Archive for September 2017

My antenna measurements with RTL-SDR

In my Antenna measurements with RF noise source posting I described how antenna measurements can be done with RF noise source, directional coupler and SDR radio (DVB-T stick). To do measurement we connect the noise source to the output of the coupler, the antenna to the input of the coupler and the RTL-SDR dongle to

Trying TV signal splitter for antenna measurements

I did some antenna measurement with RTL-DSR with help of directional coupler. Before I realised I had directional coupler, I did some experimenting with antenna signal splitter. RF splitters are widely used in RF applications. The enable RF power to be split or combined within an environment where the characteristic impedance is maintained. There are

Software Defined Radio (SDR) category

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

SDR passive radar

This is good stuff! Building your own SDR-based Passive Radar on a Shoestring two $8 RTL software defined radio dongles and two log-periodic antennas. And get this, the radar system you’re going to build works by listening for existing transmissions that bounce off the targets being measured! A passive radar is a special type

1st actual computer bug found, September 9, 1947 | EDN–September-9–1947?utm_content=buffer327f4&utm_medium=social& The term “bug” had been used by engineers to describe flaws in machines as far back as Thomas Edison, but Hopper popularized “bug” and “debug” as early computer-programmer language. 

Sun set: Oracle closes down Sun product lines Officially, Oraclehasn’t said a thing.  As many as 2,500 Oracle, former Sun, employees have been laid off. Good bye, SPARC. Good bye, Solaris. Your day is done. None of this is a real surprise.  Indeed, you’d be hard pressed to find anything that went right with Oracle’s $7.2 billion purchase of Sun. Oracle buying Sun was a

It’s time to build our own Equifax with blackjack and crypto | TechCrunch This article talks about security breach that will affect verty many people in the USA. It can cause need to rethink the current sloppy security practices on many companies – the identifying data many companies use has now leaked out. The private data of 143 million Equifax “customers” is now available for download. Have no doubt:

5 Google ARCore Experiments That Inject Magic into Everyday Life – Road to VR Google just released a preview version of ARCore for Android as the company’s answer to Apple’s ARKit. Since ARKit was released a few months ago, we’ve seen a bevy of really cool experiments and potential apps to come from developers from all over the world, but now it’s ARCore’s turn to shine.