Re: [Discuss-gnuradio] New to gnuradio - Complex sampling question - urgent

[Sebastiaan Heunis]

Jason

>From what I've picked up, you need two external sampled signals to get
an I-Q signal.  With the TV tuner daughterboard, you automatically get
two signals.  You just need to set the mux accordingly.  When you use
a BasicRX, you need to feed the same signal to both inputs and use a
mux value of 0x32103210.

Sebastiaan

On Fri, Jun 12, 2009 at 5:50 PM, Jordan J Riggs<address@hidden> wrote:
> If I understand correctly, the real signal picked up by the antenna is mixed
> with two sine waves, 90 degrees out of phase, to create the I and Q
> components at baseband (depending on the daughterboard, there may be an
> intermediate frequency involved). The I and Q signals are then sampled by
> the ADCs. I and Q are then interleaved and sent over USB.
> See page 9 of the USRP FAQ for more info.
> http://www.scribd.com/doc/9688095/USRP-Documentation
>
> Jordan
>
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-- 
Sebastiaan Heunis
Radar Remote Sensing Group, University of Cape Town, South Africa
Tel:  +27 83 305 5667