On Fri, Apr 22, 2011 at 7:14 PM, Marcus D. Leech
<address@hidden> wrote:
On 04/22/2011 01:54 AM, ton ph wrote:
>
> Hi guys ,
> I am using DBSRX , now i am trying to trace the data flow in the
> usr-gnuradio . I see AD9862 ADC in the usrp and some of the block
> diagrams , and i think that the daughterboard
> passes the analog signals to the ADC in the I and Q format . Please
> guide me if this is right or wrong ... Thanks .
>
That is precisely correct, yes. Most daughterboards use an analog
quadrature mixer to produce
a complex (I and Q) baseband signal.
The TV_RX is one that *doesn't* -- it's a conventional superheterodyne
receiver, with a final IF
frequency of (as I recall) 5.75MHz, which is passed to a single ADC
channel, and the FPGA
mixes it down to a complex baseband digitally using a digital
quadrature mixer.
--
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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