Skip to content


AI generated ham Rubik's cube fantasy

This is the website of me, the being, the person, who is a radio amateur (out of the 3 millions on this planet) holding the perfectly official and licensed unique identifier, the callsign: HA3FLT. This part of my website is dedicated to my technical hobbies, mainly for the radio amateurism, wireless electronics, and audio electronics. The main purpose of this site is to show off the eventually interesting moments of my ham life (the word "ham" is a traditional, non-pejorative synonym of the "radio amateur"), engineering activities like equipment building, measurements, and so on.

As for the appearance, although I will not place animated gif's onto these pages from the nineteen-eighties, the oldschool and anti-material looking minimal design is deliberate, enjoy it. :-) The "hand programmed" mostly CSS-only but entirely responsive and mostly WCAG compliant style I used to create these pages is a good opportunity to learn the nuances of HTML5+CSS3.

Also, there is no database, no Content Management System to update on a daily basis and occassionally fix broken tables in the database afterwards. There are a lot of radio amateur services that help with this approach (to store my accumulated data elsewhere), I just have to remember donate them for sparing my time and much more... So, I use simple, peaceful static pages with some JavaScripts e.g. to hide personal data from automated collection, and some CSS frameworks mainly for the sake of effortless compatibility between browsers, and for some ideas. Some PHP codes may also be used where necessary.

Why this hobby?

Picture of a Smith Chart

A randomly selected opinion: "RF Engineering is one of the most interesting and challenging parts of Electrical Engineering due to its high computational complexity of nightmarish tasks like impedance matching of interconnected blocks, associated with the practical implementation of RF solutions." (

Amateur radio (ham radio, see Wikipedia) is about making wireless, mostly two-way contacts - for the sake of making contacts. Not for communication (although you will make friends), not for broadcasting (except in emergency), not for making calculated links between two points, and not for chatting. But nobody's perfect, so we definitely do some of the latter. :-)

It traditionally incorporates the idea of fighting the ever changing propagation of radio waves of the bands by developing better equipments; radios, antennas, instruments. For the contacts (QSO's) that are more difficult to achieve, and for the joy of learning the vastly complex radio technology, just as the rock climbers enjoy the details and efforts of their battles against some earth formations and the elements.

The digital age has brought many improvements, which may seem to stir up the waters by making computing and the computers part of the equipment, including the receiver and transmitter circuits themselves, and yes, there is the internet to transfer lots of data easily - but there is no fundamental change in how enchanting radio waves are. Some of them still allow the very long-distance contacts between two stations on opposite sides of the globe. They can use state-of-the-art equipments, as well as cheap electronics and simple wire antennas using only the amount of energy necessary to light a small light bulb, and no other infrastructure is needed to succeed. Technological advancements have even opened up new areas of experimentation, allowing performances that analogue radio circuits and stages could never achieve.

So, let's see that ham biography...

HA3FLT's QSL, 1987

Now I'm over fifty, but I was very active in my formative years, and obtained my personal license in 1984. However, I wasted some cycles and countless sunspots in the following couple of decades.

I usually make contacts from my club stations (HG7F [HA5FMV], HG5C [HA5KKC]) locally or remotely as erecting an HF antenna at my home is unfeasible. Modes I use: mostly CW, SSB on occasion, sometimes digital (especially in the "AX25", packet era), and I also have DMR equipments those I turn on once a year.

These radio clubs above, which set up contest stations with serious antenna farms, have allowed me to be QRV on various bands (160m to 3cm) locally or remotely. These stations were first established decades ago, and have been under developement since. Once it was a huge work for both of them, and I have been trying to keep up with it and participating in the last five..ten years.

I started as an electrician, repairing many 80's electronic equipments, but I changed carreers, and have spent 30+ years in programming and system programming at this point.

I still enjoy learning RF technologies as a hobby, and I'm always homebrewing ham, audio, and digital gimmicks in my small but well-equipped shack. I enjoy quality literature and classical music - there is no full-grown mind without real aesthetics.

What else?

Electroacoustics and related problems. Science. Art. Intellectual qualities. Choices and professions. :-)

Desktop with N1MM+ with the remote controller 'Remete'
Desktop with N1MM+ with the remote controller 'Remete'
Stations that had heard my CQ on 14 MHz
Stations that had heard my CQ's once during a short period on 14 MHz