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Gary Lawrence Murphy garym at teledyn.comso it is *designed* for FM? That's encouraging because mostly that is all I really need from it, only all my experiments so far have yielded only AM-quality sound, but it's good to hear because it means there's *hope* and so I'll just keep hanging in there until an FM recipe surfaces :) On Mon, Aug 13, 2012 at 7:58 PM, Adam Nielsen <a.nielsen at shikadi.net> wrote: > This clumsy Analog to Digital Converter / USB >> interface Chip, does not have the Audio dynamic range needed for my >> purposes. >> > > That's because it's only designed for FM radio. Anything more would have > been overkill for the manufacturer's purposes. This is still excellent > value for $20 and hasn't been much of a stumbling block for what most > people have been doing so far. > > The infuriating predilection it has to crash every time you want >> to shift frequency is another disadvantage. >> > > I'm not sure where you're looking in the docs, but if you're using > Balint's USRP ExtIO (as oppposed to the - I think - Osmocom ExtIO) then > there are two sets of code for the tuner. The default one offers slightly > wider frequency range, but crashes as you have seen. If you add > "tuner=e4k" to the device hint then it will switch to the newer code, which > doesn't crash, at the expense of having some gaps in the frequency coverage. > > First, I attached a high gain audio amplifier's input directly to the >> Tuner's output then to a 96K Sample per Second, 24 Bit Audio card to >> observe >> a high quality spectral image from the tuner. >> > > Presumably this reduces your bandwidth from 3.2MHz to 96kHz, which is > 24kHz too low to properly receive wideband/consumer FM radio. Since many > people are using the RTLSDR has a kind of glorified RF scanner, I am > wondering whether you're trying to do something you really should be doing > on a high end device like the USRP? > > Next is to hack into and record the I2C sent to the Tuner, so it may be >> controlled independent of that infuriating RTL2832. If anyone has done >> this, >> please share your code and understanding. >> > > Don't quote me on this but AFAIK the RTL just passes the I2C commands > through unchanged. This is how the existing E4000 tuner code was able to > be adapted to the RTL2832 so quickly. > > This list probably isn't the best place to ask about this sort of thing - > it's mostly developers focused on improving the hardware rather than > getting people started with it. I strongly recommend switching to the > ultra-cheap-sdr list[1] instead, which has many more people able to help > beginners. Your question about the device crashing is answered quite > often, for example. These people can also point you to the many 'getting > started' guides, which do explain clearly with screenshots where to put > device hints and the like. > > Cheers, > Adam. > > [1] https://groups.google.com/d/**forum/ultra-cheap-sdr<https://groups.google.com/d/forum/ultra-cheap-sdr>(you can subscribe via e-mail here if you don't want to use the web > interface) > > -- *Have Blog, Will Travel: blog.teledyn.com* *A Serviceable Substitute: post.teledyn.com* -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20120813/2c479ac1/attachment.htm>