Wednesday, September 7th, 2016
Scott has published a new build: This is the general idea behind how this frequency counter works. It’s so simple! It’s entirely digital, and needs very few passive components. sn74lv8154 is configured in 32-bit mode (by chaining together its two 16-bit counters, see the datasheet for details) and acts as...Tags: Microcontrollers, python, radio frequency
Posted in RF | No Comments »
Tuesday, August 23rd, 2016
Scott from SWHarden has published a new build: Line driver chips are one of my go-tos for quickly amplifying digital signals because they’re so fast to drop in a breadboard and they provide a strong output with very high impedance inputs and need no external components. Individual buffer of the...Tags: radio frequency
Posted in DIY, RF | No Comments »
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...Tags: DIY, XCVR
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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...Tags: LDMOS amplifier
Posted in DIY, RF | 1 Comment »
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...Tags: AD9834, IoT, RF generator
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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...Tags: homebrew, regen receiver
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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...Tags: amplifier, Arduino
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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.Tags: APRS, DRA818V, tracker
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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...Tags: motional parameters, quartz crystals, Saunders 150B
Posted in how-to, RF | No Comments »
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....Tags: colpitts, crystal, frequency, oscillator, RF, tester
Posted in RF, testing | No Comments »
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...Tags: oscillator, RTL-SDR, TCXO
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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...Tags: microwave, radio frequency
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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...Tags: HiFER Beacon, homebrew radio, QRP, QRSS
Posted in DIY, RF | No Comments »
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...Tags: NFC, RF430FRL15xH, Ti, wearables
Posted in contest, RF, sensors, wireless | 3 Comments »
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...Tags: Crazyflie, Crazyradio, GNU radio, HackRF Blue
Posted in code, reversed, RF, wireless | No Comments »
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...Tags: remote control, RTL-SDR, YOUSDR
Posted in open source, RF, SDR, software | No Comments »
Sunday, March 29th, 2015
Tags: BLE, bluetooth, IoT, LightBlue Bean
Posted in Arduino, R-Pi, RF, wireless | No Comments »
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...Tags: Radio Frequency (RF), Tektronix RSA 306
Posted in RF, Teardowns | No Comments »
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...Tags: automation, remote power socket, RF transmitter
Posted in open source, RF | No Comments »
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.Tags: GNU radio, reverse engineering, Verisure alarm module
Posted in reversed, RF, SDR, security, sensors, wireless | 2 Comments »
