices, music and waterfall images.
https://twitter.com/kaedotcom/status/1497711396196433929
Tomi Engdahl says:
https://en.wikipedia.org/wiki/VHF_omnidirectional_range
Tomi Engdahl says:
https://hackaday.com/2022/03/12/ice-fishing-tent-makes-winter-ham-radio-comfy/
Tomi Engdahl says:
https://hackaday.com/2022/03/17/owning-a-shortwave-radio-is-once-again-a-subversive-activity/
Tomi Engdahl says:
The SOCORAD32 Is an Arduino-Compatible Software-Controlled Radio Walkie-Talkie, Driven by an ESP32
Designed to be accessible yet flexible, the SOCORAD32 offers compatibility with off-the-shelf walkie-talkies powered by the same radio IC.
https://www.hackster.io/news/the-socorad32-is-an-arduino-compatible-software-controlled-radio-walkie-talkie-driven-by-an-esp32-6696746f6955
Tomi Engdahl says:
https://hackaday.com/2022/03/22/satellite-snoopers-pick-up-surprising-tv-broadcast/
Tomi Engdahl says:
https://hackaday.com/2022/03/30/wind-up-tape-measure-transformed-into-portable-ham-antenna/
Tomi Engdahl says:
A Gang Of HackRFs Makes For A Wideband SDR
https://hackaday.com/2022/04/01/a-gang-of-hackrfs-makes-for-a-wideband-sdr/
[Oleg Kutkov] decided to build a wideband SDR – for satellite communication research and monitoring, you know, the usual. He decided on a battery of HackRF boards – entire eight of them, in fact. Two 1×4 and one 1×2 RF splitters and an LNA on their combined RF input made for a good start to the project, and from there, it only got more complex.
HackRF boards can be synchronized with a separate clock source, but you can’t just pull a single clock line to all of them in a star configuration. Thus, he’s built a clock distribution and amplifier board, with 4 ns propagation delay at 1 PPS, and only 10 ns delay at 10 MHz. Then, he integrated that board with the HackRF setup, adding a case, wiring up a purpose-built cable and dealing with the reflections that occurred.
HackRF boards are USB 2.0 and able to generate a stream of data up to 320 MB/s, and there’d be no viable way to aggregate eight 2.0 links into one. To solve that, he’s used eight separate PCI-E to USB 3.0 cards, each of them with one HackRF plugged in, all connected to an AMD Ryzen 9-powered PC through PCI-E risers we typically see used for mining purposes.
HackRF SuperCluster
https://olegkutkov.me/2021/11/29/hackrf-supercluster/
Tomi Engdahl says:
Just In Case You Want To Charge Your Neighbor’s Tesla
https://hackaday.com/2022/04/08/just-in-case-you-want-to-charge-your-neighbors-tesla/
Tesla vehicles have a charging port that is under a cover that only opens on command from a charging station. Well, maybe not only. [IfNotPike] reports that he was able to replay the 315MHz signal using a software defined radio and pop the port open on any Tesla he happened to be near.
Apparently, opening the charging port isn’t the end of the world since there isn’t much you can do with the charging port other than charging the car. At least, that we know of. If history shows anything, it is that anything you can get to will be exploited eventually.
Apparently, it was as simple as record and replay to get the sesame to open. However, if you are too lazy to get to do your own recording, GitHub can help you out.
TIL: Tesla’s charging ports use a standard wireless message to open up on 315MHz…
https://twitter.com/IfNotPike/status/1507818836568858631
jimilinuxguy /
Tesla-Charging-Port-Opener
https://github.com/jimilinuxguy/Tesla-Charging-Port-Opener
Files for HackRF + Portapack MAYHEM firmware to open any and all Tesla vehicle charging ports in range!
Move this folder to the root of your SD card and run them with the “Replay” app
Tomi Engdahl says:
SDR Listens In To Your Tires
https://hackaday.com/2022/04/09/sdr-listens-in-to-your-tires/
[Ross] has a 2008 Toyota Tacoma. Like many late model cars, each tire contains a direct tire pressure monitoring sensor or TPMS that wirelessly sends data about the tire status to the car. However, unlike some cars, the system has exactly one notification to the driver: one of your tires is low. It doesn’t tell you which one. Sure, you can check each tire, but [Ross] had a different problem. One sensor was bad and he had no way to know which one it was. He didn’t have any equipment to test the sensor, but he did have an RTL-SDR dongle and some know-how to figure out how to listen in on the sensors.
