RF

The NSA’s Software Defined Radio application “RedHawk” is now open source

https://swling.com/blog/2019/01/the-nsas-software-defined-radio-application-redhawk-is-now-open-source/ page says that NSA released a bunch of software to open source at https://code.nsa.gov/ There is an interesting looking project called “RedHawk” which is described as: “A software-defined radio (SDR) framework designed to support the development, deployment, and management of real-time software radio applications.” github link: https://github.com/redhawksdr Here’s the documentation: https://redhawksdr.github.io/Documentation/index.html

Comparison of Wireless Technologies (Bluetooth, WiFi, BLE, Zigbee, Z-Wave, 6LoWPAN, NFC, WiFi…

https://predictabledesigns.com/wireless_technologies_bluetooth_wifi_zigbee_gsm_lte_lora_nb-iot_lte-m/ Deciding what type of wireless technology your new product should use can be an overwhelming task. This article has organized the various wireless technologies into a groups based on functionality, data speed, and operating range. This is a long, very detailed article.

LED lighting can disrupt radio communications | Southgate Amateur Radio News

http://www.southgatearc.org/news/2018/october/led-lighting-can-disrupt-radio-communications.htm#.W9XAslNyg0M Dutch amateur radio society VERON reports the current EMC standard, developed in the last century, no longer suffices. “The faulty LED lights disrupt wireless connections in and around the house. Radiocommunications Agency therefore starts an investigation into 50 LED lamp suppliers.” “A number of lamps do not appear to meet the EMC standard. Especially

With the “Dead Bug” Method, Hobbyists Can Break Through the High-Frequency Barrier – IEEE Spectrum

https://spectrum.ieee.org/geek-life/hands-on/with-the-dead-bug-method-hobbyists-can-break-through-the-highfrequency-barrier PCBs are essential in mass-produced products. They assure almost perfectly repeatable circuits. And PCBs with a good ground plane are essential for high-frequency circuits. But rapid prototyping with PCBs has drawbacks compared with the speed and ease of building a circuit on a breadboard. This article presents one practical alternative to PCB for high-frequency

Make simple fixtures from SMA connectors | EDN

https://www.edn.com/electronics-blogs/si-pi-masterclass/4461028/Make-simple-fixtures-from-SMA-connectors For testing SMD components you need some test fixture. A fixed-geometry fixture produces consistent and repeatable results. This article tells how you can easily make fixed-geometry fixtures out of PCB-mounted SMA connectors. You can build a fixture to measure bypass capacitors using SMA-female edge-mount connectors. The narrow-base connectors (5 mm grid) and are best

USB VGA adapter as RF transmitter

Hackaday article Spoofing Cell Networks with a USB to VGA Adapter tells that at OsmoDevCon [Steve Markgraf] released osmo-fl2k, a tool which allows transmit-only SDR through cheap USB 3.0 to VGA adapters based on the Fresco Logic FL2000 chip. Available through the usual overseas suppliers for as little has $5 USD. The claim is that these devices

Radar motion detector

I needed a motion detector for Arduino. I saw a cheap Microwave Radar Induction Switch Human Motion Sensor Module at DX (similar also available at Banggood at pack of 5). It advertises High Sensitivity for Arduino, Long Sensing Distance, Wide Sensing Angle for Detecting Moving Objects. Using this is a microwave sensor module that specifically

Start Emulating an Apple I on Your TV Wirelessly with a $3 ESP8266

https://blog.hackster.io/start-emulating-an-apple-i-on-your-tv-wirelessly-with-a-3-esp8266-80ba56a1e41f Apple’s first product, the Apple I, is now more than 40 years old. The processor was a MOS 6502 running at a mere 1MHz, and it only came with 4KB of memory.  Emulating the OS takes very little power. That last point is where the maker-favorite ESP8266 comes in. The ESP8266 can be purchased for as little