DL3RTL can often be heard on es'hail 2 and LEO satellites in portable operation.
Transmission power of DL3RTL/p portable operation is 2 watts and with DL3RTL at home 20 watts.
I often operate on satellite with a portable equipment. In 2008 I developed the famous DL3RTL-Arrow-Antenna for 2m and 70 cm. The full construction manual can be found in german language on the web.