This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/OpenBSC@lists.osmocom.org/.
Harald Welte laforge at osmocom.orgHi Mychaela, On Fri, Sep 11, 2020 at 09:54:37AM -0800, Mychaela Falconia wrote: > > Throwing a quick glimps at the OsmoTRX wiki page I think the cheapest > > hardware that should work well is the LimeSDR - coming in at around 300 USD. > > Looking around myself, I came to the same general conclusion - but > there are several different members of the Lime family. It looks like > LimeSDR-Mini is the cheapest of all of them, but does it have some > problem compared to the original LimeSDR-USB? LimeSDR-USB is the oldest and best supported device. LimeSDR mini does not have a clock input for an external reference clock. Yes, with some board rework it can be added, but even then it has much stricter requirements on the clock (IIRC phase noise), as it doesn't have any onboard PLL but directly feeds that input to the Transceiver chip which is very sensitive to phase noise. > Does it have a worse clock that isn't good enough to run a GSM BTS? Any SDR without a a built-in or external OCXO, Rubidium or GPS-DO has a clock that is insufficient for operating a GSM BTS. > And what about LimeNET-Micro? It appears to be priced the same as the original > LimeSDR-USB, but has a built-in RPi microcomputer that the software > would run on, and its GPSDO seems like a better clock option than all > of the predecessors - but I could be missing something... OsmoTRX + OsmoBTS will run on it (and we actually even provide Raspbian binar packages in our nightly and latest feeds, for people who don't want to build everything from source). Please note that - as far as I know - the CPU power of the RPi compute module is insufficient for operating multiple software transceivers/carriers within one wideband channel ('multi-arfcn mode'). So you are constrained to 1TRX operation. If you don't need that, the LimeNET-Micro might be a good choice. If you do, go for a LimeSDR-USB within the Lime device portfolio, but add a GPS-DO like a BG7TBL if you don't already have a 10MHz reference around in your lab. -- - Harald Welte <laforge at osmocom.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)