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Nordin bouchtaoui at gmail.comDamn, your lab has serious equipment man! Wow! I mean, cool! :) dexter schreef: > Hi folks, > > In order that a rogue GSM-BTS can cause a lot of trouble with the > regulation offices there is a need for a dummyload solution. > > I have 2 ideas in mind: > > The first one uses attenuators to set up a direct wired connection: > http://root.runningserver.com/pub/desktop-gsm1.png > > The second one uses parasitic coupeling in a shilded box: > http://root.runningserver.com/pub/desktop-gsm2.png > > The second solution in my opinion the most save one because the BTS > does not send directly in its own receiver as well as the MS do not > send directly into the BTS. But i also think that this solution is too > crappy, i think there must be a more accurate way. > > The first solution fullfilly my demands in accurateness. The impedance > is 50 Ohms and attenuators ensure that the signal that is transmitted > between two points are attenuated enough - in theory... > > I have no experience in those things, i never connected a sender and a > receiver directly for measurement proposes. I am afraid to damage BTS > and/or MS by trying the first solution. > > What do you think, what would you do? How do you ensure that you do > not interfere with the with the official GSM networks? I think > sometimes it would be very nice to make 100% sure that no HF signals > leave the desktop. > > PS: One of my inspirations: http://www.comlab.hut.fi/Resources/GSM.html > > regards. > Philipp > > > >