[time-nuts] DTV tuner chip usable for GPS front end?
David J Taylor
david-taylor at blueyonder.co.uk
Wed Mar 21 17:07:24 UTC 2012
>> http://www.funcubedongle.com/
>>
>>but perhaps not fast enough for you.
>
> Or not wide enough in this case. The FunCube technical FAQ says the
> bandwidth is about 80 KHz as it is designed for narrow band reception
> only and accessed as a standard USB sound device. I do not quite
> understand how 96 Ksamples/sec yields 80 KHz though:
>
> Q. What is the bandwidth?
> A. 96kHz is the quadrature sampling rate. Once the ADC's decimation
> filter skirts have been taken into account, you have about 80kHz.
.. because they are quadrature samples, so it's +/- 40 KHz. In fact some
of the software driver the device at 192 KHz, yielding almost enough
bandwidth for FM stereo (but not quite). +/- 80 KHz RF, about 80 KHz
baseband.
Cheers,
David
--
SatSignal software - quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor at blueyonder.co.uk
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