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)


  • Spektrum SV Mod: RTL-SDR Spectrum Analyzer Software Now with Improved UI
    Spektrum is a popular spectrum analyzer program that is used with RTL-SDR dongles. It is based on the command line rtl_power software and is compatible with both Windows and Linux. Thanks to it's easy to use GUI it is an excellent piece of software for scanning and determining where active signals exist, or for measuring […]
  • GammaRF: Distributed Radio Signal Collection and Analysis with RTL-SDR and HackRF
    Thank you to Josh for submitting news about his project called GammaRF. GammaRF is an client-server program that is used to aggregate signal information via the internet from distributed SDRs. Currently the RTL-SDR and HackRF SDRs are supported. ΓRF (“GammaRF”, or “GRF”) is a radio signal collection, storage, and analysis system based on inexpensive distributed […]
  • Listening to the Sound of Molecules via Nuclear Magnetic Resonance and an RTL-SDR
    Over on YouTube user aonomus has uploaded a video showing how he's used an RTL-SDR to observe and listen to the radio signal generated via a chemistry lab's nuclear magnetic resonance machine. To do this he simply taps the RF output of the NMR machine which allows the RTL-SDR to listen to the signal and play it as […]

RSS Radio for Everyone

  • 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: 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.
  • Nooelec Ham It Up Plus upconverter / noise source
    An upconverter lets you hear signals below the tuning range of RTL-SDR dongles, so signals less than 30MHz, that's the entire shortwave / medium wave / longwave spectrum will be audible with a suitable antenna. Works by adding 125 MHz to received signal, so a station on 3MHz will show up at 128 MHz, which falls […]
  • About Software Defined Radio and RTL-SDR
    What?Software Defined Radio: computer or smartphone does signal processing, not individual and expensive components as with traditional radios. The cheapest way into radio reception, best bang for the buck.RTL refers to chipset converting analog radio signal to digital form.RTL-SDR dongles are digital TV tuners re-purposed for radio signal reception; with a special driver and free software, […]
  • Review and Comparison: Nooelec SMArt XTR and SMArtee XTR
    Start with a legendary chipset, combine it with an advanced RTL-SDR platform, send three antennas and top it up with 2-year warranty: end up with a Nooelec SMArt XTR featuring the E4000. Yes, that E4000.Continue reading ...

RSS Run my experiment on GENI

  • 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
  • The spanning tree protocol
    In this experiment, we will see how broadcast storms can occur in a network with bridge loops (multiple Layer 2 paths between endpoints). Then, we will see how the spanning tree protocol creates a loop-free logical topology in a network with physical loops, so that a broadcast storm cannot occur.

RSS Crazy Danish Hacker

RSS Blog – Hackaday

  • Nim Writes C Code — And More — For You
    When we first heard Nim, we thought about the game. In this case, though, nim is a programming language. Sure, we need another programming language, right? But Nim is a bit different. It is not only cross-platform, but instead of targeting assembly language or machine code, it targets other languages. So a Nim program can […]
  • DIY Studio Lights To Improve Your Videos
    It’s 2018, a full thirteen years since YouTube was founded. With an online sharing service up and running, and high-resolution cameras in just about every mobile phone, the production of video has been democratized. Sadly, for those citizens with eyes, the production of good video is not so widespread. What’s one thing you need for good […]
  • Minimal Blinky Project Makes The Chip The Circuit Board
    We’ve got a thing for projects that have no real practical value but instead seek to answer a simple yet fundamental question: I wonder if I can do that? This dead-bug style 555 blinky light is one of those projects, undertaken just to see how small a circuit can be. Pretty small, as it turns out, […]

RSS ZeroSec – Adventures In Information Security

  • ZTH-CH2: - Security For Everyone
    I will explain the importance of using strong passwords, what multi-factor/two-factor authentication is and why it is important and also explain some more security tips.
  • LTR101 - Facing Your Fears
    Following a wee dry spell of blog posts here's my latest(a wee quickie). At the time of writing this blog I've since done three security conference talks in my life so far! For the duration of the year 2018, I set myself a few goals to overcome some of
  • ZTH-CH1: From Zero to Technical Hero
    This post will take the very core basics and explain them in a series of analogies that are easier to understand if you're completely non-technical or have minimal know-how. I want to make information security and the technicalities more accessible to the masses.

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

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

  • 3.5 inch LCD Display on Raspberry Pi
    I received a 3.5 inch LCD display which can be attached to the Raspberry Pi B+ device. It can be attached to the GPIO port of the RPi and use it as a display and as a touch screen for input. Installing drivers for the device was straightforward. Following are the steps I took to […]
  • A Signature Image for Documents
    While filling forms and preparing documents on the computer, I come across needs to put my handwritten signature on the document. In such cases, the printing of the document, signing it by hand and then scanning it to produce the soft copy is too much. It is useful to have an image of the signature […]
  • Low Graphics Mode Problem on Ubuntu 16.04 LTS
    My laptop, which runs Ubuntu 16.04 LTS, recently started to give me a strange error. When the computer is turned on, it boots into a screen where a message is shown as "Your system is running on low graphics mode". If I proceed to boot the system, the system boots up however the on-board WiFi […]


