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

  • Network reconnaissance and vulnerability assessment
    In this experiment, we will practice network reconnaissance: gathering information about a network, such as the network structure, applications and services, and vulnerabilities. This experiment involves running a potentially disruptive application over a private network within your slice on GENI. Take special care not to use this application in ways
  • SSL Stripping Attack
    In this experiment, we will set up an SSL stripping attack on GENI and will demonstrate what the attack does to the encrypted communication between a client and a site. We will examine what information an “attacker” can see by using the attack and under what conditions the attack works.
  • Passive sniffing in 802.11 networks
    In this experiment, we will observe the level of confidentiality provided by three kinds of WiFi networks - an open WiFi network, a WEP network, and a WPA network. You will have to download and install Wireshark to run this experiment. You should do this before your reservation on the

RSS Crazy Danish Hacker

RSS Blog – Hackaday

  • JigFab Makes Woodworking Easier
    Woodworking is an age-old craft that requires creativity and skill to get the best results. Experienced hands get the best results, while the new builder may struggle to confidently produce even basic pieces. JigFab is here to level the playing field somewhat. Much of the skill in woodworking comes with …read more
  • Power Stacker, A Modular Battery Bank
    Many of us will own a lithium-ion power pack or two, usually a brick containing a few 18650 cylindrical cells and a 5 V converter for USB charging a cellphone. They’re an extremely useful item to have in your carry-around, for a bit of extra battery life when your day’s …read more
  • Hack my House: UL Certification and Turning the lights on with an ESP8266
    It’s hard to imagine a smart house without smart lighting. Maybe it’s laziness, but the ability to turn a light on or off without walking over to the switch is a must-have, particularly once the lap is occupied by a sleeping infant. It’s tempting to just stuff a relay in …read more

RSS ZeroSec – Adventures In Information Security

  • Leveraging Expression Language Injection (EL Injection) for RCE
    Expression Language injection or EL Injection for short is an attack vector I'd never heard of until recently. This post talks about leveraging EL for RCE.
  • NMAP Tips: RTFM?
    NMAP TL;DR It's a tool used for portscanning and this post will explore some of the common and useful flags that can be used while scanning to pick up usful information about targets. What Is NMAP? Nmap or Network mapper is an open source tool for network discovery and
  • 2019 Coming Up and ZSEC Blog 2018 in Review
    2018 saw a lot of ups and downs for me both personally and professionally but I have learned a lot and put out a lot of blog posts(12 in fact!).

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( );

  • Sending Samples to Python from GRC using ZMQ Sink
    When we need to process some data generated by an SDR device, the most convenient approach we have currently is saving the data into a file and then reading the files from Python. However, if the requirement is to process data in real-time as they are generated from the SDR device, saving to a file […]
  • Starting Viber with too large resolution
    After installing a brand new Ubuntu 18.04 LTS on my computer, I made some adjustments to the font sizes of the operating system in order to make it better suit for my perception. However, I realized that something is wrong after installing Viber on my desktop. The GUI of the Viber application appears so huge […]
  • Truly Reproducible Research Papers
    A slide from Prof. Barry Smyth's presentationIf you perform an experiment and get some interesting results which cannot be redone and get the same results by somebody else, something is wrong with your finding. This is called reproducibility of research. If it is not reproducible, it is not science. You might think that systematic research […]

RSS AMSAT-UK

  • Simple dual band dish feed for Es’hail-2 / QO-100
    The April 2019 issue of the free DKARS magazine features an article in English – Simple dual band dish feed for Es’hail-2 / QO-100 by Mike Willis G0MJW, Remco den Besten PA3FYM and Paul Marsh M0EYT. Their article, on pages … Continue reading →
  • SatNOGS satellite ground station article in HackSpace magazine
    The May edition of HackSpace magazine, issue 18, featuring articles by radio amateur Jo Hinchliffe MW6CYK is available as a free PDF. On pages 34-47 is his special feature on Space, which explains how you can build a SatNOGS satellite … Continue reading →
  • FUNcube Data Warehouse URL Change
    Dave G4DPZ reports on a change to the URL used by the AMSAT-UK Data Warehouse for the FUNcube amateur radio satellites. As part of the migration of the data warehouse to the new server, we are now redirecting all dashboard … Continue reading →

