Hello, many thanks for visiting the page of HB9PJT / AK4KE. See you on the air!
I was born in 1959 and married to Monika. We have two daughters (Tamara and Sabrina) and a son (Fabian, HB3YGH). I was educated as an electronic engineer. Previously employed as a product manager for electronic components and as a sales director in a software company. Today I work in my own IT firmwhich provides business-management software solutions, systems and networking for small- and medium-sized companies.
Licensed in 1978, I enjoy DXing and SSB contesting on the HF and VHF/UHF bands. Besides doing amateur radio in the shack at home, I enjoy making contacts with my HF mobile station and operating in the field. I also enjoy homebrewing amateur radio equipment and antennas.
Understanding Wireless Communication
“The wireless telegraph is not difficult to understand. The ordinary telegraph is like a very long cat. You pull the tail in New York, and it meows in Los Angeles. The wireless is the same, only without the cat.”
Yagi Antenna at Home HB9PJT
20, 15 & 10 m Force 12 C3SS 3-band 6-element Yagi; 2 elements per band. No traps and very rugged. Fine antenna working very well.
160, 80 & 40 m Dipolantenna at Home HB9PJT
The Antenna is 20 m & 20 m long. This box is remote controlled for bandswitching.
Compact Mobile Antenne
How comfortable, never to dismount when parking in the city. The antenna is only 40 cm long and has a good power efficiency because of the capacity hat. It is remote switchable from inside the car for 20 m and 15 m. The tuner of the TS-480SAT does finetune the SWR. Then there is a RX active antenna circuit built in for listening the low bands. At 20 m the signal strength is exactly equal to the Diamond HF20FX antenna which is 1.20 m long. With this little antenna I worked many times all continents in SSB with 100 watts.
Home Built 5-Band Portable Yagi
For relaxing portable enjoyments this antenna is doing a fine job. With its gain of 4.2 dBd and the ground gain of a good QTH with sloping ground the signal is very strong. A superior design of DK7ZB. Changing element length manually for band switching. With the correct core material the balun is working very well. I use a FT240-61 and 3x3 windings in the transformation section.
IC-703 Autonomic Manpack
I do not understand why there is no complete HF portable rig available with everything built in. So I had to add some components to my IC-703. The flat box under the rig contains 13.2 V and 2400 mA/h AA batteries. Then a telescopic whip with the additional tuning network to complement the internal tuner. That works fine between 20 and 6 m. There is also a switchable UNUN/BALUN with switchable output impedance for using with long wires and untuned symmetrical dipols without the need of carrying additional equipment. Very impressive to make a medium range QSO's with such a small pack and the telescopic whip!
More Power when Portable
Sometimes 100 watt are not enough. This project has not finished yet but should once become a 600 to 1000 watt solid state PA for shortwave weighting under 12 kg including autotuner and power supply. It consists of two IRF154 transistors. I hope it finishes once...
Home Built RX IMD Measuring Signal Generator
X-mas Contest 2014, 1st place in QRP class
X-mas Contest 2013, 1st place in QRP class
SSB Filed Day 2013, 1st place in QRP class
Portable when skiing in the mountens, 2013
X-mas Contest 2010 Portable from Canton of Zug
Only 40 and 80 m. So wire antennas are ok for the second place in SSB.
Home made vertical antenna with UNUN 1:4. Tuned by the internal autotuner of the Kenwood TS-480SAT. 20-6 m.The stick is a collapsible military antenna which is extended by a telescopic whip. Very compact and perfect for air travelling. The antenna was working very good. 40 to 60 QSO's per hour and ODX to India.
Home made vertical antenna with fishing pole and UNUN 1:9. Tuned by the internal autotuner of the Kenwood TS-480SAT. 20-6 m. The station contains of the TS-480SAT and a Gamma Research PS which is incredable small and perfect working. Everything is fix installed and wired in the box. So arranging the station is a task of only 5 minutes.
1792069 Last modified: 2015-03-17 21:03:58, 18320 bytes
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