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 Run my testbed experiment

  • UAV-assisted wireless localization
    You've been asked to contribute your machine learning expertise to a crucial and potentially life-saving mission.A pair of hikers has gone missing in a national park, and they are believed to be critically injured. Fortunately, they have activated a wireless locator beacon, and it transmits a constant
  • Exploring the 5G RAN
    In this experiment, you will explore the 5G RAN by bringing up an end-to-end 5G network on a single server. You will see:how a 5G RAN can be split with the CU (centralized unit) handling SDAP, PDCP, and RRC layers, and the DU (distributed unit) handling RLC, MAC, PHY
  • Exploring the 5G core network
    In this experiment, you will explore the 5G core network by bringing up an end-to-end 5G network on a single server. You will see:how 5G core network functions can be deployed in containersthe HTTP2/TCP interfaces between network functionsthe NGAP/SCTP interface between the 5G gNodeB and

RSS Blog – Hackaday

  • Cyberdeck Build Gets Closer To Regular Laptop Than Most
    Cyberdecks are typically reminiscent of weird computers in futuristic sci-fi films, moreso than the computers of today. The cool thing about cyberdecks, though, is you get to build them however …read more
  • Growing Aluminium-Copper Alloy Crystals Using Hydrogen
    Having molten aluminium interact with atmospheric water forms a source of hydrogen which can be rather problematic if you’re trying to cast aluminium parts. As the molten metal cools down, …read more
  • Making the Most Pick-Proof Lock Yet
    Throughout the centuries the art of lock-making and lock-picking have been trapped in a constant struggle, with basic lock designs being replaced by ever more complex ones that seek to …read more

RSS ZephrSec – Adventures In Information Security

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

  • Running Blink Example on Raspberry Pi Pico
    Today, I managed to find some time to try out a Raspberry Pi Pico module that had been awaiting my attention at the lab for some months. More details about this module can be found in their website's documentation. The following are the steps that I followed to get their default LED blink example running […]
  • Fundamentals of Radio Tomographic Imaging - Part 1
    Nodes vs Links Consider a wireless network consisting of \(K\) number of devices. If each and every device is communicating with each other, there will be a wireless link between each and every pair of nodes. The number of such unique two-way links is depicted as \(M\). The following equation describes relationship between \(M\) and […]
  • Observing I2C Communication using Logic Analyser
    Figure: Connectivity between a master (controller) and slaves (target). (source: https://en.wikipedia.org/wiki/I²C)Inter-integrated circuit (I2C) protocol is an advanced protocol, that eliminates many weaknesses in the UART and SPI protocols to provide communication between ICs using minimum number of wires. I2C consists of just two wires interconnecting one or many master devices with one or many slave […]

RSS AMSAT-UK

  • ISS Astronaut to use Amateur Radio to Talk to UK Students
    Students at Simon Langton Grammar School for Boys will use amateur radio to speak to astronaut Jack Hathaway, KJ5NIV, on the International Space Station (ISS).  The ARISS contact, between NA1SS on the ISS and GB4SLS at the school, will take … Continue reading →
  • Students On The Air Satellite Activity Starts March 3
    AMSAT has announced the launch of Students On The Air (StOTA) Days, a new initiative aimed at encouraging student participation in amateur satellite operations. The activity was inspired by AMSAT President Drew Glasbrenner, KO4MA, and his son Carsten, KQ4SJM, and … Continue reading →
  • Wick High School students to contact ISS
    Students at Wick High School in East Caithness have been chosen by ARISS International to have an amateur radio contact with an astronaut on the International Space Station. The Wick High School Radio Club @GM0WHS posted on X: HUGE NEWS … Continue reading →

RSS Gough's Tech Zone

  • Teardown: A Dead Arris CM8200B NBN HFC DOCSIS 3.1 NTD
    While I’m still living the 5G/LTE life myself, other remote family members still opt for the NBN. In the case of my aunt, she’s been on the NBN since October 2021, at the time suffering delays from migrating her connection … Continue reading →
  • Tested: eSimFLAG “Unlimited Data” Travel eSIM
    Thanks to an OzBargainer by the name of neil, back in February, I had the chance to test yet another travel eSIM free-of-charge, this one from eSimFLAG. The company itself belongs to the Telefonica group, a Spanish multinational telecommunications giant, … Continue reading →
  • Note: USB Charging & Mains Power Sockets on Sydney Trains Intercity Mariyung Fleet
    Hello blog! It’s been a while. At last, I’ve finally returned home after being in London on business (and personal) travel for approximately two weeks. It was quite the trip – rather than a holiday, I turned it into a marathon … Continue reading →

RSS Compass Security Blog

  • Common Entra ID Security Assessment Findings – Part 4: Weak Conditional Access Policies
    This post is part of a small blog series covering common Entra ID security findings observed during real-world assessments. Each article explores selected findings in more detail to provide a clearer understanding of the underlying risks and practical implications. Conditional Access Policies Conditional Access policies are among the most important security controls in Entra ID. […]
  • Common Entra ID Security Assessment Findings – Part 3: Weak Privileged Identity Management Configuration
    This post is part of a small blog series covering common Entra ID security findings observed during real-world assessments. Each article explores selected findings in more detail to provide a clearer understanding of the underlying risks and practical implications. What Is Privileged Identity Management? Privileged Identity Management (PIM) is a service in Microsoft Entra ID […]
  • Common Entra ID Security Assessment Findings – Part 2: Privileged Unprotected Groups
    In part 2 of our 4-part series on common Entra ID security findings, we show how seemingly harmless group configurations can be abused to bypass security controls and gain high privileges. The post shows scenarios where insufficiently protected groups are used to: weaken Conditional Access protections for administrators enable privilege escalation through PIM for Groups […]

RSS Nick Whyte

  • Ender 3 v2 Pen Plotter
    Last year I purchased myself an Ender 3 V2 3D Printer. It was a logical purchase, to compliment my home automation hobby, allowing me to design and print custom enclosures for miscellaneous ESPHome and Zigbee nodes. It turns out having a CoreXY 3D printer allows you to do more than just 3D printing if you’re […]
  • 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.

RSS Baltic Lab

  • Conducted Emissions on the Bench: Implementing the CISPR 25 Voltage Method
    This article pulls back the curtain on CISPR 25 conducted-emissions testing, demonstrating how a fully functional voltage-method setup can be built and operated on a standard lab bench. This approach shows how conducted emissions can be characterized with precision using accessible tools and a carefully structured setup, while walking through all critical elements needed to […]
  • WebP-Images without Plugin
    WebP is a modern image format which shines through its fairly small filesize. Google recommends through their PageSpeed Insights that all PNG- and JPEG-files should be served as WebP images instead. There are of course plugins to facilitate the automatic generation of WebP versions of existing images but a few lines of PHP code and […]
  • Firewall Rules with (dynamic) DNS Hostname
    Updating and installing new firewall rules on remote servers always comes with the risk of locking yourself out completely. Many server administrators have inadvertently lost access to their servers, including SSH access, at some point due to a moment of inattention. This article shows how to install a backdoor on your own server that can […]