Lately I bought a Zastone D9000 2m & 70cm radio without a programming cable (as always when I buy radios 😁). From online pictures of the original programming cable I reverse engineered the pinout and built my own one from a FTDI USB to TTL-Serial con

Recently I bought a cheap Surecom radio for 2m and 70cm. Unfortunately, this radio has no proper S-Meter, only a number that indicates the signal strength. In this article I tried to create a translation table to S-Levels. A Rohde & Schwarz SME03 was use

Warning: Since this article got so many views, I have to inform you that modifying your radio to transmit with higher power or out of the CB-band is illegal if you are not a ham. In addition: Warranty void Info: This article is regularly updated with new

Analog SSTV is still very popular on many ham bands and on CB. One way is to use mobile apps for receiving and transmitting pictures but this “acoustic coupling” between the radio and the encoder / decoder can reduce the image quality. Therefore, using an

When googling “packet radio soundcardmodem” you normally find solutions, which use Paxon with FlexNet. Unfortunately, FlexNet is very old and difficult to run on Windows 10. Due to this situation I searched for alternatives and found Dire Wolf. This sound

On this beautiful sunny day Alex informed me that the start of a new M20 sonde is planned and the landing site should be near my QTH. So, I immediately got ready by loding all my direction-finding equipment in addition to my radiosonde tools into my car b

Have you ever looked at Google's “Did you mean” field and wondered about the magical sorcery their servers use to interpret some kind of sensible meaning from your auto correct gibberish? Well, at least I have, but sorry to disappoint you I have got not a

You read the title correctly in this article I write about, how I implemented a naive dynamic memory allocator and some other facilities of the C standard library in Scratch of all languages. And no I didn’t use any JavaScript scripting to add custom func

Yes, I’m fully aware that I’m entering cursed lands. But still, I wanted to share this experience with the world, that is the result of a grumpy rant on garbage collected languages. The Scratch programming language is designed for beginners of young age

Yesterday's test at my university covered codes as one of its topics. As an example, EAN13 codes or barcodes as they are commonly known respectively were brought up. While preparing for the test we practiced verifying them and calculating missing digits.

In the latest episode of our endeavor to create a Brainfuck meta-compiler we got a first working version and learned about some interesting behaviors of the v8 JIT optimizer. When leaving off, I mentioned that there are still many opportunities left to im

After improving the execution speed by about four times in the last article of this series, we will try out a bit of a different approach. It is called “threading” and allows running the compiled code without the need for any branching inside the main loo

changpuak.ch: Antenna and filter calculators classeradio.com: Class E AM Transmitter Descriptions, Circuits, Etc. VK1SV: Class-E for beginners dmitrynizh.com: Create Spice Models for tubes b-kainka.de: Electronic projects funknetzplanung.com: RF-Cal

As a wise teacher once said: Only Vector Graphics don't give me eye cancer. Lock at that quality! This is really for testing vector graphics on this website.

Here you can find a list of radios and other devices that I use in my Ham Shack. I am currently remodelling the whole room so I have no recent photos to show at the moment. Moreover I am planning to use a raspberry as my main ham radio PC. A list of insta

Near my home-QTH is one of the tallest hills in the area, the so called "Haberg" which is 414 meters high. On its top sits a transmitting tower that every local knows but its purpose is widely unknown. Moreover, googling also reveals not much ab

A collection of QSL cards I received since I got more active on HF at the beginning of 2021. Via E-Mail

On Halloween we hold our second activity day for this month. We planned to do some SSTV and Packet radio in addition to talking but unfortunately the car of OM Nebi broke. Therefore, only two stations (AT3TEC, AT3BO1) were available on PR plus Nebi rode a