Liên kết hữu ích

  • MARTIN - G8JNJ - ECLECTIC AETHER - Adventures with Amateur Radio
  • Owen Duffy VK2OMD (ex VK1OD) - Good practical information relating to Electronics, Antennas, Feedlines, Baluns & just about everything else
  • Steve G3TXQ - Home of the Broadband Hexbeam and 1:1 Balun common mode impedance charts
  • Tom W8JI - Lots of practical antenna information and theoretical analysis
  • Dan N3OX - Lots of antenna practical construction information (especially verticals) and theoretical analysis
  • Adam AB4OJ/VA7OJ - Excellent information relating to Icom Radios and associated items
  • Alan K0BG - Everything you will ever need to know about mobile operation and compact antennas
  • Phil AD5X - Lots of very interesting articles and construction projects
  • Ian GM3SEK - Lots of practical design info. Especially these pages on cost effective common mode choke design
  • Jim KY9C - Loads of design and measurement information relating to common mode chokes
  • Chuck W1HIS - More notes on ferrite common mode chokes. Showing what you need to do to reduce EMI problems
  • L.B Cebik W4ML (SK) - The best resource for antenna design and modelling (free but you need to create a login account)
  • https://re-ws.pl

RSS Radio for Everyone

  • FM Audio Transmitters - Portables and Car Hands-Free
    FM Audio Transmitters - Portables and Car Hands-FreeI'm using FM transmitters for years, both portables and vehicle versions, and pretty much used the majority of types on the market, so here's how they work and which ones I recommend.How FM transmitters work?Output audio from a device via FM transmission standard: you set a frequency on […]
  • Review: Nooelec Rattlesnake 3-antenna kit
    Three antennas with magnetic mount and coax for $16:Review and observations are based on over half a year's use, summary: order from manufacturer, Amazon USA, or eBay right away. Rattlesnake kit is the best value aftermarket antenna package I ever came across. Period.Direct competitor on price ($15 on Amazon) is rtl-sdr.com's antenna kit, separate review here.First impressionsHeavy, feels good when opening the envelope:M5: Screw standard referring to […]
  • Portable Bluetooth Audio Signal Receivers
    Receive an audio signal up to 50 feet / 15 meters - best replacement for wires, also work as hands-free in a vehicle. Hands-on guide and five units tested and compared: cheap from China, for Hi-Fi, and midrange and expensive hands-free. Regardless of locale and prices, these four types cover most flavors on the market.What […]
  • Maximum USB cable length
    Question often comes up, Answer: 27 feet / 9 meters with RTL-SDR dongles:For testing, I tried four separate RTL-SDR dongles in image above: rtl-sdr.com v3, Nooelec Mini 2, Nooelec E4000 SMArtee and regular Nooelec SMArt.USB connector cable is crucial, as mentioned in a previous post detailing stuff I'm happy with, blue 5 feet / 1.5 m […]
  • RTL-SDR Dongles Image Gallery
    Studio Photos of over 20 RTL-SDR dongles on the market:More than 200 high-resolutions PCB, case and comparison images by clicking here.

RSS Run my experiment on GENI

  • Experimental evaluation of the impact of Tor latency on web browsing
    Tor is an anonymity network that is used by privacy-conscious users around the world to browse the web anonymously. However, routing web traffic through the Tor network also adds extra latency to each packet. In this experiment, we will set up a private Tor network, with complete control over network
  • Tackling the latency divide with Copa
    As voice- and video-based services that require low latency become increasingly essential, a tremendous research effort has been devoted to improving the latency performance of networks. However, there remains a "latency divide" between those whose Internet access is subject to high latency and those with low-latency access. Furthermore, it is
  • An Experimental Evaluation of Low Latency Congestion Control over mmWave links
    In this experiment, we will show how to replicate some key results relating to low latency congestion control over mmWave links. To reproduce this experiment on GENI, you will need an account on the GENI Portal, and you will need to have joined a project. You should have already uploaded

