Author Archive

https://developers.redhat.com/blog/2017/08/31/on-link-modeling-network-emulation-and-its-impacts-on-applications/?sc_cid=7016000000127ECAAY In every packet-switched network, you will notice characteristics that are intrinsic to them and that varies depends on the communication channels being used. Such characteristics are bandwidth, delay (including jitter), packet loss, packet corruption and reordering. Linux has the tc queue discipline ‘netem’ for quite some time now. Netem is capable of emulating all →

Bitcoin is a worldwide cryptocurrency and digital payment system called the first decentralized digital currency. It was released as open-source software in 2009.The system is peer-to-peer, and transactions take place between users directly, without an intermediary.These transactions are verified by network nodes and recorded in a public distributed ledger called a blockchain. On 1 August →

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 →

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) 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 →

This is good stuff! Building your own SDR-based Passive Radar on a Shoestring http://hackaday.com/2015/06/05/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 →

http://www.edn.com/electronics-blogs/edn-moments/4420729/1st-actual-computer-bug-found–September-9–1947?utm_content=buffer327f4&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer 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.  →

https://create.arduino.cc/projecthub/contests/arduino-mkrfox1200 This competition is challenging you to create innovative projects that take advantage of Sigfox’s global LPWA network, going beyond just remote weather stations and tweeting plants. →

http://www.zdnet.com/article/sun-set-oracle-closes-down-last-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 →

https://techcrunch.com/2017/09/08/its-time-to-build-our-own-equifax-with-blackjack-and-crypto/?utm_source=tcfbpage&sr_share=facebook 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: →