Here some information about my amateur radio station. The photo shows a 3 band quad antenna for the 20, 15 and 10 metre amateur radio bands.
The full wave loops are matched to 50 ohms via a 75 ohm feed line. The top of the antenna reaches about 17 metres when the telescope mast is fully extended. My transmitting power is 100 W from  an  ICOM IC-7410.

Detailed drawing of the antenna
Returnloss 10m
Returnloss 15m
Returnloss 20m

Please find below various electronic projects:

Batterieinnenwiderstandsmessgerät 




70cm UHF Transceiver with DRA818U Module




Geiger Counter Home-Made





2m FM Empfänger mit SI570 als Lokaloszillator





Aktives 2.1 Lautsprechersystem für den PC





HF Generator mit DDS AD9951 und Mikrocontroller Atmel AT90S8515




ATMega88 mit SI570 LCD und Drehimpulsgeber


Zwei-Wege-Lautsprecher mit High-End-Chassis

QRL Microwave Antenna Collection:




Email:  dl3etw@hotmail.com

Last update:
1st of January 2022