In my case it's just partly do-it-yourself: Michael and Peter did the cable soldering
and I wrote the software that controls the serial interface to the PMR
sender/receiver.
My gateway is on PMR channel 5 with no CTCSS configured in the Campus area of the
TU-Ilmenau. A gateway is only just a PMR radio connected to a PC which is logged into
a Teamspeak server which is connected to several other gateways (citizen radio / PMR
/ ...)
So if you talk within the range of my gateway you'll be heard in more than 24 areas
across germany over PMR and citizen radio.
Source: schrankmonster blog