YARH.IO is a fully hackable and custamizable Raspberry Pi based handheld, running Raspberry Pi OS and supporting all other Operating Systems available for Raspberry Pi.

On this page, I want to share and document my experiences flying and using a kite antenna. There's nothing too special about a kite antenna. It's a fun, novel approach to the ham's age-old question about where to hang a wire antenna. When I lived inland, I could usually find a tall tree in which to hang an antenna. After relocating to the Galvston Island, tall trees are hard to come by. While the beach may lack trees, it usually does not lack wind.
A kite antenna setup is pretty straight forward and once you deploy it a couple times, it's downright simple. The key factor is having enough wind!

Neugierig wurde ich durch eine Veröffentlichung von W9SCH in der SPRAT Nr.69 unter 'A Four-Band UP & OUTER Antenna' und später durch einen Artikel im QRP-Report. Die Antenne ist als 'Upper & Outer' bekannt geworden. Sie besteht lediglich aus einem vertikale Strahler, dünner Draht, der locker um einen Glasfiebermast gewickelt wird und einem horizontalen 'elevated' Radial. Dieses Radial, als 'zweiter Strahler' bildet das einzige Gegengewicht, keine weitere Erdung. 'Wenn Strahler und Radial die gleiche Länge, λ/4 haben, funktioniert die Antenne schon recht brauchbar. Ein Tuner sollte aber eingeschleift werden, um das SWR zu optimieren.

Amateur radio (Ham radio) operators and engineers, have been experimenting with radio and antennas since Marconi. The use of a kite to support an antenna makes for great days operating and a wonderful HF antenna.

The linked pages that are listed below describe
various elements of a typical kite-antenna flying
field setup. One important lesson that we have
learned so far is that good kite-antenna contacts
result from flying the best possible antennas.
Another lesson learned is to keep the time that is
required to set up and put away as short and
convenient as possible - otherwise we will not do it!

Admittedly, we already have a page about our kite antenna exploits which makes for interesting reading. However those pages are about the practical use of these antennas. This talk given by Henryk M0HTB covers some of the background and the equipment considerations to supplement the practical exploits.

Wer seinen PC in eine PDP-11 von DEC mit der UNIX Time-Sharing System Seventh Edition (V7) als Betriebssystem verwandeln möchte, der kann den Sanos-Port von Bob Supnik’s PDP-11 simulator ausprobieren. Denn mit Diesem ist es möglich, UNIX so auszuführen, wie es Dennis Ritchie und Ken Thompson im Jahr 1979 getan haben.
Ein Sanos-Entwickler hat ein ISO-Image mit Sanos, dem PDP-11-Simulator und dem UNIX V7-Kit vom Computer History Simulation Project erstellt. Einfach eine CD-ROM in den PC einlegen und starten. Danach wird für alle nostalgischen UNIX-Geeks der PC zu einer PDP-11 mit dem UNIX V7.

Have you ever wanted a theme tune to play as you enter the room? Perhaps the imperial march, a pop hit or Super Mario’s Jolly Roger Bay. Well now you can thanks to the Human presence triggered music player – a small box which will wait for your arrival and serenade you when you step in trough the door and switch the lights on!

It’s designed for service rooms but has applications for all kinds of locations and establishments. The music is stored on an SD card, which can be selected by pressing the knob – which also controls the volume when turned. You might like to have some relaxing music to accompany a deep bath or something to get you pumped up for the home gym – whatever you choose it’s an unusual and ingenious device. Simply let it play out or turn off the lights to stop the music!

I finally got far enough in my build to show my progress on creating an AGC DSKY as per MIT's original drawings.

How to build a replica DSKY unit using an electroluminescent driver circuit and screen-printed conductive ink.

This is VT-100 and XTerm compatible video terminal implemented on the PIC32 microcontroller. It has a serial interface with TTL or RS-232 signal levels, input from a standard PS/2 keyboard, and output to a VGA monitor. There is also a USB interface that supports serial over USB and acts as a USB-to-serial converter.

Over the years I’ve collected a rather messy ~/.ssh/config which resulted in some undesired behavior as a result of me misunderstanding how the config file prioritizes its options.

Today I investigated that.
In short, this is what I found:

Priority goes from top to bottom
Defaults MUST come last
Host specificity is NOT a factor of priority
Host sections can be specified multiple times
Multiple hostnames (and aliases) may be specified per section
Host sections apply to the name you use (not what it resolves to)

Typesense is a fast, typo-tolerant search engine for building delightful search experiences.

