Amateur Radio Station – DL2MDU

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.

I added a new page “S-Match Tuner”

After more than 20 years of using a Cushcraft A3WS Beam, I wished to have a new antenna. The A3WS was doing a great Job over the years. But I was thinking about an antenna […]

I added a new page “RF-POWER LEVEL METER”

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 …