Re: [SDRSharp] From a SDR Grapevine...


Andrew \ Dobie\ Koch <k9ldt@...>
 

It sounds like the next generation of SDR dongles should use USB 3.0, or better yet Thunderbolt, instead of USB 2.0.

http://en.wikipedia.org/wiki/USB_3.0
http://en.wikipedia.org/wiki/Thunderbolt_(interface)

USB 3 has a max of 5Gbps and Thunderbolt 20Gbps. Couple that with a fast enough processor and memory, and you could easily cope with 6MHz, 10MHz, or even more, of bandwidth.

Andrew - K9LDT

On 8/13/2013 11:14 AM, Alberto I2PHD wrote:
You will need a lot of CPU power only when you are going up with the sampling frequency after the DDC.
For example, the latest DLL from Elad optionally can send a chunk of 6 MHz of band to the PC.
While this has the positive aspect of showing you about 4.8 MHz of alias-free bandwidth into which
perform your software-side tuning, this also means that the PC has to cope with 3 x 2 x 6e6 = 36 Mbytes/sec
of data. While this is still (barely) within the capabilities of an USB2 high speed interface, all those data
must be taken care of by the CPU.  Here an i5, or better yet, an i7 is mandatory, preferably one of the
new chips of the Haswell family.

73  Alberto  I2PHD



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