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

  • 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
  • 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.

RSS Crazy Danish Hacker

RSS Blog – Hackaday

  • Digital Multimeasure Helps You Get The Job Done
    In any mechanical field of work, accurate measurement is key to success. [Patrick Panikulam] knows this well, and decided to build a device that would be useful for some of the more tricky measurement tasks he was encountering. [Patrick]’s digital multi-functional measurement tool packs a bunch of useful hardware into …read more
  • Exploring The Dell N1108T-ON Ethernet Switch
    In an era where everything seems to be getting “smarter” every year, it will probably come as no surprise to find that even relatively middling networking hardware is now packing advanced features and considerable computational power. A case in point is the Dell N1108T-ON Ethernet switch. Despite only costing around …read more
  • Game Builder Lets Kids — Even Old Kids — Build Games
    One rite of passage back in the good old days of owning a TRS-80, Commodore 64, or similar vintage computer was writing your own game. It probably wouldn’t be very good, but it wouldn’t be much worse than most of the stuff that was out there, either. Today, trying to …read more

RSS ZeroSec – Adventures In Information Security

  • Mental Health and Security
    Mental health and mental wellbeing is very important and is often overlooked in the security industry. This post discusses the four most common issues and proposes some solutions.
  • 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

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

  • HS10KING on QO-100 geostationary satellite
    To strengthen the relationship between Thai and Japanese amateur radio operators representatives of the JAMSAT group of Japan have travelled to Thailand to visit the satellite ground station HS0AJ. They will operate from the Ground Station of the Radio Amateur … Continue reading →
  • ARISS contact planned for Rowan Preparatory School UK
    An International Space Station school contact has been planned for astronaut Nick Hague KG5TMV with participants at Rowan Preparatory School, Claygate, Surrey, United Kingdom. The direct contact between NA1SS and GB4RPS is planned for 1:48:55 PM BST (12:48:55 GMT) on … Continue reading →
  • WRC-23 Agenda Items may impact 144 MHz and 1240 MHz bands
    IARU Region 1 notes that there are two proposals under discussion in Europe as possible future Agenda Items at WRC 2023, which potentially could impact important amateur radio frequencies. IARU Region 1 has posted: The following sets out the current … Continue reading →

RSS Gough's Tech Zone

RSS Compass Security Blog

  • Reversing obfuscated passwords
    During internal penetration tests or Windows client hardening engagements, we often find configuration files with obfuscated passwords. The post demonstrates a general approach and required tools to effectively make use of such credentials.
  • Swiss QR Code Invoices for Phun and Profit
    Modern problems require modern solutions, this applies to the finance sector as well. So what problems am I talking about? Digital Invoices in a Mixed Payment Slip Landscape In Switzerland we are currently using multiple different variations of payment slips for invoices. There are four different types. Two of them are orange and the other […]
  • On Raising Awareness to Social Engineering Attack
    When attackers try to access confidential data, to steal money or simply to disrupt a business, they will often look for the weakest link to get inside a target network. In some case, this might be an outdated system exposed to the internet or an easy physical access to the network but quite often, 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 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

  • Average power of SSB telephony – experimental verification
    Average power of SSB telephony used 80 year old research by (Holbrook and Dixon 1939) to come up with a ratio of peak voltage to RMS voltage of a voice waveform, and from that derive the ratio PEP/Pav.. (Holbrook and Dixon 1939) explored the subject measuring the voice characteristics of many talkers (as there is […]
  • Power rating of a ferrite cored transformer or balun
    Commercial products often have power ratings that bear checking. There are common some key properties that are relevant: where loss is high, core loss tends to dominate; the specific heat of ferrite is typically quite high; the capacity to dissipate heat is related to many factors. Where loss is high, core loss tends to dominate […]
  • Average power of SSB telephony
    Some components used for SSB telephony need not be capable of handling the Peak Envelope Power (PEP) continuously, many components for instance respond to the average power (Pav) which is quite less. Essentially, components that are subject to voltage breakdown (usually as good as instantaneous) must withstand the PEP, those that heat relatively slowly must […]