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 testbed experiment

  • MPCC : Online learning multipath congestion control
    Background Multipath transport deals with the transmission and reception of internet traffic using multiple network paths at the same time. Multipath transport capability can be used to increase the effective network throughput for bandwidth hungry applications. Alternatively, multiple network paths can also be used to increase the reliability of communication.
  • Adaptive video
    This experiment explores the tradeoff between different metrics of video quality (average rate, interruptions, and variability of rate) in an adaptive video delivery system. It should take about 60-120 minutes to run this experiment. You can run this experiment on GENI or on the new FABRIC testbed! GENI-specific instructions To
  • Coexistence of delay-based TCP congestion control
    Background With the emergence of delay-sensitive applications like cloud gaming, remote driving, and virtual/augmented reality (VR/AR), low latency networking is more important than ever. Consequently, there has been renewed research interest in the development of low latency congestion control protocols. However, these efforts have been impeded by the

RSS Crazy Danish Hacker

RSS Blog – Hackaday

  • Upcycled Practice Amp Build Goes to Eleven
    What do you call someone who gives the toddler in your life a musical instrument as a gift? In most cases, “mortal enemy” is the correct answer, but not everyone …read more
  • Robotic Hand Uses Old CD-ROM Parts
    Robotic arms and actuators are compelling things to watch, and as popular among the maker set as they are crucial to modern industry. [kthod2000] built a design of their own, …read more
  • Auditory Brainstem Implants: The Other Bionic Hearing Device
    You might have heard of the cochlear implant. It’s an electronic device also referred to as a neuroprosthesis, serving as a bionic replacement for the human ear. These implants have …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( );

  • Creating a Window 10 Live USB Stick on an Ubuntu GNU/Linux Computer
    As a hardcore user of GNU/Linux systems, I don't usually come across any requirement to use Windows operating system. However recently, I had to install Windows in somebody else's computer as a help. It took me a while to find out how to prepare a installation USB drive for the purpose. Here's the steps I […]
  • Enabling Hibernation in Ubuntu 20.04 LTS using a Swap File
    Enabling of the hibernation option on Ubuntu 20.04 LTS didn't work in the way I used to do. So, I had to explore further and do it slightly differently. This blog post records those things I did to get hibernation option working.1. First of all, create a swap file using the following commands.sudo fallocate -l […]
  • 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 […]

RSS AMSAT-UK

  • AMSAT-UK Colloquium 2022 – Call For Speakers
    This is the first call for speakers for the AMSAT-UK International Space Colloquium 2022 to be held as part of the RSGB Convention on October 8-9 at the Kents Hill Park Conference Centre, Timbold Drive, Milton Keynes, MK7 6BZ. https://amsat-uk.org/colloquium/ … Continue reading →
  • AMSAT-UK Space Colloquium October 8-9
    AMSAT-UK is very happy to announce the 2022 AMSAT-UK International Space Colloquium will be held as part of the RSGB Convention on October 8-9 at the Kents Hill Park Conference Centre, Timbold Drive, Milton Keynes, MK7 6BZ. The weekend event … Continue reading →
  • Amateur Radio and AMSAT-UK at EMFcamp 2022
    The popular Electromagnetic Field event takes place June 2-5, 2022 at the Eastnor Castle Deer Park, Herefordshire, UK. Imagine a camping festival with a power grid and high-speed internet access; a temporary village of geeks, crafters, and technology enthusiasts that’s … Continue reading →

RSS Gough's Tech Zone

RSS Compass Security Blog

RSS WordPress.com News

  • Introducing WordPress Starter: Make Your Mark
    Every site starts with an idea. WordPress Starter is a new, beautifully pared-back plan designed to put that idea center stage. For just $5/month. Like the WordPress Pro plan (more on that below), WordPress Starter brings you the fastest WordPress managed hosting on the planet. Unlimited site traffic. And a …
  • Your Website Looks Great. So Should Your Emails.
    A Fresh New Design For Subscriber Emails We recently rolled out some fresh, flavorful updates to the design of the emails that go out to your subscribers when you publish new posts to your site. With this new design update we worked on modernizing the out-the-box email templates that come …
  • New: Free SEO Course
    The field of search engine optimization is complex and the sheer volume of information can be daunting and overwhelming. That's why we’ve launched our latest course to provide a straightforward and easy-to-follow introduction to the world of SEO.

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 owenduffy.net

  • Center-Fed Dipole : elements length for a Z=200 +/- 0j ohms
    A chap asked online for dimensions of a 50MHz dipole with a feed point of 200+j0 to suit 50Ω feed line and a 1:4 coax half wave balun. The “+/- 0j” is hammy Sammy talk from an ‘Extra’. It is an interesting application, and contrary to the initial responses on social media, there is a […]
  • Another small efficient matching transformer for an EFHW – 2643251002 – #3 – thermal measurement
    The article Another small efficient matching transformer for an EFHW – 2643251002 – #2 – prototype bench measurement continued the development of a transformer design. This article presents thermal measurements. Losses were predicted from a model as follows. Loss in watts is in red against the right hand axis. Loss is greatest at around 3.6MHz, […]
  • Sontheimer coupler – transformer issues – an alternative design – FT37-43
    Sontheimer coupler – transformer issues discussed problems with the Sontheimer coupler in a recently published QRP transceiver, suggesting that the core loss in transformer T2 was excessive. This article presents an alternative design for the transformer for a coupler for a 5W transmitter. The above circuit is from (Grebenkemper 1987) and is an embodiment of […]