The key was to use some software called RTL-433 that is made to pick up these kinds of signals. It is available for Linux, Windows, or Mac, and supports hundreds of wireless sensors ranging from X10 RF to KlikAanKlikUit wireless switches.
Diagnosing Toyota TPMS sensors with rtl_433
https://www.r-c-y.net/posts/tpms/
My 2008 Toyota Tacoma is equipped with a direct tire pressure monitoring system (TPMS). This system consists of four wireless sensors (one at each wheel) and an onboard control unit which receives and monitors data from the sensors. The TPMS in this truck is not very advanced. The only information the system provides to the driver is a warning light. It has no way to indicate which tire has low pressure. Currently, one of the TPMS sensors is broken. I know because even when my tire pressures are correct, the TPMS warning light on my dashboard flashes while starting up then stays constantly illuminated. I’d prefer to only replace the broken sensor, and I don’t have a tool to diagnose TPMS sensors. So how do you determine which has failed without buying an expensive TPMS diagnostic tool? I have a RTL-SDR dongle hanging around, so I decided to use rtl_433 to capture and decode signals from the TPMS sensors in order to determine which has failed. This article will describe the process, present some things I learned, and provide a rough guide for someone wanting to do the same thing.
merbanan /
rtl_433
https://github.com/merbanan/rtl_433
Tomi Engdahl says:
rtl_433
rtl_433 (despite the name) is a generic data receiver, mainly for the 433.92 MHz, 868 MHz (SRD), 315 MHz, 345 MHz, and 915 MHz ISM bands.
https://github.com/merbanan/rtl_433
It works with RTL-SDR and/or SoapySDR. Actively tested and supported are Realtek RTL2832 based DVB dongles (using RTL-SDR) and LimeSDR (LimeSDR USB and LimeSDR mini engineering samples kindly provided by MyriadRf), PlutoSDR, HackRF One (using SoapySDR drivers), as well as SoapyRemote.
rtl_433 is written in portable C (C99 standard) and known to compile on Linux (also embedded), MacOS, and Windows systems.
= Supported device protocols =
[01] Silvercrest Remote Control
[02] Rubicson Temperature Sensor
[03] Prologue, FreeTec NC-7104, NC-7159-675 temperature sensor
[04] Waveman Switch Transmitter
[06]* ELV EM 1000
[07]* ELV WS 2000
[08] LaCrosse TX Temperature / Humidity Sensor
[10]* Acurite 896 Rain Gauge
[11] Acurite 609TXC Temperature and Humidity Sensor
[12] Oregon Scientific Weather Sensor
[13]* Mebus 433
[14]* Intertechno 433
[15] KlikAanKlikUit Wireless Switch
[16] AlectoV1 Weather Sensor (Alecto WS3500 WS4500 Ventus W155/W044 Oregon)
[17] Cardin S466-TX2
[18] Fine Offset Electronics, WH2, WH5, Telldus Temperature/Humidity/Rain Sensor
[19] Nexus, FreeTec NC-7345, NX-3980, Solight TE82S, TFA 30.3209 temperature/humidity sensor
[20] Ambient Weather F007TH, TFA 30.3208.02, SwitchDocLabs F016TH temperature sensor
[21] Calibeur RF-104 Sensor
[22] X10 RF
[23] DSC Security Contact
[24]* Brennenstuhl RCS 2044
[25] Globaltronics GT-WT-02 Sensor
[26] Danfoss CFR Thermostat
[29] Chuango Security Technology
[30] Generic Remote SC226x EV1527
[31] TFA-Twin-Plus-30.3049, Conrad KW9010, Ea2 BL999
[32] Fine Offset Electronics WH1080/WH3080 Weather Station
[33] WT450, WT260H, WT405H
[34] LaCrosse WS-2310 / WS-3600 Weather Station
[35] Esperanza EWS
[36] Efergy e2 classic
[37]* Inovalley kw9015b, TFA Dostmann 30.3161 (Rain and temperature sensor)
[38] Generic temperature sensor 1
[39] WG-PB12V1 Temperature Sensor
