On Wed, May 27, 2015 at 04:21:43PM +0000, Spacefalcon the Outlaw wrote: > OK, so you haven't been using the MS-147 connector on C1xx either yet? > How were you connecting test phones to your USRP+OpenBTS setup then? > Over the air? Do you have a shielded room, or are both DL and UL > transmissions of sufficiently low power that no radio regulators come > knocking on your door?
The OpenBTS command-line interface has a power command. At 40dB attenuation, the signal goes to zero after a couple meters (phone doesn't see the network at all). So I believe even though I'm not in a cage, impact is minimal on the surroudings. I also use GSM 850/1900 phones with a foreign MCC/MNC, this way only my phone with the corresponding SIM card will try to authenticate. The ARFCN (working frequency) I chose is completely unsused, too. > It's just that every time I use a phone as a regular end user (Pirelli > DP-L10 running its original proprietary fw since the spring of 2013, > Motorola V66 prior to that, since 2003, seems to be a 2001 design), I > constantly find myself cursing at various bugs and misfeatures in > their UI design which I am powerless to fix because there is no source > code. These bugs and misfeatures won't go away on their own, hence > I'm working on this project to build a Free Dumb Phone that won't suck > - or at least the firmware for one. Fully agreed! > I suppose the specific UI misdesign issues I find myself cursing at > wouldn't be there if I were a smartphone user, i.e., if I were to > install QtMoko on my Freerunner and use it as an end user. But then I > wouldn't be able to share my joy with others - recommending that they > also get a Freerunner would be pointless as these devices are no longer > made and all unsold surplus is now exhausted - and the minimalist, > all-about-efficiency engineer in me revolts at the idea of using a > device with two processors and a full GNU/Linux OS to do a job that > has been very successfully accomplished with single-processor devices > using low-horsepower chips like Calypso running OSless or RTOS fw. I like this minimalist approach too! And as you said, it gives more control to the end-user, makes it easier to locate and fix bugs, and in the long term helps to better our understanding of the GSM protocol and how it's implemented in full. --DS _______________________________________________ Community mailing list [email protected] https://www.freecalypso.org/mailman/listinfo/community
