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Michael Spacefalcon msokolov at ivan.Harhan.ORGPeter Stuge <peter at stuge.se> wrote: > It would be neat if you choose a filter part with a footprint that > can also accomodate a balun more easily than in the Compal phones, Actually my hope is to build a quad-band phone (unlike the dual- or tri-band ones we have so far) by copying this reference design from TI: ftp://ftp.ifctf.org/pub/GSM/Calypso/Leonardo_plus_quadband_schem.pdf [The above PDF came from one of the Chinese sites; the /pub/GSM directory of my FTP site above is my own sort of mini-Wikileaks for all things dealing with the Calypso and related things - I encourage everyone to check out the collection of goodies which I've accumulated so far, and which only keeps growing. :-)] As you can see on that schematic, instead of using separate antenna switch and Rx SAW filter parts, the Leonardo reference boards used integrated RF front-end modules - in the case of the quad-band Leonardo Plus, it's a quad-band RF FEM that works perfectly with the Rita. The specific part on that Leonardo+ board seems to be Epcos M034F. A quick search for that part hasn't shown up any availability, but then it was only a very quick search, and even if that specific part isn't available, I reason that there must be functional equivalents from other manufacturers. > so that a phone could be assembled "either way". You mean a filterless sniffer version? I have to admit that sniffing and other GSM hacking aren't really my areas of interest - instead all I want is a 100% "normal" cellphone, but with just one difference: running software/firmware whose full source is physically available (be it legal or otherwise) for the exercise of the Four Freedoms defined by the FSF, as a moral requirement. SF