[40] Acurite 592TXR Temp/Humidity, 5n1 Weather Station, 6045 Lightning, 3N1, Atlas
[41] Acurite 986 Refrigerator / Freezer Thermometer
[42] HIDEKI TS04 Temperature, Humidity, Wind and Rain Sensor
[43] Watchman Sonic / Apollo Ultrasonic / Beckett Rocket oil tank monitor
[44] CurrentCost Current Sensor
[45] emonTx OpenEnergyMonitor
[46] HT680 Remote control
[47] Conrad S3318P, FreeTec NC-5849-913 temperature humidity sensor
[48] Akhan 100F14 remote keyless entry
[49] Quhwa
[50] OSv1 Temperature Sensor
[51] Proove / Nexa / KlikAanKlikUit Wireless Switch
[52] Bresser Thermo-/Hygro-Sensor 3CH
[53] Springfield Temperature and Soil Moisture
[54] Oregon Scientific SL109H Remote Thermal Hygro Sensor
[55] Acurite 606TX Temperature Sensor
[56] TFA pool temperature sensor
[57] Kedsum Temperature & Humidity Sensor, Pearl NC-7415
[58] Blyss DC5-UK-WH
[59] Steelmate TPMS
[60] Schrader TPMS
[61]* LightwaveRF
[62]* Elro DB286A Doorbell
[63] Efergy Optical
[64]* Honda Car Key
[67] Radiohead ASK
[68] Kerui PIR / Contact Sensor
[69] Fine Offset WH1050 Weather Station
[70] Honeywell Door/Window Sensor, 2Gig DW10/DW11, RE208 repeater
[71] Maverick ET-732/733 BBQ Sensor
[72]* RF-tech
[73] LaCrosse TX141-Bv2, TX141TH-Bv2, TX141-Bv3, TX141W, TX145wsdth sensor
[74] Acurite 00275rm,00276rm Temp/Humidity with optional probe
[75] LaCrosse TX35DTH-IT, TFA Dostmann 30.3155 Temperature/Humidity sensor
[76] LaCrosse TX29IT, TFA Dostmann 30.3159.IT Temperature sensor
[77] Vaillant calorMatic VRT340f Central Heating Control
[78] Fine Offset Electronics, WH25, WH32B, WH24, WH65B, HP1000 Temperature/Humidity/Pressure Sensor
[79] Fine Offset Electronics, WH0530 Temperature/Rain Sensor
[80] IBIS beacon
[81] Oil Ultrasonic STANDARD FSK
[82] Citroen TPMS
[83] Oil Ultrasonic STANDARD ASK
[84] Thermopro TP11 Thermometer
[85] Solight TE44/TE66, EMOS E0107T, NX-6876-917
[86] Wireless Smoke and Heat Detector GS 558
[87] Generic wireless motion sensor
[88] Toyota TPMS
[89] Ford TPMS
[90] Renault TPMS
[91] inFactory, nor-tec, FreeTec NC-3982-913 temperature humidity sensor
[92] FT-004-B Temperature Sensor
[93] Ford Car Key
[94] Philips outdoor temperature sensor (type AJ3650)
[95] Schrader TPMS EG53MA4, PA66GF35
[96] Nexa
[97] Thermopro TP08/TP12/TP20 thermometer
[98] GE Color Effects
[99] X10 Security
[100] Interlogix GE UTC Security Devices
[101]* Dish remote 6.3
[102] SimpliSafe Home Security System (May require disabling automatic gain for KeyPad decodes)
[103] Sensible Living Mini-Plant Moisture Sensor
[104] Wireless M-Bus, Mode C&T, 100kbps (-f 868950000 -s 1200000)
[105] Wireless M-Bus, Mode S, 32.768kbps (-f 868300000 -s 1000000)
[106]* Wireless M-Bus, Mode R, 4.8kbps (-f 868330000)
[107]* Wireless M-Bus, Mode F, 2.4kbps
[108] Hyundai WS SENZOR Remote Temperature Sensor
[109] WT0124 Pool Thermometer
[110] PMV-107J (Toyota) TPMS
[111] Emos TTX201 Temperature Sensor
[112] Ambient Weather TX-8300 Temperature/Humidity Sensor
[113] Ambient Weather WH31E Thermo-Hygrometer Sensor, EcoWitt WH40 rain gauge
[114] Maverick et73
[115] Honeywell ActivLink, Wireless Doorbell
[116] Honeywell ActivLink, Wireless Doorbell (FSK)
[117]* ESA1000 / ESA2000 Energy Monitor
[118]* Biltema rain gauge
[119] Bresser Weather Center 5-in-1
[120]* Digitech XC-0324 temperature sensor
[121] Opus/Imagintronix XT300 Soil Moisture
[122]* FS20
[123]* Jansite TPMS Model TY02S
[124] LaCrosse/ELV/Conrad WS7000/WS2500 weather sensors
[125] TS-FT002 Wireless Ultrasonic Tank Liquid Level Meter With Temperature Sensor
[126] Companion WTR001 Temperature Sensor
