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Here in the Netherlands we have a public organisation named Rijkswaterstaat. This organization keeps track of all the water in and around our country. Think about sea levels, locks in rivers, etc. To do so they have an extensive network…
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2014/01/clog-list-show.jpg)
There is a small but consistent group of users of my command line logbook software named ‘CLog’. The project has been hibernating for some years, however thanks to some user questions and issues I recently released version 1.2 (and today…
Last summer my old WS2300 weather station finally gave up, after 15 years of service. So I bought a new one, the Waldbeck Halley Professional Weather Station (also known as WH2650A-WIFI6C6F). This device can log some data (basic outdoor measurements)…
For just a few dollars you can buy a small board that acts as a bluetooth audio device. This board allows you to build your own bluetooth speaker. But why build a new speaker when you still have an old…
I often get questions about what filament I use for 3D printing, so I thought it would be nice to write a short article on this subject.
I always have been fascinated by growing things in an automated way. For instance, I absolutely adore the FarmBot project and would really like to build such a machine once I’ve got time and money for it. Until then, I…
Geocaching is a popular hobby here in The Netherlands. Since my wife and I search for these caches from time to time, the idea came to me to build a cache myself, one that challenges geocachers to listen and decode…
Almost every nerd is a fan of automation. So whenever we find a repetitive job, we think of a solution to automate it. Since I’m both into automation and amateur radio, I was thinking on automating one of my straight…
After three years of frequent operation, I decided to replace my Anet A6 3D-printer with the new Creality CR-10s Pro. I must say I’m very happy with this new machine in my shack: it’s easy to operate, the print quality…
Nowadays breadboards are often sold with a breadboard power module and a bunch of jumper wires included. This power module allows you to easily apply 5 and/or 3.3 volt to the power rails of the breadboard using an external power…
Time… For some reason we tend to stick to an ancient system which has no logic at all. Let’s be honest: if we would invent a new time system nowadays, it would probably not have 7 days in a week,…
During the summer season bats fly around almost every day in the twilight. I spot them in the evening, when they fly along our house and hunt for small flying insects, mostly mosquitoes and flies. Their soundless air show is…
Some years ago I provided some workshops on local radioclubs, demonstrating the capabilities of Arduino boards. Along with the workshop I handed out a quick reference card to get started. Recently I was asked to do another workshop, so it…
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Adrian PA0RDA heard about the SOTAbeams Go4Lo SWR-Power Indicator. Since it has an audible SWR indicator, it sounded interesting for blind operators. So he ordered a kit and asked me to build it. This article discusses my findings regarding this…
![[image]](https://www.pa3hcm.nl/wp-content/uploads/2017/03/20170318_160324-1-768x432.jpg)
Adrian PA0RDA bought a second-hand desktop charger for his Icom IC-92E handy. This charger (Icom BC-139) normally comes with a filler, allowing you to place the complete handy into the charger or just the battery. By flipping the filler a…
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2016/12/20161228_194010-768x432.jpg)
3D printers are getting more affordable now, and although I originally bought one for my wife, I was absolutely certain that it would be useful for my home brew stuff too.
Recently I have transferred the CLog software to my GitHub repository. I’m currently centralizing my code at GitHub since I wanted to get rid of sourceforge.net (my previous repository for CLog) and prefer GitHub nowadays.
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2015/12/20160102_144846-768x432.jpg)
The Neophyte receiver is an easy-to-build receiver, already built by lots of people. Many radio clubs used it as a project for starting builders. It was developed by John WA3RNC and first published in QST, February 1988. The circuit can…
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2015/12/Grimeton_VLF_masts-768x538.jpg)
This article is about receiving radio stations operating in the VLF band (3-30 kHz). Due to the very low frequency, receiving such stations requires some special equipment, since most radios don’t support these low frequencies. One of the interesting stations…
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2015/12/20151205_164646.jpg)
When you started discovering microcontrollers, you probably bought some kind of evaluation or prototype board. The microcontroller chip itself is placed in a nice socket on a PCB, surrounded by power circuit, some I/O, and RS232 or USB connector for…