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Archive for the ‘RF’ Category

Simple crystal tester

Monday, May 2nd, 2016

Dilshan Jayakody writes: This is simple Colpitts oscillator to test commonly available passive crystals which range between 2MHz to 27MHz. This unit must connect to an oscilloscope and/or frequency counter to get the frequency of the crystal. This circuit is design to work around 9V to 12V DC power source....

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Posted in RF, testing | No Comments »

Building a better RTL-SDR TCXO

Tuesday, March 22nd, 2016

Craig posted an article describing how he built a 28.8MHz RTL-SDR TCXO, that is available on github: Here’s a scratch-built 28.8MHz TCXO capable of +-1ppm stability from 0C-55C; best of all, it’s not only easy to build, but is designed entirely from readily available and inexpensive components. For improved temperature...

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Posted in RF | No Comments »

14 GHz Ku Band Block UpConverter

Thursday, December 3rd, 2015

Sebastian (a.k.a KF5OBS) writes,  "A quick look at what it takes to make a Block UpConverter (BUC) for the 14 GHz Ku-Band satellite uplink band work. A BUC is used in professional Broadcast TV environments to convert a video signal from a L-Band intermediate frequency to the 14 GHz range...

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Posted in RF | No Comments »

The Sproutie “SPT” Beacon – A legal, unlicensed HiFER beacon

Thursday, November 19th, 2015

Dave Richards (a.k.a. AA7EE) has written an article detailing his "SPT" Sproutie HiFer beacon project: My first “proof of concept” at putting together a beacon for this band was to connect an N0XAS PicoKeyer in beacon mode to my Pixie 2 transmitter. With the PiicoKeyer, if you insert the prosign BN...

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Posted in DIY, RF | No Comments »

TI Design Contest: Envision the ultimate NFC wearable

Saturday, June 13th, 2015

TI has announced a contest for NFC based wearable designs. Do you dream of creating a solution to make monitoring health and fitness activities easier? Using near field communication (NFC) in your designs can help! We want to hear your ideas for the next wearable design based on our RF430FRL15xH...

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Posted in contest, RF, sensors, wireless | 3 Comments »

Sniffing Crazyflie’s radio with HackRF blue

Friday, June 12th, 2015

arnaud acquired a HackRF Blue and has been busy coding up a GNURadio project for analyzing Crazyflie radio transmissions. Crazyflie is a nano quadcopter/drone controlled over a wireless link. The Crazyradio is the official radio dongle for the Crazyflie Nano Quadcopter. It is a 2.4GHz USB radio dongle based on...

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Posted in code, reversed, RF, wireless | No Comments »

YOUSDR remote RTL-SDR software

Monday, April 6th, 2015

Sixuniform has released YOUSDR v0.1 Alpha, an RTL-SDR webinterface for Raspian / Raspberry Pi. This is a web-wrapper for the rtl-sdr softwares. Currently it commands rtl_fm, rtl_tcp and dump1090. The software can be downloaded from its GitHub. The instructions on the GitHub page show how to set it up on...

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Posted in open source, RF, SDR, software | No Comments »

Arduino compatible LightBlue Bean adds Node-RED support

Sunday, March 29th, 2015

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Posted in Arduino, R-Pi, RF, wireless | No Comments »

Tektronix RSA 306 – GPS receiver and clock reference

Wednesday, March 11th, 2015

KF5OBS writes, "The Tektronix RSA 306 is a great low-cost USB 3.0 spectrum analyzer for up to 6 GHz in an ultra low-profile format. If paired with the RSA Map function of SignalVu-PC and a GPS receiver, it becomes an extremely powerful tool for interference hunting and signal strength mapping. This...

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Posted in RF, Teardowns | No Comments »

OpenSprinkler Firmware 2.1.1 new feature: Control remote power sockets

Tuesday, December 16th, 2014

We previously covered Ray’s OpenSprinkler. Now it has added a new feature to remotely toggle radio frequency power sockets: This allows OpenSprinkler to not only switch sprinkler valves, but also easily control powerline devices such as lights, heaters, pumps, fans. Looking for a programmable way to control Christmas lights? Look...

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Posted in open source, RF | No Comments »

Reverse engineering a Verisure wireless alarm

Tuesday, December 9th, 2014

Here's an informative two-part series of posts over at FunOverIP detailing how to reverse engineer a Verisure wireless alarm. Part 1 details the beginning steps such as finding the modules radio frequency and modulation type, analyzing the chipset datasheet and using GNU Radio.