[127] Ecowitt Wireless Outdoor Thermometer WH53/WH0280/WH0281A
[128] DirecTV RC66RX Remote Control
[129]* Eurochron temperature and humidity sensor
[130] IKEA Sparsnas Energy Meter Monitor
[131] Microchip HCS200/HCS300 KeeLoq Hopping Encoder based remotes
[132] TFA Dostmann 30.3196 T/H outdoor sensor
[133] Rubicson 48659 Thermometer
[134] Holman Industries iWeather WS5029 weather station (newer PCM)
[135] Philips outdoor temperature sensor (type AJ7010)
[136] ESIC EMT7110 power meter
[137] Globaltronics QUIGG GT-TMBBQ-05
[138] Globaltronics GT-WT-03 Sensor
[139] Norgo NGE101
[140] Elantra2012 TPMS
[141] Auriol HG02832, HG05124A-DCF, Rubicson 48957 temperature/humidity sensor
[142] Fine Offset Electronics/ECOWITT WH51, SwitchDoc Labs SM23 Soil Moisture Sensor
[143] Holman Industries iWeather WS5029 weather station (older PWM)
[144] TBH weather sensor
[145] WS2032 weather station
[146] Auriol AFW2A1 temperature/humidity sensor
[147] TFA Drop Rain Gauge 30.3233.01
[148] DSC Security Contact (WS4945)
[149] ERT Standard Consumption Message (SCM)
[150]* Klimalogg
[151] Visonic powercode
[152] Eurochron EFTH-800 temperature and humidity sensor
[153] Cotech 36-7959, SwitchDocLabs FT020T wireless weather station with USB
[154] Standard Consumption Message Plus (SCMplus)
[155] Fine Offset Electronics WH1080/WH3080 Weather Station (FSK)
[156] Abarth 124 Spider TPMS
[157] Missil ML0757 weather station
[158] Sharp SPC775 weather station
[159] Insteon
[160] ERT Interval Data Message (IDM)
[161] ERT Interval Data Message (IDM) for Net Meters
[162]* ThermoPro-TX2 temperature sensor
[163] Acurite 590TX Temperature with optional Humidity
[164] Security+ 2.0 (Keyfob)
[165] TFA Dostmann 30.3221.02 T/H Outdoor Sensor
[166] LaCrosse Technology View LTV-WSDTH01 Breeze Pro Wind Sensor
[167] Somfy RTS
[168] Schrader TPMS SMD3MA4 (Subaru)
[169]* Nice Flor-s remote control for gates
[170] LaCrosse Technology View LTV-WR1 Multi Sensor
[171] LaCrosse Technology View LTV-TH Thermo/Hygro Sensor
[172] Bresser Weather Center 6-in-1, 7-in-1 indoor, new 5-in-1, 3-in-1 wind gauge, Froggit WH6000, Ventus C8488A
[173] Bresser Weather Center 7-in-1
[174] EcoDHOME Smart Socket and MCEE Solar monitor
[175] LaCrosse Technology View LTV-R1, LTV-R3 Rainfall Gauge, LTV-W1/W2 Wind Sensor
[176] BlueLine Innovations Power Cost Monitor
[177] Burnhard BBQ thermometer
[178] Security+ (Keyfob)
[179] Cavius smoke, heat and water detector
[180] Jansite TPMS Model Solar
[181] Amazon Basics Meat Thermometer
[182] TFA Marbella Pool Thermometer
[183] Auriol AHFL temperature/humidity sensor
[184] Auriol AFT 77 B2 temperature sensor
[185] Honeywell CM921 Wireless Programmable Room Thermostat
[186] Hyundai TPMS (VDO)
[187] RojaFlex shutter and remote devices
[188] Marlec Solar iBoost+ sensors
[189] Somfy io-homecontrol
[190] Ambient Weather WH31L (FineOffset WH57) Lightning-Strike sensor
[191] Markisol, E-Motion, BOFU, Rollerhouse, BF-30x, BF-415 curtain remote
[192] Govee Water Leak Detector H5054, Door Contact Sensor B5023
[193] Clipsal CMR113 Cent-a-meter power meter
[194] Inkbird ITH-20R temperature humidity sensor
[195] RainPoint soil temperature and moisture sensor
[196] Atech-WS308 temperature sensor
[197] Acurite Grill/Meat Thermometer 01185M
[198]* EnOcean ERP1
[199] Linear Megacode Garage/Gate Remotes
[200]* Auriol 4-LD5661 temperature/rain sensor
[201] Unbranded SolarTPMS for trucks
[202] Funkbus / Instafunk (Berker, Gira, Jung)
[203] Porsche Boxster/Cayman TPMS
[204] Jasco/GE Choice Alert Security Devices
