New Page added
I added a new page “S-Match Tuner”
New Antenna for 12 & 17 m
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 […]
New page added
I added a new page “RF-POWER LEVEL METER”
HF-Amplifier – Schematic changed
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 […]
Arduino Switch BAND DECODER & 6 to 1 ANTENNA SWITCH
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 […]
2M Amplifier “On The Air” again
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 […]
144 MHz Amplifier with GU74b
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.
Visiting ELECRAFT in California
This year my lovely wife (Heike, DL3HD) and I (Chris, DL2MDU) had a wonderful vacation in the Wild West of the USA. On our way from San Diego to San Francisco we had the plan […]
Remote Controlled ATU
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 …
ELECRAFT K3S – HF Transceiver
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. […]