RSS Crazy Danish Hacker

RSS Blog – Hackaday

  • Hackability Matters
    The Unix Way™ provides extreme hackability. The idea is that software should be written as tools to accomplish discrete tasks, and that it should be modular, extensible, and play well with others. It’s like software as a LEGO set — …read more
  • TV Turned Automatic Etch a Sketch with Raspberry Pi
    Considering one of the biggest draws of the original Etch a Sketch was how simple it was, it’s always interesting to see the incredible lengths folks will go to recreate that low-tech experience with modern hardware. A perfect example is …read more
  • Doing WiFi With Software Defined Radio
    Software defined radio lets RF hardware take on a broad spectrum of tasks, all based on how that hardware is utilized in code. The bladeRF 2.0 micro xA9 is one such device, packing a fat FPGA with plenty of room …read more

RSS ZeroSec – Adventures In Information Security

RSS Genesys Guru Blog

  • Genesys Integration on The Wire (IOTW)
    Following on from a previous post on Genesys Management 2.0 here I’ve been doing some additional work on integrating Genesys environments with Elasticsearch. The result is what I call Genesys Integration on The Wire (IOTW).     Integration on The Wire (IOTW) is a technology which enables system level integration based on a “zero touch” […]
  • Genesys Management 2.0
    Hi – I’m back! Unfortunately, due to client confidentiality I’ve not been able to blog about Genesys work projects for a few years. Let’s change that .. This post is about something I have been looking at for several years in the form of a shelved project which gets events from Genesys components via the […]
  • 2016 Xmas Light show using Raspberry Pi Controller
    Enjoy!  

RSS fetch( ); decode( ); execute( );

  • Encrypting Files Using GnuPG
    This post shows how to use GnuPG to encrypt and decrypt files on a Linux environment.1. If you haven't created your GnuPG key pair yet, you can use the following commands to create them and view their details.Create a pair of GnuPG keys using the following command.gpg --gen-keyThe keys and their relevant information are stored […]
  • Sending Secure Emails with OpenPGP
    Use of encryption in our electronic communication is essential to protect our security and privacy. Here's how we can use OpenPGP standard to send and receive emails securly. While there are many software tools to get this done, I prefer this way.1. Create a pair of GNU Pritty Good Privacy (PGP) keys using the following […]
  • Setting up Hibernation on Ubuntu 18.04 LTS
    The ability to hibernate the computer when we are done for the day and get back to where we left next time was a useful feature we had in Ubuntu sometime back by default. However, unfortunately, recent Ubuntu versions does not offer this feature off-the-shelf. Recently, I wanted to get this feature into my laptop […]

RSS AMSAT-UK

  • CHESS CubeSat Constellation to carry FUNcube transponders
    In 2020, a project between AMSAT-UK, AMSAT-NL and Swiss universities started with the aim of equipping two Swiss satellites with a linear transponder for amateur radio. With a linear transponder, several QSOs can take place simultaneously. The satellites can be … Continue reading →
  • Video of Dual-band Eggbeater Antenna talk
    The South Dublin Radio Club have shared the talk Joe EI6EG gave them on the construction of a 2m – 70cm Dual Band “Eggbeater” Antenna. Also read this article – Build Your Own Satellite Antenna – by John Hemming G0UYT … Continue reading →
  • Winter issue of OSCAR News now available
    E-members of AMSAT-UK can now download the December 2020 edition of OSCAR News, issue 232, here. The paper edition edition will be sent to postal members and should arrive in the next 2-3 weeks. In this issue: • From the … Continue reading →