[205] Telldus weather station FT0385R sensors
[206] LaCrosse TX34-IT rain gauge
[207] SmartFire Proflame 2 remote control
[208] AVE TPMS
[209] SimpliSafe Gen 3 Home Security System
[210] Yale HSA (Home Security Alarm), YES-Alarmkit
[211] Regency Ceiling Fan Remote (-f 303.75M to 303.96M)
[212] Renault 0435R TPMS
[213] Fine Offset Electronics WS80 weather station
[214] EMOS E6016 weatherstation with DCF77
[215] Altronics X7064 temperature and humidity sensor
[216]* ANT and ANT+ devices
[217] EMOS E6016 rain gauge
Tomi Engdahl says:
Stereo FM Transmitter Circuit using IC BA1404
https://www.homemade-circuits.com/make-this-stereo-fm-transmitter-using/
The circuit relies upon the IC BA1404 from ROHM Semiconductors.
BA1404 is a monolithic FM stereo modulator which includes integrated stereo modulator, FM modulator, RF amplifier circuitry.
The FM modulator could be controlled from 76 to 108MHz and power source for the circuit could be nearly anything between one.25 to three volts.
Tomi Engdahl says:
https://flipperzero.one/
Tomi Engdahl says:
Charles Brain Puts NVIDIA’s Riva to Work Transcribing Radio with a LimeSDR and GNU Radio
https://www.hackster.io/news/charles-brain-puts-nvidia-s-riva-to-work-transcribing-radio-with-a-limesdr-and-gnu-radio-743d4078fda1
Using a GPU to accelerate the task of accurate speech-to-text transcription, this rig tunes in to FM radio stations with ease.
Amateur radio software developer Charles “G4GUO” Brain has been experimenting with blending the worlds of software-defined radio (SDR) and machine learning, feeding NVIDIA’s Riva speech recognition system with FM radio signals from GNU Radio.
Using a LimeSDR open-hardware software-defined radio dongle connected to desktop system, Brain has written a GNU Radio flow graph, which tunes the SDR into an FM radio station, demodulates the signal into audio, then feeds the audio into Riva — NVIDIA’s GPU-accelerated speech recognition and transcription model.
The result: an automatic transcript of whatever is transmitted. Providing, at least, you have a powerful enough system. “I tried using it on a [GeForce] RTX 2080 Super [graphics] card,” Brain explains, but it gave loads of out of memory errors. So the […] example is running on an RTX 3090 with 24G[B] of memory.”
Tomi Engdahl says:
https://www.hackster.io/dilshan-jayakody/modularized-narrowband-fm-receiver-653d86
Tomi Engdahl says:
Experimental narrowband FM receiver for 2-meter band
http://jayakody2000lk.blogspot.com/2022/05/experimental-narrowband-fm-receiver-for.html
This project is about MC3362 and ADF4351 based modularized, 2-meter narrow band FM receiver. In this design, the receiver splits into three modules as RF preamplifier, MC3362 tuner, and ADF4351 oscillator. The RF preamplifier builts around BF900 dual-gate MOSFET. The tuner stage builts using the popular MC3362, low power narrowband FM receiver IC. For the oscillator, we use the ADF4351 DDS RF signal generator module
Tomi Engdahl says:
https://hackaday.com/2022/05/21/a-receive-antenna-switcher-with-an-espressif-brain/
Tomi Engdahl says:
VR Spectrum Analyzer
https://hackaday.com/2022/05/21/vr-spectrum-analyzer/
At one point or another, we’ve probably all wished we had a VR headset that would allow us to fly around our designs. While not quite the same, thing, [manahiyo831] has something that might even be better: a VR spectrum analyzer. You can get an idea of what it looks like in the video below, although that is actually from an earlier version.