Features

Typo Tolerance: Handles typographical errors elegantly, out-of-the-box.
Simple and Delightful: Simple to set-up, integrate with, operate and scale.
zap Blazing Fast: Built in C++. Meticulously architected from the ground-up for low-latency (<50ms) instant searches.
Tunable Ranking: Easy to tailor your search results to perfection.
Sorting: Sort results based on a particular field at query time (helpful for features like "Sort by Price (asc)").
Faceting & Filtering: Drill down and refine results.
Grouping & Distinct: Group similar results together to show more variety.
Scoped API Keys: Generate API keys that only allow access to certain records, for multi-tenant applications.Synonyms: Define words as equivalents of each other, so searching for a word will also return results for the synonyms defined.Curation & Merchandizing: Boost particular records to a fixed position in the search results, to feature them.
Raft-based Clustering: Setup a distributed cluster that is highly available.
Seamless Version Upgrades: As new versions of Typesense come out, upgrading is as simple as swapping out the binary and restarting Typesense.

binenv will help you download, install and manage the binaries programs (a.k.a. distributions) you need in you everyday DevOps life (e.g. kubectl, helm, ...).

Think of it as a tfenv + tgenv + helmenv + ...

Now you can install your favorite utility just by typing binenv install something.

SSH continues to be a go-to command line tool for system administrators. These six guides reveal key ways that SSH plays a crucial role in getting the job done.

This is the Juuke box. The Juuke box is your own musical friend, made to be as easy as possible to use. It is especially designed to be used by elderly and kids, but can of course be used by all other ages. The reason we created this, is because of my girlfriend's grandmother.
She told me that her and her grandma sitting in the kitchen, listening to music, dancing and laughing. Sadly, through the last years, her grandma has been in and out from hospital. On her worst days, however, music is one of the few things that still makes her smile. And music players like CD players are just too hard to use for her. That’s why we created the Juuke.

The Juuke Box works by using RFID cards to play specific songs from an SD card. You could also play the songs randomly using the green button, or play and pause with the red button.

saw this cool project a little while ago right here on Instructables. The author Ananords created an RFID music player that could be used by children or people who might not have the capacity to be able to operate a normal mp3 player/device. The original project is called Juuke can be found here. He created this project for his girlfriend's grandma and it is the perfect project to make for someone with Alzheimers or Dementia. This bit really hit home for me, as I lost one of my grandparents to this awful illness and I know that she would have loved something like this.

The basis of the project is that the player has two buttons, one to play/pause the music and one to shuffle all of the songs. You can also select an RFID card and place it on the reader to play that particular song. It therefore takes some of the nostalgic parts of listening to music (like choosing a physical CD or cassette to play) and combines them with new technology making it accessible for those with certain needs.

Even though my Oma (Grandma) is no longer with us, I still wanted to make the project and when my parents were cleaning out some old things from their house, I came across my mum's old cassette player, and thought 'this is it'! I've used the cassette player as the basis for my very own Juuke. I put together everything as per Ananords' instructions and it all worked well, but I had a couple of other ideas that I wanted to incorporate including:

The ability to play an entire album from one RFID card,
The ability to skip to the next song,
The ability to play a 'side B' of the card, just like the side B of a cassette tape, and
Utilising the same amount of buttons, but incorporating long/short press functionality.

Call it the End-Fedz Trail Friendly killer if you like. This thing is much smaller and lighter, and a perfect match for the Mountain Topper series radios when you build in some traps or links.

Needed Materials:

• Special BNC connectors: https://amzn.to/38riPF7
• Toroids for this project are FT50-43: https://amzn.to/2NU7vbc
• Capacitors are 100 pF SMD ceramic 500V or 1kV models.
• 28 ga magnet wire: https://amzn.to/2AyjpEI
• Poly-Stealth 26 ga antenna wire. I've ordered from this company a few times and had great service: https://www.amateurradiosupplies.com/...
• 5 minute epoxy: https://amzn.to/2ZAAFRZ
• 5/8" or 3/4" heat shrink tubing (adhesive lined preferred): https://amzn.to/2VK5Rgq
• 3/32" or 1/8" heat shrink tubing: https://amzn.to/2NTnKFp

I’ve found the perfect enclosure for my Prusa i3 MK3 3D printer (no modification needed!). It’s a cheap server wall mount cabinet for only 79,- EUR. You can find it on ebay or in different computer online shops. It has 4 mm safety glass and powder coated sheet metal walls. The roof and bottom have cable entries and the roof is also prepared for mounting 2 x single fans. That may come in handy if you want to build a fume exhaust for ABS printing.

This cabinet is available in different sizes and colors. But you need the biggest one (with 15 Height Units and 600mm depth) and the Prusa i3 will fit perfectly. Also the heat bed cable on the backside of the i3 has enough space without touching the enclosure, no modification needed. Since this thing was meant to be mounted on a wall it’s baseplate is not that sturdy. Don’t use rubber feet directly on the bottom side of the enclosure it will be too wobbly! Instead screw a thick plywood board to the bottom side to give the enclosure more stability. On that plywoodboard you can now fix some rubber feet to it if you want to use it on your desk.

As a fan of Adam Savage's Tested I of course had to build his custom workbench LED lamp! So I designed a mount for the lamp to the Loc-Line system and a base to mount it to the table!