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
One-Forever Radio
- Tune In to Fun: Planning the Perfect DJ Birthday PartyIntroduction 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 radioDigital 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 podcastsPodcasts 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 podcastsToday, 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.
Run my testbed experiment
- Network layer securityThe 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
- Address resolution protocol (ARP)In this experiment, we will examine how ARP is used in IPv4 networks - to resolve IPv4 addresses of neighbors into link layer MAC addresses and to keep track of the neighbor reachability. It should take about 60 minutes to run this experiment. You can run this experiment on CloudLab,
- Inspecting network traffic with tcpdump and WiresharkIn this experiment you will practice using tcpdump and Wireshark, two software applications for packet capture and packet analysis. Using these applications, we can capture raw network data as it arrives at or leaves any host in our experiments, save the raw network packets in a file, and analyze the
Blog – Hackaday
- Using a Framework Mainboard for a Custom Gaming HandheldBuilding your own handheld gaming console has been a popular project for many years, but recently it has become significantly easier to get a lot of power into a small …read more
- Proper Routing Makes for Many Happy Return PathsHere’s a question for you: when your PCB has a ground plane layer, where do return signals flow? It seems like a trick question, but as [Kristof Mulier] explains, there’s …read more
- The F Number On A Lens Means Something? Who Knew!The Raspberry Pi has provided experimenters with many channels of enquiry, and for me perhaps the furthest into uncharted waters it has led me has come through its camera interface. …read more
ZephrSec – Adventures In Information Security
- BlackVue Dashcams - It's not a bug, it is a featureBlackvue cloud connected dashcams leak your location and allow anyone to view your video feed with a free account. Sort it out folks!
- Failing Upwards: Put on your own mask before assisting others (Pt2)Reflecting on my experiences with various leaders, managers, and bosses, I've gained insights into effective and ineffective leadership styles.
- Failing Upwards (or not) (Pt1)If you find yourself on the path of leading a team, make sure you set critical baselines with your team. Always do what is best for your team and set them up for success.
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- Running Blink Example on Raspberry Pi PicoToday, 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 1Nodes 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 AnalyserFigure: 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 […]
AMSAT-UK
- BBC Great British Railway Journeys at SSTLSeries 15 episode 4 of Michael Portillo’s TV show Great British Railway Journeys: Havant to Guildford, features Surrey Satellite Technology Ltd and Professor Sir Martin Sweeting G3YJO. To see the segment fast-forward 20 mins 30 secs into the show. Watch … Continue reading →
- UK’s SaxaVord Spaceport to launch amateur radio satellitesTwo more amateur radio satellites, MARIA-G (HADES-F) and UNNE-1 (HADES-E), are planned to launch from the UK’s SaxaVord Spaceport later in 2024. Previously announced amateur radio payloads on the launch are: ERMINAZ-1U and -1V from AMSAT-DL GENESIS-MA and -ME from … Continue reading →
- IO-117 GreenCube to cease operating on February 5At 1622 GMT on Thursday, January 25, 2024 @S5Lab posted on X that the GreenCube IO-117 Digipeater would be permanently deactivated on February 5. Designed and developed by students of Sapienza University of Rome, GreenCube IO-117 was the first satellite … Continue reading →
Gough's Tech Zone
- Video Codec Round-Up 2023 – Part 18: ConclusionIt’s been a long journey for the project, taking up over half a year and resulting in 7,630 encodes taking upwards of 2.4TB of space, excluding analysis files and log files. But now that I have completed the full set … Continue reading →
- Video Codec Round-Up 2023 – Part 17: librav1e (“Fastest & Safest” AV1)At last, we come to the final codec in this round-up. This is the third software-codec option for AV1, produced by Xiph.Org foundation and marketed as being the “fastest and safest” AV1 encoder, known as librav1e. This codec is definitely … Continue reading →
- Project: Generate High-Quality Industrial Fire/Alarm Sounder Audio with PythonI can’t believe how fast 2024 is going by … Australia Day long weekend has already come and gone. Unfortunately for me, I spent it being rather sick with a flu-like illness which I’m still recovering from … but that … Continue reading →
Compass Security Blog
- Manipulating LLMs – How to confuse ChatGPTWhat are LLMs LLMs (Large Language Models) are language models with a large number of parameters. These parameters are the model’s variables, which it learns during training. Typically, this training is unsupervised learning on a large data set, during which the algorithm tries to find patterns in the provided data. The more it learns, the […]
- Luring the Threat: Lessons from ICS Honeypots in Ukraine and GermanyIn today’s interconnected world, it is a well-known fact that systems with Internet exposure are under continual threat of cyber-attacks. This risk extends from private websites to corporate infrastructure. With the increasing modernization of Industrial Control Systems (ICS), these vital components also become more exposed to such threats. But what is the extent and nature […]
- Microsoft BitLocker Bypasses are PracticalIn this blog article, we would like to share key insights from the "Defeating Microsoft's Default BitLocker Implementation" security training by Hands-On Security and emphasize the potential risks and consequences associated with this attack technique. Our target audience includes businesses looking to safeguard sensitive data on their Windows devices, as well as individuals with an […]
WordPress.com News
- Just Launched: GitHub DeploymentsSimplify your development workflow on WordPress.com with GitHub Deployments.
- Re-Creating The New York Times’ Website in Under 30 Minutes Using WordPress.comUsing WordPress blocks and the Site Editor to quickly build a lookalike of one of the most famous sites on the web.
- WordCamp Asia 2024: The WordPress Community Comes Together in TaipeiTaking a look at WordPress.com’s presence at WordCamp Asia 2024 in Taipei, Taiwan.
Nick Whyte
- Ender 3 v2 Pen PlotterLast 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 AnalysisOver 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.
Baltic Lab
- DIY: Adjustable 30 kV High Voltage Power SupplyHigh 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 LNBsThis 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 […]
- Tremolo DSP Effect for ArduinoThis article continues my newly acquired interest in implementing digital signal processing algorithms on the Arduino GIGA R1 by showing how to implement a tremolo effect algorithm in software. After showing how to implement an Audio Loopback Device and a DSP Diode Clipping Algorithm for Overdrive and Distortion Effects on the Arduino GIGA R1 WiFi, […]
owenduffy.net
- Mullard QY4-400 (4-400) x 2 Class C AM plate and screenValve datasheets often give one to few suggested sets of operating parameters for a valve in one several modes, and designers are left to sort of interpolate or extrapolate to their own set of parameters, eg loaded power supply voltage. This article is a walk through and comparison of RF Power Amplifier Tube Performance Computer […]
- 4:1 voltage balun vs 1:1 current balun on the MFJ-949E @ 1.8MHzA question of often asked is whether the ‘best’ balun on a T match ATU is: a Ruthroff 4:1 voltage balun (as it often fitted internally); a Guanella 1:1 current balun; or a Guanella 4:1 current balun. The subtext of the question is often that the OM has switched from (a) to (b) in pursuit […]
- Evaluation of Aliexpress sourced EBM315 battery packs (for DB3DL2)In Repack of Hikoki / Hitachi EBM315 battery pack (DB3DL2) I discussed the repack of a battery pack. At the same time I also ordered a no-name replacement 1.5Ah battery on Aliexpress for $25 incl shipping… with some reservation as most batteries I have purchased on Aliexpress have failed to deliver half of the rated […]