I found this listing on the UK eBay https://www.ebay.co.uk/itm/New-Huawei-GTM900-P-GSM-Modem-Module-/282012574494 They ask international buyers to contact them, so I'm waiting for reply now. In worst case I can ask my contacts in UK to buy a few samples locally and send to US
On Tue, Jun 18, 2019 at 2:05 PM Mychaela Falconia < [email protected]> wrote: > Serg wrote: > > > Thank you Mychaela, this pretty nice platform as an alternative to C1xx > > phones. While it is not as robust as FCDEV3B, it makes it a usable > platform > > for some applications development. > > For anyone interested in playing with FreeCalypso just for fun and > recreating as closely as possible the environment which TI's own sw/fw > developers had in their offices or cubicles Back In The Day, this new > GTM900 find is definitely better than Mot C1xx, and only one step below > my FCDEV3B, which is in turn one step below TI's own D-Sample board > for which we have no schematics (thus no complete understanding), no > PCB layout files (thus no ability to make more of those boards) and no > tpudrv10.c module. The main advantages of GTM900 over C1xx are (1) it > is a modem rather than a phone, thus runs modem fw more natively > without VPM hacks, (2) both UARTs are brought out, allowing the full > TI/FC dual UART architecture to be fully enjoyed with GPRS, CSD and > the GSM 07.10 MUX, and (3) the GTM900 is unbrickable unlike C1xx. > > OTOH, for commercial applications needing a GSM/GPRS modem module, the > two biggest differences between the already existing and available > GTM900 and what I seek to produce if anyone ever funds it are (1) my > module would be at least triband and preferably quadband, and (2) my > module would have Calypso MCSI brought out for a digital voice > interface as recently proven on the FCDEV3B, a feature not present in > any of the historical commercial packaged modem modules with the > Calypso chipset. > > Also if anyone ever does fund the development of a new FreeCalypso > commercial modem module, I would like to make it more modular, excuse > the pun: instead of making a module with connectorized interfaces like > GTM900 from the get-go, the first version (the most basic core) should > be an SMT module more like BenQ M32, and once we have this basic core, > repackaging it into a form factor more like GTM900 for those who > desire such would be trivial. The rationale is that an M32-like > module can be trivially transformed into a GTM900-like one, but not > the other way around. > > > I have done a quick search for a dev board schematics and here is an easy > > find. > > On a short timescale schematics like the one you found aren't of any > help, as it is just schematics, not a PCB design which one could send > to a fab. On a longer timescale where I will be doing my own PCB > design for the breakout/interface board, those schematics aren't of > much interest either: they don't tell me anything I didn't already > know, and my version will be different in several ways. > > > I also found this document which describes some other variants of GTM900. > > Looks like 850/1900 band is supported in GTM900-P > > Now this one looks interesting! The PCB inside GTM900-B is designed > so it can be populated in one of two ways, for either dual-eu or > dual-us bands, so perhaps GTM900-P is the latter version indeed. > > > I'm going to get one and decap. > > I searched for places to buy a GTM900-P, and found only two sellers on > Alibaba (not Aliexpress), one listing the price as $50-90 and the other > as $50-99 per piece. Assuming that single unit quantities would be on > the upper end of this range, it is certainly more expensive than what > our friend Songbosi is selling the EU-band version for, but looking at > it the other way, it would still be cheaper than the cost of having > Technotronix and Falconia Partners LLC modify and recalibrate these > modules in California at USA fair labor rates. > > M~ > _______________________________________________ > Community mailing list > [email protected] > https://www.freecalypso.org/mailman/listinfo/community > _______________________________________________ Community mailing list [email protected] https://www.freecalypso.org/mailman/listinfo/community
