>
> Rule number 1 in SDR: Anything that can be created in hardware can
> also be created in software, including I-Q mixers and LO's
>
Theorethically yes, but not in practice...
The ideal scheme would be to attach an analog to digital converter to
an antenna. The PC would read the converter, and then software would
transform the stream of data from the converter to any other form.
The ideal scheme is not practical, however, as you would need a high
speed ADC, with the adequate number of bits of resolution. Today's
technology doesn't offer 100 MHz, 24 *real* bits ADCs.
So you are forced to convert the range of frequencies you are
interested in to a more manageable value, and for this you need a
mixer, and you need to get rid of the conversion image frequency. This
latter step can be done exclusively in hardware, not in software. If
you know of a way to do it in software, please tell me, I will be
delighted to learn it.
And if you patent it, and you sell it to the cell phones
manufacturers, you will also become a rich man.
73 Alberto I2PHD
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