  • ExseedSat amateur radio FM transponder satellite
    The Hindu newspaper interviews radio amateur Gurudatta Panda VU3GDP about the ExseedSat CubeSat built by an eight-person team at the Hyderabad-based Exseed Space Private Limited that was co-founded by Ashhar Farhan VU2ESE. ExseedSat carries an amateur radio FM transponder and … Continue reading →
  • AM1SAT Special Award
    AMSAT EA will be on air on all available satellites with callsign AM1SAT from Sept 10-17 to celebrate IberRadio 2018 – IV Radiocommunications Fair, the biggest HAM party event in Spain and Portugal, Sept 15-16 Main grid will be IN70 … Continue reading →
  • ESEO satellite FUNcube-4 transponder talk at RSGB Convention
    Dr Chris Bridges M0IEB will be giving a presentation on FUNcube-4, an amateur radio transponder payload on the ESEO satellite mission, to the combined AMSAT-UK Colloquium / RSGB Convention in Milton Keynes at 1:30 pm on Sunday, October 14. Thanks to … Continue reading →

RSS Gough's Tech Zone

  • Visited: ElectroneX Expo (5-6th September 2018)
    Every two years, the ElectroneX Expo comes to Sydney. This expo is like a trade show for those involved in electronics design and assembly with a number of stalls from relevant vendors, free talks and is held in conjunction with … Continue reading →
  • Tech Flashback: Landline Sounds & Telephone Teardowns
    I’ve always been interesting in telephones and networks, but I’ve never really thought of becoming a telephone collector. Rather unexpectedly, through a process of not-throwing-things-out (it’s not hoarding, I swear!), I now have a few phones but not much to … Continue reading →
  • Note: Installing Firefox on a Fresh Windows Install without using IE
    It’s no big secret that Microsoft’s Internet Explorer and it’s closely related cousin, Edge, are not the world’s favourite browsers. They’re not even my favourite and for a number of good reasons. In the battle for market share, Microsoft has … Continue reading →

RSS Compass Security Blog

  • Hidden Inbox Rules in Microsoft Exchange
    Contents Introduction Attack Overview Step-by-Step Detection Email Clients Administration Tools Exchange Compliance Features MAPI Editor Eradication Microsoft Security Response Center Swiss Cyber Storm 2018 Conclusion References Introduction In recent investigations, Compass recognized a raise in popularity for attackers to compromise Microsoft Exchange credentials. As one of the first steps after having obtained the credentials (most […]
  • Area41 2018 Wrap Up
    Introduction Last Friday and Saturday (15./16. June 2018), the 6th edition of the security conference Area41 (formerly Hashdays, organized by DEFCON Switzerland (, took place in Zürich. Every Compass security analyst can attend two conferences every year supported by Compass. So most of the analysts decided to go to the Area41 this year […]
  • Compass at Area41 2018
    We are at the Area 41 conference! This IT Security Conference is happening on the 15/16th of June in 2018 in Zürich. Compass Security supports this non-profit event as Platinum Sponsor. We’ll have a Compass Booth where we discuss current topics with you – and how you can join our team as ethical hacker! The […]

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 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 […]
  • 100 Warm Tunas 2017 Update 🔥💯
    100 Warm Tunas has been happily chugging away for the last month or so. I’ve obtained a fair amount of media coverage too. A couple of days back, I posted the site to the triplej subreddit. Someone replied to the post telling me my vote count was significantly less than what they had been counting […]
  • 100 Warm Tunas 2016 Prediction Analysis
    It’s been a long time since the Hottest 100 of 2016 was aired. Unfortunately, I never really got around to publishing some analysis I performed on the prediction results. Fortunately, I managed to find some time recently! Looking from afar, the results don’t look fantastic (when you compare them to my results from 2015 at […]


  • 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 […]
  • Thermal Design Basics | Practical Example
    Thermal design is one of those things engineers don’t really learn in school and hobbyists often don’t even think about. This article is going to show some basic math with a practical example. One of my portable police scanners has an external 6V jack. To use it in my car I used my standard linear […]
  • AT&T go Phone Service for GSM Modules
    When playing with GSM/GPRS modules for Arduino and other platforms, one is faced with the selection of a cell phone carrier that supports such devices. This article is going to show how to use AT&T’s go phone service for GSM modules. For my SIM900 powered GPRS Shield V2.0 from seed [1] I needed to find […]


  • Measuring ambient noise level using a spectrum analyser #2
    The article Measuring ambient noise level using a spectrum analyser was a walk through of measuring ambient noise using a spectrum analyser. This article details a method that uses an online calculator to conveniently perform the calcs that permit more accurate answers by factoring the internal noise of the spectrum analyser into the calcs. Step […]
  • Online calculator of ferrite material permeability interpolations – additional materials
    I have progressively added some further materials to Ferrite permeability interpolations calculator. Of interest to European designers is inclusion of three common materials used for HF applications, Ferroxcube’s 4A11, 4B2, and 4C65. Last update: 22nd September, 2018, 7:27 AM
  • AE7PD’s transmitting loop measurements
    AE7PD documented his measurements of a 3.16m perimeter circular transmitting loop, 1.8m centre height above ground, that he made using 16mm copper tube and a split stator tuning capacitor: AE7PD gives the radiation efficiency on 20m as 30.5% or -5.2dB. I present here an alternative analysis of the antenna as measured on 20m. […]