The video shows a remote PC using an RTL dongle to pick up signals. The newer version runs on the Quest 2 headset, so you can simply attach the dongle to the headset. Sure, you’d look like a space cadet with this on, but — honestly — if you are willing to be seen in the headset, it isn’t that much more hardware.
https://github.com/manahiyo831/VR_RTLSDR_AVATAR
Tomi Engdahl says:
https://www.mwrf.com/technologies/systems/article/21242051/mathworks-algorithms-to-antennas-simulate-and-track-targets-in-terrainbased-scenarios?utm_source=RF+MWRF+Today&utm_medium=email&utm_campaign=CPS220520047&o_eid=7211D2691390C9R&rdx.ident%5Bpull%5D=omeda%7C7211D2691390C9R&oly_enc_id=7211D2691390C9R
Tomi Engdahl says:
Homebrew Radio Telescope Bags Pulsar
https://hackaday.com/2022/05/25/homebrew-radio-telescope-bags-pulsar/
https://jgeheniau.wixsite.com/radio-astronomy/pulsar
Tomi Engdahl says:
https://www.uusiteknologia.fi/2022/06/15/eurooppalainen-softaradio-kehittyy-rohde-schwarz-mukaan/
Tomi Engdahl says:
An Epic Tale Of Pirate Radio In Its Golden Age
https://hackaday.com/2022/06/28/an-epic-tale-of-pirate-radio-in-its-golden-age/
Retrotechtacular: Max Headroom Takes Chicago In Audacious TV Hack
https://hackaday.com/2016/11/23/retrotechtacular-max-headroom-takes-chicago-in-audacious-tv-hack/
Tomi Engdahl says:
https://hackaday.com/2022/07/02/aluminum-foil-20-cm-antenna-for-10-m-operation/
Tomi Engdahl says:
Simulation example: AM transmitter and receiver
https://wiki.gnuradio.org/index.php/Simulation_example:_AM_transmitter_and_receiver
The first section of this tutorial explains how an Amplitude Modulated (AM) signal can be created. Rather than using any real hardware for transmission, the signal is sent via a socket to the second section of the tutorial which explains how to demodulate the received signal. The only actual hardware involved is the computer’s microphone input and speaker output. In the case of a Raspberry Pi computer, which has no microphone input, an alternative is presented.
This tutorial can be performed with either GNU Radio (GR) version 3.7 or 3.8 (and later). The Graphical User Interface gnuradio-companion (GRC) is used to create a flowgraph for each section.
Tomi Engdahl says:
Building an AM Transmitter with HackRF One
https://www.dlineradio.co.uk/articles/building-an-am-transmitter-with-hackrf-one/
Tomi Engdahl says:
SDR++ Android Public Pre-release #703
https://github.com/AlexandreRouma/SDRPlusPlus/discussions/703?fbclid=IwAR0h-w_pEOTcAJS6YA0HW-lZ_3K06mpmveUaJXyLyxkYJBBh3ywLZjfT1Kc
Tomi Engdahl says:
https://hackaday.com/2022/06/29/shielding-a-cheap-rtl-sdr-stick/
Tomi Engdahl says:
Very Low-Cost RF Test Equipment for the DIY Engineer or Student (<$1,000)
Get one for your favorite engineer for the holidays!
https://www.microwavejournal.com/articles/35138-very-low-cost-rf-test-equipment-for-the-diy-engineer-or-student-1000?gclid=EAIaIQobChMI6Pjk_Ibk-AIV2Y1oCR21tgH1EAAYAiAAEgKSd_D_BwE
Tomi Engdahl says:
Advances in Software-Defined Radio
July 6, 2022
Victor Woolesen, Per Vices CEO, discusses the challenges and advantages of implementing software-defined radio.
https://www.mwrf.com/technologies/systems/video/21245989/electronic-design-advances-in-softwaredefined-radio?utm_source=RF+MWRF+Today&utm_medium=email&utm_campaign=CPS220707045&o_eid=7211D2691390C9R&rdx.ident%5Bpull%5D=omeda%7C7211D2691390C9R&oly_enc_id=7211D2691390C9R
Software-defined radio (SDR) moves encoding and decoding of radio signals into the software realm. It provides a flexibility that’s useful in a range of applications, including signal interception, spectrum policy enforcement, interference detection, signal intelligence (SIGINT), and monitoring restricted areas such as military installations and airports.
https://www.pervices.com/