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

  • Analyzing Feature Learning in Artificial Neural Networks and Neural Collapse
    Artificial Neural Networks (ANNs) are commonly used for machine vision purposes, where they are tasked with object recognition. This is accomplished by taking a multi-layer network and using a training …read more
  • Your QuickTake Camera And Your Modern PC
    An object of desire back in the mid-1990s might have been Apple’s QuickTake camera. In a form factor not unlike a monocular it packed a 640×480 digital camera, the images …read more
  • Electromagnetic Actuator Mimics Muscle
    Most electromagnetic actuators are rotating motors, or some variation on the theme, like servos. However, it’s possible to do linear actuation with electomagnetics, too. [Adrian Perez] demonstrates this with Linette, …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

  • AMSAT-UK Space Colloquium 2024
    AMSAT-UK is pleased to announce that the 2024 Colloquium will take place alongside the RSGB Convention at Kents Hill Park Conference Centre, Milton Keynes, MK7 6BZ on the weekend of 12/13th October 2024. As in previous years, the AMSAT-UK Colloquium … Continue reading →
  • July OSCAR News now available
    E-members of AMSAT-UK can now download the July 2024 edition of OSCAR News, issue 244, here. The paper edition edition will be sent to postal members and should arrive in the next 2-3 weeks. In this issue: • From the … Continue reading →
  • The Myth that Cosmonaut Yuri Gagarin was a Radio Amateur
    Every few years the myth that Cosmonaut Yuri Gagarin was radio amateur UA1LO crops up again. This myth started in the early 1980’s and has been debunked numerous times since but it still appears on websites listing “Famous Hams”. Martin … Continue reading →

RSS Gough's Tech Zone

RSS Compass Security Blog

  • SAML Raider Release 2.0.0
    SAML Raider is a Burp Suite extension and the tool of choice for many pentesters for testing SAML infrastructures. This blog post should give a brief introduction to what has changed in the new version 2.0.0. From Improving developer and user experience to bug fixes.
  • Introducing Conkeyscan – Confluence Keyword Scanner
    TL;DR Release of Conkeyscan – A Confluence Keyword/Secret Scanner, which is tailored towards pentesters. Secrets Everywhere Many companies, especially larger ones, need to store knowledge in a centralized way. A wiki is the usual choice for this. One product that is frequently used for this purpose is Confluence from Atlassian. Similar to how sensitive data […]
  • Blockchain / Smart Contract Bugs
    To identify and understand threats and weaknesses of smart contracts, it is important to be at least familiar with common smart contract bugs and vulnerabilities, how they can be leveraged by a malicious attacker, and how these issues can be mitigated. This blog article aims to raise awareness about common smart contract vulnerabilities and their […]

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

  • Common mode choke measurement – length matters #4
    Common mode choke measurement – length matters #2 discussed the effect that even quite short pigtails might have on the measurement of a high value resistor. This article documents an experiment to measure a DUT comprising two 1206 0.1% 5kΩ resistors soldered to a 2w section of turned pin male header strip. Above is the […]
  • NanoVNA-H4 radio remote trial #5 – NanoVNA enhancement
    A series of four articles explored different wireless solutions for remote operation of a NanoVNA-H4. The NanoVNA-H4 can use a USB connection, or a serial connection, the UART, selected from the configuration menu. The UART ‘channel’ is a conventional unprotected asynchronous protocol, 8N1, and supports a range of DTE speeds. Three different wireless remote solutions […]
  • Stand alone update of SiK radio firmware
    SiK is an inexpensive data radio commonly used by UAVs. At least two of the ‘ground station’ applications incorporate facility for firmware upgrade, but if you aren’t using them for their main purpose, it is a huge installation just to upgrade the SiK radio. The SiK radio project publishes a python script at https://github.com/ArduPilot/SiK/blob/master/Firmware/tools/uploader.py . […]