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 One-Forever Radio

  • Tune In to Fun: Planning the Perfect DJ Birthday Party
    Introduction Picture this: a dance floor bathed in pulsating lights, the beat of your favorite tunes reverberating through the room, and a crowd of friends […] The post Tune In to Fun: Planning the Perfect DJ Birthday Party appeared first on One-Forever Radio.
  • The difference between digital radio and internet radio
    Digital radio is not the same as Internet radio. Online radio uses a data stream received through Internet access via a computer, personal devices, or Internet-enabled radio. The post The difference between digital radio and internet radio appeared first on One-Forever Radio.
  • What’s the Difference Between a Podcast and an Internet Radio Show?
    Two of my most frequently asked questions are: "What are podcasts?" and "What's the difference between a podcast and an internet radio show? The post What’s the Difference Between a Podcast and an Internet Radio Show? appeared first on One-Forever Radio.
  • How to listen to podcasts
    Podcasts are available on devices that are connected to the Internet and can play audio. These are smartphones and tablets, laptops and desktop computers. The post How to listen to podcasts appeared first on One-Forever Radio.
  • Should businesses create podcasts
    Today, podcasts are among the most effective marketing tools. Taking into account available experience, it is possible to point out 5 main factors which indicate the prospects of creation The post Should businesses create podcasts appeared first on One-Forever Radio.

RSS Run my testbed experiment

  • 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 containers the HTTP2/TCP interfaces between network functions the NGAP/SCTP interface between the 5G gNodeB and
  • Network layer security
    The exercises in this experiment will focus on security services offered at the network layer of the TCP/IP protocol stack. You will configure a network with a VPN tunnel, and then you will examine the extent to which you are protected from unauthorized eavesdroppers on network traffic, when you

RSS Blog – Hackaday

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

  • Newfoundland QO-100 Contact Successful – More Planned
    On Saturday, May 11, 2024, Gopan VO1/M0XUU (VU3HPF) succeeded in making the first contact from North America through the amateur radio QO-100 geostationary satellite transponder located at 26° East. Gopan was in Newfoundland which is just outside the coverage area … Continue reading →
  • Newfoundland on QO-100 ?
    During May there are plans for two separate attempts to make contacts from Newfoundland using the QO-100 geostationary satellite amateur transponders. Newfoundland is just outside the coverage area of QO-100, the elevation at Signal Hill at St. Johns is -0.9°, … Continue reading →
  • GreenCube IO-117 Announcement by AMSAT Italia
    Rome, April 30, 2024 – AMSAT Italia is proud to announce the acquisition of the quote of property of the IO-117 “GreenCube” satellite. The other part of the property remains on behalf of “Sapienza University”, Rome, Italy. A collaborative work … Continue reading →

RSS Gough's Tech Zone

RSS Compass Security Blog

  • Bug Bounty: Insights from Our First-hand Experience
    At Compass Security, we recently launched our managed bug bounty service. We openly invite hunters to probe our publicly exposed services for vulnerabilities. In return for their valuable feedback, we offer monetary bounties up to CHF 5000. This blog posts presents an interesting vulnerability found by a hunter on the bug bounty program of our […]
  • New Burp Extension: JWT-scanner
    Authentication and authorization are critical components of any application. Various standards and frameworks have been developed to facilitate the development of such components and make applications more secure. Among them, JSON Web Tokens (JWTs) have become popular choice over the years. In this article, we discuss commons flaws in JWT-based authentication and present our extension […]
  • Behind The Scenes Of Ransomware Attacks
    This is hopefully the most useless blog post you will read this year as this post will detail our experience dealing with ransomware cases. It is one of the most common reasons why we get called in to help and it has become a big business. Chainalysis, for example, has tracked $1.1 billion in ransomware […]

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

  • DIY Spark Gap Transmitter
    This article plunges you into the mesmerrizing world of early radio technology through the assembly and analysis of a DIY spark gap transmitter. This project offers a practical insight into the fascinating dynamics of damped harmonic oscillators and explains charasteristics such the logarithmic decrement, decay rate, damping factor, q factor, and beyond. Prepare to spark […]
  • DIY: Adjustable 30 kV High Voltage Power Supply
    High voltage power supplies can open interesting doors to research topics such as laser, x-ray, spark gap transmitters. And many other specialized niches. Unfortunately, laboratory grade high voltage power supplies are rather costly. Luckily, there is a much less expensive way to put high voltage experiments into the hobbyists reach. This article shows how to […]
  • Diplexer with integrated Bias-T (Triplexer) for QO-100 and X-band microwave reception using LNBs
    This article shows how to build a simple Triplexer (Diplexer plus integrated DC Bias-T) for use with commercial TV LNBs for QO-100 or X-band microwave experiments. Introduction When using modified, commercial LNBs for reception of the QO-100 amateur radio satellite or X-band microwave experiments, it is necessary to pass a clock-reference signal, a DC supply […]

RSS owenduffy.net

  • Velocity factor measurement
    A frequently asked question is how to measure transmission line velocity factor. The wide adoption of the NanoVNA has spurred these questions. So, it is good that ownership of a NanoVNA stimulates thinking and search for applications of the instrument. I note that when these questions are asked online, early responses include recommendation of using […]
  • Measurement / evaluation of an RF filter response with NanoVNA
    One sees questions online about measuring a filter response using the NanoVNA. Let’s discuss filters, the DUT, for a moment. Filters are usually designed to operate with a given source impedance and given load impedance. It affects the response, and measuring a filter with different source and load impedance that it was designed for, or […]
  • The obsession with measuring extreme spot frequency impedances of broadband common mode chokes
    The fashion for measuring HF broadband common mode chokes for antenna systems is to use the s21 series through measurement technique, the basis for which is specious as discussed elsewhere on this blog. Let’s look at an example common mode choke, this time for suppression of ham transmitter ingress to a VDSL2 line. The spectrum […]