Re: [Discuss-gnuradio] Frequency Hopping/ center frequency /time

[Hanno]

Brian Padalino schrieb:
> On Sun, Dec 13, 2009 at 4:05 PM, Hanno <address@hidden> wrote:
>   
> > Hi,
> >
> > what about calculating on the host? At the end I will have a signal at
> > ~25Mhz (baseband) which will be converted up by the usrp.
> > Is this really possible? It seems to me that this will be to high for the pc
> > to calculate.
> >
> > Am I right?
> >     
>
> It all depends on the bandwidth of the signal in question.
>
> Your first question made me think you had a smaller bandwidth signal
> jumping around a 25MHz bandwidth somewhat quickly.  Since the USRP2
> can handle 25MHz of bandwidth being sent to it, you can place your
> smaller bandwidth signal anywhere within that 25MHz as calculated at
> the host.
>
> Does that make sense?
>   

That's exactly the case this is all about ;)
It's a constant/sine which should hop within a band of 25Mhz.
So I will try to implement the hopping directly on the host without 
retuning.

Thx

>   
> > Seems like I have to shift work to the fpga.
> >     
>
> If you have a 25MHz bandwidth signal that you need to move around the
> spectrum, then yes - you will have to shift inside the FPGA or look
> into how quickly you can retune the front end.
>
> I hope this is a bit more clear.
>
> Brian
>
>