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

  • 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
  • Using AQM to manage "temporary bufferbloat" on mmWave links
    Background 5G wireless networks work on mmWave links which suffer from highly variable capacity and intermittent outages, during which a temporary "bufferbloat" condition occurs. In traditional networks, AQM (Active Queue Management) schemes are used to overcome the bufferbloat problem. However, AQMs were not necessarily designed to address bufferbloat on mmWave
  • TCP BBR for Ultra-Low Latency Networking: Challenges, Analysis, and Solutions
    In this experiment, we will show how to replicate the key result of the following published paper: Rajeev Kumar, Athanasios Koutsaftis, Fraida Fund, Gaurang Naik, Pei Liu, Yong Liu, Shivendra Panwar, "TCP BBR for Ultra-Low Latency Networking: Challenges, Analysis, and Solutions", in proceedings of IFIP Networking 2019, Warsaw, Poland. To

RSS Crazy Danish Hacker

RSS Blog – Hackaday

  • A Hybrid Helical Antenna for the Es’hail-2 Geosynchronous Repeater
    Amateur radio operators like to say that working a contact in space can be done with a simple handheld transceiver and a homemade antenna. And while that’s true, it’s true only for low Earth orbit satellites such as the ISS. If you want to reach a satellite in geosynchronous orbit …read more
  • Bringing an iPod to the Modern NAND Era
    Flash storage was a pretty big deal back in the mid ’00s, although the storage sizes that were available at the time seem laughable by today’s standards. For example, having an iPod that didn’t have a spinning, unreliable hard drive was huge even if the size was measured in single-digit …read more
  • Official Arduboy Upgrade Module Nears Competition
    We’ve been big fans of the Arduboy since [Kevin Bates] showed off the first prototype back in 2014. It’s a fantastic platform for making and playing simple games, but there’s certainly room for improvement. One of the most obvious usability issues has always been that the hardware can only hold …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

  • RSGB Tonight @ 8 Video – Getting started on QO-100
    On Monday, July 27 Dom Smith M0BLF gave an online talk – Getting started on QO-100 – as part of the RSGB Tonight @ 8 live webinar series. Dom’s lockdown project was to complete a set up for the QO-100 … Continue reading →
  • ISS MAI-75 SSTV activity planned for Aug 4-5
    It is planned Russian cosmonauts will transmit amateur radio Slow Scan Television (SSTV) images from the International Space Station (ISS) during August 4-5 on 145.800 MHz FM (likely using PD-120). It should be receivable across the British Isles and Europe. … Continue reading →
  • Ofcom statement on 5725-5850 MHz
    On Friday, July 24, Ofcom released their statement on 5725-5850 MHz and 5925-6425 MHz. The main points are: • Make 5925-6425 MHz available for Wi-Fi and other RLAN technologies • The release of this spectrum will also enable very low … Continue reading →

RSS Gough's Tech Zone

RSS Compass Security Blog

  • Make the most out of BloodHound
    During internal assessments in Windows environments, we use BloodHound more and more to gather a comprehensive view of the permissions granted to the different Active Directory objects. In this post, we'll show an advanced usage of this tool by using our additional queries.
  • Yet Another Froala 0-Day XSS
    Compass found a DOM-based cross-site scripting (XSS) in the Froala WYSIWYG HTML Editor. HTML code in the editor is not correctly sanitized when inserted into the DOM. This allows an attacker that can control the editor content to execute arbitrary JavaScript in the context of the victim's session.
  • Relaying NTLM authentication over RPC
    Since a few years, we - as pentesters - (and probably bad guys as well) make use of NTLM relaying a lot for privilege escalation in Windows networks. In this article, we propose adding support for the RPC protocol to the already great ntlmrelayx from impacket and explore the new ways of compromise that it […]

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

  • Calculation of impedance of a ferrite toroidal inductor – from first principles
    A toroidal inductor is a resonator, though it can be approximated as a simple inductor at frequences well below its self resonant frequency (SRF). Lets take a simple example, a ferrite toroid of rectangular cross section. The flux density in the core with current I flowing through N turns is given by . The incremental […]
  • nanoVNA – measuring cable velocity factor – demonstration
    The article nanoVNA – measuring cable velocity factor discussed ways of measuring the velocity factor of common coax cable. This article is a demonstration of one of the methods, 2: measure velocity factor with your nanoVNA then cut the cable. Two lengths of the same cable were selected to measure with the nanoVNA and calculate […]
  • nanoVNA – measuring cable velocity factor
    With the popularity of the nanoVNA, one of the applications that is coming up regularly in online discussion is the use to measure velocity factor of cable and / or tuning of phasing sections in antenna feeds. ‘Tuning’ electrical lengths of transmission line sections Online experts offer a range of advice including: use the datasheet […]