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Posted in reversed, RF, SDR, security, sensors, wireless | 2 Comments »

Viewing a VHS tape using RTL-SDR and TV Sharp software

Tuesday, November 18th, 2014

Here's a different and unconventional way to view a VHS tape (as if VHS tapes aren't considered unusual enough today). DogsRNiceMineCraft posted this video on YouTube showing video received using an RTL-SDR dongle. I got a VCR today and wanted to see if I could receive the signal from the...

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Posted in hacks, RF, SDR, software | 4 Comments »

Introducing RFToy, an Arduino-compatible gadget for radio frequency modules

Monday, November 10th, 2014

Ray Wang from RaysHobby has informed us of his latest open-source project called RFToy: it's an Arduino-compatible microcontroller board for interfacing with radio frequency (RF) modules, such as the popular 433/315MHz transmitter/receiver, and the nRF24L01 transceiver. The RFToy has a built-in ATmega328, USB-serial converter (CH340G), 128x64 OLED display, three buttons, and...

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Posted in Arduino, RF | 8 Comments »

Video: FlexRadio open API

Sunday, October 12th, 2014

During the TAPR/ARRL Digital Communications Conference in Austin last September, Stephen Hicks N5AC gave this presentation on interfacing with FlexRadio using their open API. Part II of this presentation was given by Graham Haddock KE9H, and discussed the FlexRadio wavefrom API. It is available from HamRadioNow. FlexRadio produces a series...

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Posted in code, RF, SDR, Videos | 1 Comment »

Project: extracting and geographically plotting DTRS site information

Sunday, September 28th, 2014

Lui Gough has been researching the Australian railroad system's new digital radio system and has posted detailed observations: As a radio enthusiast, and highly observant public transport user, I’ve made many notes about the deployment of the new Digital Train Radio System (DTRS) sites. This new system is based upon...

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Posted in digital radio data, RF | No Comments »

ESP8266 WiFi chip module

Wednesday, September 24th, 2014

Richard Sloan writes in to highlight his site featuring info on the ESP8266 WiFi module. There is a new IC on the market that is creating a lot of stir, ESP8266 very low cost WIFI chip, available are boards now from China for $5 or less, we are supporting these...

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Posted in components, RF, site, wireless | 1 Comment »

Mastervolt soladin RF filtering

Wednesday, September 17th, 2014

Brian Dorey writes: Following from the Mastervolt Soladin 600 Inverter RF Interference post about the major RF interference problems generated by the Mastervolt Soladin 600 tie-in mains inverter we have now resolved the RF interference by replacing the unscreened and unearthed plastic case on the inverter with an earthed metal...

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Posted in RF | No Comments »

Tutorial: GNU Radio with the HackRF SDR

Friday, August 22nd, 2014

Michael Ossmann, one of the developers of the amazing and affordable HackRF SDR transceiver, is releasing a tutorial series on using GNU Radio. "This ongoing video series will be a complete course in Software Defined Radio (SDR). In this course, you'll build flexible SDR applications using GNU Radio through exercises...

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Posted in open source, RF, SDR, tutorials | 3 Comments »

Reverse engineering a wireless soil moisture sensor

Thursday, July 24th, 2014

Ray Wang at Rayshobby has been working on reverse engineering a wireless soil moisture sensor. He writes, "At the Maker Faire this year I got lots of questions about soil moisture, which I knew little about. Recently I started learning about how to build my own soil sensor, and came...

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Posted in R-Pi, reversed, RF, sensors, wireless | No Comments »

Interfacing the STM32VLDISCOVERY with Semtech’s SX1272RF1BAS module

Tuesday, July 15th, 2014

Milen Pavlov with Netblocks wrote this post on connecting a STM32VLDISCOVERY with Semtech's SX1272RF1BAS module (LoRa sx1272 transceiver.) This module incorporates the LoRa spread spectrum modem which is advertised as achieving significantly longer range than existing systems based on FSK or OOK modulation. It operates using low power in the...

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Posted in code, dev boards, how-to, RF | No Comments »

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  • Paul Campbell: I'm old enough that I started programming with punched cards .... each card had a sequence number in the last few characters. A friend once...
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  • J. Peterson: Nice writeup. It looks like some of the formatting for your command examples needs some missing newlines?
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