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Archive for the ‘RF’ Category

40 meter XCVR size of an business card with 1 watt output, 7.000 to 7.150 MHz coverage

Friday, July 29th, 2016

A business card size homebrew 40 meter XCVR project from Ray Ring: I tweaked my previous XCVR design to use push button tuning and made the board layout extremely compact. I improved the side tone injection to be absolutely  perfect – not too loud, full break in and no clicks. I went...

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Progress on the LDMOS amplifier

Friday, July 29th, 2016

An update on Pete's (N6QW) LDMOS amplifier project we covered previously: The real value of the breadboard test system is that it enables you to find/discover things that were not so obvious. Currently I have the Start & Stop buttons wired to the Arduino. I also have all six of...

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Posted in DIY, RF | 1 Comment »

AD9834 and the IoT beacon

Tuesday, July 19th, 2016

m0xpd writes: I've been playing with a new RF generator for the IoT beacon... Actually, I do myself a disservice, because I've done rather more than just play with the RF generator. First, I've replaced the little USB to serial dongle which I used to program the original system and built...

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Georges F6DFZ’s very stylish homebrew version of the Scout Regen receiver

Tuesday, July 5th, 2016

Dave Richards AA7EE has published an article about Georges F6DFZ’s homebrew regen receiver: Several months ago, Georges F6DFZ sent me pictures of a Manhattan project he had just completed, using Rex’s MeSQUARES, and I have waited far too long to share it with you. It began life as a copy of the...

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Posted in DIY, RF | No Comments »

LDMOS amplifiers

Friday, June 24th, 2016

Pete (N6QW) writes: This project encompasses proving an Arduino Control of a hi Power Linear Amplifier. It is a new departure for N6QW as it has extensive I/O requirements which required moving to the Mega 2560 a Arduino variant that has 56 Digital I/O and 16 Analog Inputs. The on...

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Tracker for thing, APRS tracker with DRA818V

Friday, June 3rd, 2016

Tony G from Weird-Lab writes, "The idea of this project was to build a trackuino board with small gps module, low power arduino pro mini (3.3v @8mhz), a VHF transceiver DRA818V, and power management integrated." Project info at Weird-Lab site.

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Crystal motional parameters

Thursday, May 19th, 2016

[embed]http://www.youtube.com/watch?v=y-rCgumTn4Q[/embed] Craig writes: Ever tried searching through your datasheets for the motional parameters of that quartz crystal you just bought? Good luck! Vendors simply don’t specify these parameters to general end users, and for most applications that’s OK. But for high Q oscillator and filter design, measuring and matching crystals...

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Posted in how-to, RF | No Comments »

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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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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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 »

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  • Stennly: Despite the popularity of STM32s, it may not be the best place to start. As mentioned already, the Silicon Labs gecko family is cheap to...
  • Pete Juliano: Since this posting on my blog I have received an excellent suggestion on how to quickly disconnect the 48 VDC from the amp so you...
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