RSS Gough's Tech Zone

  • Fake: Hoya PRO1 Digital UV Filter
    Recently, having purchased a new lens (even though it was only a kit lens), I thought it would be a good idea to protect the front element with a clear UV filter. While this practice is sometimes debatable as filter … Continue reading →
  • Beta Tested: Cooee Busways On Demand Public Transport Service
    Residents in the Hills district have much to celebrate, as after many years of promises, the North-West Metro medium-capacity rail system is close to being finally commissioned for service. Areas previously neglected by public transport will now have a high-frequency … Continue reading →
  • long Rnd(): Birthday Analysis, Spoiling Myself, Fixing Stuff, Thrifty Finds, Parking Tickets & More
    It’s been a busy long-weekend, but there’s no better post than a “long random” for a long weekend! This time around, it just so happens to be my birthday as well. Happy Birthday to Me? Really? Well, what can I … Continue reading →

RSS Compass Security Blog

  • Windows Forensics with Plaso
    Present State of Affairs We have been teaching forensics and network incident analysis for quite a while. We have investigated into a reputable number of cases and we are not the only doing so. Hence, one would expect a certain degree of automation in analysis. However, the high frequency of software release cycles somehow leads […]
  • XSS worm – A creative use of web application vulnerability
    In my free time, I like to do some bug bounty hunting. For some reasons, I’ve been doing this almost exclusively for Swisscom. One of the reason is that the scope is very broad and I like to have this vast landscape full of possibilities. While preparing the talk we had at BlackAlps (https://www.blackalps.ch) with […]
  • Substitutable Message Service
    Have you ever said something and later regretted it? Or written an email to someone and then wished it had not happened? Or sent an SMS message but afterward desired to change its content? Well, replacing the content of previously sent SMSs is actually possible. SMS messages can be constructed in one of two modes: […]

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 DB6SW (KF5OBS)

  • Arduino |Automatically Save Variables to EEPROM on Power-Down
    A recurring challenge for Arduino projects is that variables are volatile and will be lost completely unless previously stored to some sort of non-volatile storage such as de inbuilt EEPROM. This article shows a minimalistic approach to detect sudden loss of power and automatically store a variable to an EEPROM adress. First I should mention […]
  • Diamex Prog-S2 | Arduino IDE
    The Diamex Prog-S2 is an universal USB ISP programmer vor various microcontrollers including Atmel AVRs. This article shows how to integrate the programmer into the Arduino IDE There are a few articles on the web that talk about the Diamex Prog-S2 and Arduino. But it seemed to me like they were either outdated or faulty. […]
  • Automated Forward Gain Measurement
    This article is going to take you into the world of automation. Using MATLAB and commercial off-the-shelf bits and pieces, this article will show how to measure the forward gain of a RF device. For a long time now I had a bunch of Mini Circuits portable test equipment bits and pieces sitting around. S […]

RSS owenduffy.net

  • Measuring balun common mode impedance – #3
    A correspondent having read my series Measuring balun common mode impedance – #1 related difficulties with his Rigexpert AA-230Zoom. The articles showed some techniques for measuring common mode impedance of a current balun. The following examples are of a test choke wound on a BN43-202 binocular core, and the results are quite similar to what […]
  • Small common mode choke for analyser antenna measurements using 2843000202 (BN43-202)
    The project is design, implementation and test of a small common mode choke for use with an analyser for antenna measurements. The choke must have medium to high Zcm from 1 to 30MHz. It is intended to be used with analysers supporting SOL calibration, so effectively any impedance transformation within the fixture is compensated and […]
  • Effective noise bandwidth – IC-7300 CW Rx Filter2 – (500Hz sharp)
    For a lot of experiments, knowledge of the Effective Noise Bandwidth (ENB) of a receiver is necessary. The ENB is the bandwidth of an ideal rectangular filter with the same gain as some reference frequency. Though filters are often specified in terms of bandwidth at x dB down, that metric is of relatively little value, […]