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Benedikt Heinz zn000h at gmail.comHi! 2011/5/29 Harald Welte <laforge at gnumonks.org>: > Hi! > > For those interested, I've taken apart the case and did some > investigation how the FCDP hardware architecture looks like. > > The results are available at > http://tetra.osmocom.org/trac/wiki/Funcube_Dongle That's quite interesting as the E4000 seems to handle all the analog stuff without external LNA, etc. Simplifies things a lot. > It seems the silicon tuner actually is intended for DVB-T, thus the > bandwidth it can down-convert is _much_ higher. However, the audio > codec that they use can only do 96kHz. > > That's actually really sad. I wish they had used something with higher > ADC rate. But it seems like even high-end audio codecs never get you > beyond 196/216 kHz - still insufficient for e.g. GSM. I wasn't able to find the output bandwidth of the E4000 somewhere on the website. Do you have an idea of the bw? Still, gluing a faster dual-ADC plus hi-speed USB IF to the tuner shouldn't be that much of a problem. It seems though, the E4000 can only be obtained from Elonics. No luck with digikey, R+S, farnell... Maybe we should try to ask Elonics if they'd be willing to provide some samples+datasheet and the DVB-T reference design. If we somehow could put an open design together, I guess we could find someone to build+sell larger quantities. I really would be interested in such a dongle w/ faster ADCs. What do you think? Regards, Benedikt / hunz