Amateur Radio Station – DL2MDU

What is QRP, what equipment do you neeed, what antenna is the best?Look for answers and information on QRP in the Menu

In my life as a Radio Amateur I loved to work holiday style from different Islands. Therfore I used wire antennas. But those antennas need trees or poles to hang it up. In the year […]

I wrote an article for the CQDL (DARC Amateur Radio Club Magazine) about the S-Match Coupler project. Then I have loaded a short presentation and the schematics to the website.

Schematic has been changed with C14 added as the screen bypass capacitor. Usually a screen bypass capacitor is built into the socket. There are sockets for Audio Amplifier without the capacitor. When I built that […]

The Band Decoder for the 6 to 1 Antenna Switch is working now very well. QSYing is easy going now! I wrote a new code and uploaded it into the Arduino NANO to fit it […]

After trying some different input circuits the conclusion was a series tuned circuit, with a 1 turn link coupling. The coil is 3 turns with ~3/8 id. The coupling loop is about halfway meshed. I […]

I am working at the cavity to improve the input. Because of high SWR I made some experiments with the input circuit. After testing the new input circuit I will show the results here.

A few years ago I have built a Z-Match tuner for QRO. I like antennas fed with open feeder and the priceless advantage of low less in the feeding line.   Continue …

Today I started assembling the new K3S Transceiver from ELECRAFT. I used a K3/100 since 2013 on Holidays. In April 2013 I have bought a K3/100 as a kit. Assembling was easy. Performance is outstanding. […]