RSS Gough's Tech Zone

RSS Compass Security Blog

  • .CH Zone Lookup Tool
    Fighting cybercrime is one of the reason Switch announced to publish the .ch zone. Switzerland has a law on Open-Government-Data-Strategy that follows the open-by-default strategy The .ch zone file contains all registered .ch domain names that have a NS record that points to the nameserver that gives authoritative answers for that domain name. Compass Security is offering […]
  • The “Volatility Triage App” for Splunk
    Intro into a Compass Splunk App, which can be used to perform a first triage and high level analysis of Volatility results coming from multiple hosts.
  • Evading Static Machine Learning Malware Detection Models – Part 2: The Gray-Box Approach
    This part will discuss a grey-box approach in defeating malware detection. It will discuss the relevant features used and how they are fed into a malware detection model to classify an input file. After a short theory part, we try to find out which features are especially important for malware analysis and how to modify […]

RSS 0xicf

  • ClearEnergy ransomware can destroy process automation logics in critical infrastructure, SCADA and industrial control systems.
    Schneider Electric, Allen-Bradley, General Electric (GE) and more vendors are vulnerable to ClearEnergy ransomware. Researchers at CRITIFENCE® Critical Infrastructure and SCADA/ICS Cyber Threats Research Group have demonstrated this week a new proof of concept ransomware attack aiming to erase (clear) the ladder logic diagram in Programmable Logic Controllers (PLCs). The ransomware a.k.a ClearEnergy affects a massive […]
  • Flaws in Samsung’s ‘Smart’ Home Let Hackers Unlock Doors and Set Off Fire Alarms
      A smoke detector that sends you a text alert when your house is on fire seems like a good idea. An internet-connected door lock with a PIN that can be programmed from your smartphone sounds convenient, too. But when a piece of malware can trigger that fire alarm at four in the morning or […]
  • Waze | Another way to track your moves
    Millions of drivers use Waze, a Google-owned navigation app, to find the best, fastest route from point A to point B. And according to a new study, all of those people run the risk of having their movements tracked by hackers. Researchers at the University of California-Santa Barbara recently discovered a Waze vulnerability that allowed […]

RSS Nick Whyte

  • 100 Warm Tunas 2018 Prediction Analysis
    Over the space of 6 weeks, 100 Warm Tunas collected a large sum of data and chugged away at it to make some predictions about what the Hottest 100 of 2018 would look like. In summary, We collected 6,234 entries (13.6% decrease since 2017 🔻). We tallied 58,463 votes across these entries (12.9% decrease since […]
  • 100 Warm Tunas has a new home!
    100 Warm Tunas has found a new home this year! This year’s results, along with the past 2 years can now be found at 100warmtunas.com. The existing domain (100-warm-tunas.nickwhyte.com) will simply perform a 301 permanent redirect to the new domain, so all existing inbound links should be unaffected.
  • 100 Warm Tunas 2017 Prediction Analysis
    🔥💯 🔥💯 Over the space of 6 weeks, 100 Warm Tunas collected a large sum of data and chugged away at it to make some predictions about what the Hottest 100 of 2017 would look like. Along the way we encountered a bug in the collection process, however data was backfilled and showed that I […]

RSS owenduffy.net

  • Amidon’s method of rating ferrite inductors and transformers
    I have set out an initial design method for RF inductors and transformers using toroidal ferrite cores and over time I get correspondence drawing my attention to Amidon’s advice, specifically sections 1-36 and 1-38. Section 1-36 states explicitly that it is applicable to Iron Powder and Ferrite, which is interesting because they are very different […]
  • Quantifying performance of a simple broadcast receive system on MF
    I see online discussions struggling to try to work out if a receiving system is sufficiently good for a certain application. Let’s work an example using Simsmith to do some of the calculations. Scenario: 20m ground mounted vertical base fed against a 2.4m driven earth electrode @ 0.5MHz; 10m RG58A/U coax; and Receiver with 500+j0Ω […]
  • nanoVNA – measure Transmission Loss – example 4
    This article is demonstration of measurement of Transmission Loss in a section of coaxial transmission line. The scenario is chosen to expose the experiment to some of the things that complicate such measurements. The very popular nanoVNA-H will be used to make the measurements. The scenario: nanoVNA fully calibrated from 1.5-1.8MHz using a 200mm length […]