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Barnaby Astles bjastles at gmail.comJust a side note the octasic also would permit WCDMA/HSPA+ witch would be a good idea as it would permit us to explore the other half of the cell world. Barnaby J Astles Solutions Saminov inc 166 rue Cowie Suite 201 Granby, QC, Canada J2G 3V3 Cell: (450) 522-7153 Fax: (450) 372-8430 On Mon, Nov 29, 2010 at 12:25, David A. Burgess <dburgess at jcis.net> wrote: > We have tried a half-duplex BTS with OpenBTS, only transmitting on 3 slots > to avoid a duplexer, and it did not work very well. Most handsets would not > camp to it, even when it was the only signal available. So you need to deal > with the frequency duplexing problem and the antenna switch that you find in > a typical MS will not work. There are also some small-but-important > important changes in L1 and L2 that might not be possible in a highly > integrated, optimized product. > > > On Nov 29, 2010, at 12:29 AM, Hans Witvliet wrote: > > On Sun, 2010-11-28 at 23:49 +0100, Sylvain Munaut wrote: >> >>> Hi, >>> >>> My first reaction was one of sceptism, but according to the people of >>>> huwei it is do-able, no hardware changes needed, just some (major) >>>> software rewrite. >>>> >>> >>> With a single dongle ? Sounds weird. >>> >>> The "client"/MS side of GSM have no duplexer but a TX/RX switch and a >>> BTS needs to be able to TX and RX at the same time. >>> (to be easily detectable by phones. It could 'possibly' work without >>> it and phone would stay camped onces they are there but it could take >>> several try for them to 'see' the network). >>> >>> >> Indeed, i am still skeptic: seeing is believing. >> Got my HF-licence since 1978, so i know that it is very hard to do tx >> and rx on nearby frequencies. One needs extreme good (cavity) filters. >> Without those, even separate transmitters and receivers will not be >> sufficient, as your receiver input stage will be completely saturated. >> >> Eventhough "normal" bts must be capable of handling multiple handhelds, >> while these dongles needs only to communicate with just a single one, at >> extreme low power, there is not enough space inside for decent filters. >> >> Hans (PE1CXJ) >> >> >> > > David A. Burgess > Kestrel Signal Processing, Inc. > > > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/openbsc/attachments/20101130/d368e58a/attachment.htm>