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)

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'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: 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

  • Using multicast for reliable low-latency communication over mmWave mesh networks
    In this experiment, we will see how multicast routing protocols can be used to mitigate delay in blockage-prone mmWave networks. It should take about 90 minutes to run this experiment. This experiment runs on the CloudLab testbed. To reproduce this experiment on Cloudlab, you will need an account onCloudlab, you will need to have joined […]
  • 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, on CloudLab, or on the new FABRIC testbed! Refer

RSS Crazy Danish Hacker

RSS Blog – Hackaday

RSS ZeroSec – Adventures In Information Security

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 […]


  • 23cm Band and RNSS Coexistence September Update
    As the WRC-23 approaches so the studies regarding AI9.1b (23cm and RNSS) are working towards conclusions. However the IARU is not content that all the operational aspects of the amateur service usage of the 1240-1300 MHz band are being properly … Continue reading →
  • AMSAT-UK Colloquium 2022
    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. Booking for the … Continue reading →
  • AMSAT-EA satellites to launch
    Felix EA4GQS reports Spain’s latest amateur radio satellites to launch will be GENESIS-G and GENESIS-J on September 11 The AMSAT Bulletin Board post says: This is to confirm that the launch of our new GENESIS-G and GENESIS-J satellites with Firefly … Continue reading →

RSS Gough's Tech Zone

  • Project: USB/LAN 40-Input 1W/2W/4W Solid-State Relay Multiplexer w/RP2040
    Running experiments has been a big part of my electronics hobby and having test equipment is quite important to making that happen. While I am most fortunate to have been involved in many element14 RoadTests and have had equipment donated … Continue reading →
  • Review: Iniu BI-B63 USB-C PD (65W) 25000mAh/92.5Wh Power Bank
    It’s been a while since I’ve reviewed a power bank, as I’ve been pretty happy with the units I have. However, I was approached by Iniu about reviewing their BI-B63 “ultimate” power bank under the review challenge terms and it … Continue reading →
  • Quick Review: Lenovo Smart Filament Bulb (G95/E27/806lm, SE-14BEA)
    I’m not much of a smart-home person, being technologically proficient, I tend to shy away from devices that seem to be fancy novelties with potential security drawbacks. But again, browsing OzBargain led me to a sale of these filament-style smart-globes … Continue reading →

RSS Compass Security Blog

  • Email spoofing in Office 365
    More and more companies use Microsoft 365, well even we at Compass-Security use it internally. Moving to the cloud solves many issues that our DFIR team had to deal with in the past years. Managed infrastructure means no ProxyShell, Hafnium, etc. We're grateful for that. Email authentication and security is another complex topic that was […]
  • Why You Should Implement a Banned Password List
    The ntds.dit file from a domain controller contains all password hashes of the domain. In a company with employees around the globe we were allowed to analyze the hashes. Here are the results, and the reason why you should implement a banned password list.
  • No Passwords More Problems
    Passwordless products promise greater security and convenience by allowing users to log in to Windows systems with only their smartphone. But what is going on behind the scenes and how could a domain's security stance be worsened by such a solution? In this post I will explain how these products are implemented and detail the […]

RSS News

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 The existing domain ( will simply perform a 301 permanent redirect to the new domain, so all existing inbound links should be unaffected.


  • Garden environmental telemetry project – part 1
    This is the first in a series of articles describing a simple maker / DIY IoT garden environmental telemetry system. The project is a derivative of IoT water tank telemetry project – part 1, and some of the optional components are as per that project (eg battery / solar power). The measurements of this (get) […]
  • Digital display for DIY 25W dummy load – part 4
    Digital display for DIY 25W dummy load – part 1 described a  digital display for a DIY 25W dummy load / digital wattmeter. The original research tested implementations on an Arduino Nano (ATmega328P) and Arduino Mini Zero (ATSAMD21). Though the Zero appears the better chip (32bits, better ADC resolution etc), the dev board is so […]
  • What kind of balun is this? Is it any good?
    The assembled experts on QRZ are commenting / analysing a balun shown on Wikipedia as I write this. The red strike through is mine, for this to work as a balun, the right hand section of coax MUST be an odd number of half waves electrically (yes, Wikipedia got it wrong). One commentator opines that […]