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 experiment on GENI

  • 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
  • Multicast routing with PIM
    In this experiment, we will see how multicast routing protocols build a distribution tree between one or more multicast receivers and sources. It should take about 60-90 minutes to run this experiment. To reproduce this experiment on GENI, you will need an account on the GENI Portal, and you will
  • A peek into Internet routing
    In this experiment, we will see how traffic traverses the Internet across different autonomous systems. We'll use traceroute to sample some Internet paths. Then, we'll try to find clues about the routers along the path from the router hostnames. We'll also examine how traffic moves from one autonomous system to

RSS Crazy Danish Hacker

RSS Blog – Hackaday

  • Print Sewing Machine Parts Extend Singer’s Range
    [Grow Your Own Clothes] had finally found their ideal sewing machine for doing zig-zag stitches (/\/\/\) and converting to a treadle drive (mechanically foot-fed) — a Singer 411G. This is …read more
  • This Ham Radio is Unsafe at Any Frequency
    When we were kids we rode bicycles without pads and helmets. We drank sugary drinks. We played with chemistry sets and power tools. We also built things that directly used …read more
  • Building the DIY HP41C: A Field Report
    I have a confession to make. I write about a lot of projects for Hackaday, but there are very few I read about and then go actually build a copy …read more

RSS ZeroSec – Adventures In Information Security

  • AutoPoC - Validating the Lack of Validation in PoCs
    HoneyPoC was a project to look at how popular CVE PoCs could be. AutoPoC took that concept and enabled the mass creation of disinformation. Also, Data is beautiful.
  • LTR102 - Teaser
    I started writing LTR102 a while ago but have decided to release a teaser chapter of the new book for free for folks to check out and feedback on. This is the introduction and chapter 1.
  • ADExplorer Exporting Quick Tip
    Working with ADExplorer as a Red Teamer is really useful for seeing the whole domain in a single snapshot that can be looked at offline. There is minimal tooling out there for parsing ADExplorer or even exporting things and the closest I could find was ADEGrab but sadly it wasn&

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

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

  • 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 […]
  • Sending Secure Emails with OpenPGP
    Use of encryption in our electronic communication is essential to protect our security and privacy. Here's how we can use OpenPGP standard to send and receive emails securly. While there are many software tools to get this done, I prefer this way.1. Create a pair of GNU Pritty Good Privacy (PGP) keys using the following […]


  • FUNcube-1 (AO73) Celebrating eight years in orbit!
    November 21, 2021, marks the eighth birthday of the FUNcube-1 CubeSat. Remarkably the tiny spacecraft, launched from Russia on November 21, 2013, continues to work well having travelled more than a billion kilometres in space. During the past couple of … Continue reading →
  • ISS SSTV Dec 1 145.800 MHz FM
    Russian cosmonauts on the International Space Station (ISS) are planning to transmit Slow Scan TV images on 145.800 MHz FM using the SSTV mode PD-120. The transmissions are part of the Moscow Aviation Institute SSTV experiment (MAI-75) and will be … Continue reading →
  • Karl Meinzer DJ4ZC made DARC honorary member
    Former AMSAT-DL President Prof. Dr. Karl Meinzer, DJ4ZC, who was first licensed in 1957 aged 17, has been named a new DARC honorary member. He was awarded the AMSAT-UK G3AAJ Trophy in 2000. A translation of the DARC post reads: … Continue reading →

RSS Gough's Tech Zone

  • RoadTest Review: Rohm REFRPT001-EVK-001 8-Ch Power Tree Eval Board
    For the past month or so, I’ve been quietly reviewing yet another item bestowed upon me by the generous gods at element14 … … this very nice-looking Rohm Semiconductor REFRPT001-EVK-001 eight-channel power tree evaluation board. This board is targeted at … Continue reading →
  • Notes: Hyper Extension JN-1360 (H) 750W/1HP Treadmill Repair
    It would have been a long time, perhaps close to a decade, since my Dad decided to buy a treadmill. The treadmill in question was a bottom-end, abnormally-cheap K-Mart special. Branded Hyper Extension, it was obviously an import product which … Continue reading →
  • Review: Mushkin Source 2 1TB SATA III 2.5″ Solid-State Drive (MKNSSD21TB)
    The final installment of my flash-memory shopping spree is a 2.5″ SATA SSD. As I had a “shoestring” budget to spend and wanted something relatively capacious, I settled on the Mushkin Source 2 1TB (MKNSSD21TB). We don’t get much of … Continue reading →

RSS Compass Security Blog

  • Swiss Cyber Storm 2021 Wrap Up
    On October 12th the Swiss Cyber Storm conference took place in the Kursaal in Bern. Several Compass analysts attended the conference, our security analyst Yves Bieri held a talk and we also had a booth. The conference was great fun, finally a in-person conference with many interesting talks. This blog post wraps up some talks […]
  • Docker Forensics
    Sometimes one goes deep down the rabbit hole, only to notice later that what we were looking for is just under one's nose. This is the story of a digital forensic analysis on a Linux system running docker containers. Our customer was informed by a network provider that one of his system was actively attacking […]
  • SAML Padding Oracle
    ArcGIS [1] is a family of software providing geographic information system services. While testing a customer's ArcGIS architecture we came across a SAML login flow. In this blogpost we show how we found and exploited an AES-CBC padding oracle in this flow.

RSS News

  • Shining a Spotlight on Podcasts
    Interested in podcasting? In this post, we showcase podcasts in a wide range of topics and discuss how to stand out with your own podcast.
  • New: Free Blogging Course
    We have released a free course to help aspiring bloggers and content creators develop smart strategies and launch their sites.
  • VideoPress Remake
    Introducing the new VideoPress. Still the finest video service for WordPress—now even better. Video is one of the most powerful tools on the web. It can spark ideas, emotions, conversations, sales, and much more. VideoPress already offers people the ability to upload and serve hours of high-quality video flawlessly around …

RSS Nick Whyte

  • 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.
  • 100 Warm Tunas 2017 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 2017 would look like. Along the way we encountered a bug in the collection process, however data was backfilled and showed that I […]


  • RTKLIB using stunnel for TLS connection to NTRIP host
    RTKLIB does not currently natively support TLS, hopefully it will in time. This article details configuration of RTKLIB rtknavi to work on a Win10 workstation using stunnel to connect to a NTRIP server that is only available using TLS. The version of rtklib used is v2.4.3b33, and stunnel v5.60. Rover The GPS receiver used here is […]
  • nanoVNA – measure common mode choke – it is not all that hard!
    It seems that lots of hams find measuring the impedance of a common mode choke a challenge… perhaps a result of online expert’s guidance? The example for explanation is a common and inexpensive 5943003801 (FT240-43) ferrite core. Expectation It helps to understand what we expect to measure. See A method for estimating the impedance of […]
  • Chinese batteries – replacements for Makita 1220 battery pack
    Buying Chinese batteries is a minefield. Experience has been that they rarely meet specified capacity, and less that 10% of specified capacity is not that unusual. So, with that background I searched eBay for replacement batteries for a Makita drill / driver. The current pair of batteries are Chinese source, purchased about 5 years ago, […]