After prolonged Gedöhns installing it is then but still managed to get the adapter up and running.
The problem is that the wireless adapter
# 1) a visible SSID required
# 2) endures during initial no MAC filtering (because he does not announce its MAC address) and
# 3) no 802.11n support. (Although that is advertised !!)
None of this is particularly "up-to-date".
So visible during installation make SSID off and "down cycling" wireless speed MAC filtering.
Following I have succeeded, MAC filtering back on.
Now it works very reliable - it's also streaming over the wireless network to PC or from the NAS drive on your network - so you can watch movies from the NAS via the Digi-Corder in TV. But enough of the 802.11g standard.
Annoying and remains that now the whole wireless network is down clocked in the transfer speed. My laptop will not do so great ...