Re: [Discuss-gnuradio] USRP2 External Clock

[Matt Ettus]

Actually, you can use 100 MHz as well, you will just need to change one 
line of the firmware to set the R-divider on the PLL.

You can use any frequency for which the following equation has a solution:


   100 MHz / N = Ref / R

for which N and R are integers and smaller than 32K

Matt


Kyle Pearson wrote:
> I'm aware that the internal clock can be locked to an external 10MHz
> reference. I take it that there is no way to use an external 100MHz
> clock instead of the internal clock then.
>
> -Kyle
>
> On Wed, Oct 22, 2008 at 4:17 PM, Eric Blossom <address@hidden> wrote:
>   
> > On Wed, Oct 22, 2008 at 04:12:07PM -0400, Kyle Pearson wrote:
> >     
> > > I'm wondering if it is possible to connect the USRP2 to an external
> > > 100MHz clock like the USRP was able to be modified so it could connect
> > > to an external 64MHz clock. I don't see any place to solder on a SMA
> > > connector but there are a set of pins labeled Test CLK. Could that be
> > > used for inputting an external clock or is it just for testing the
> > > clock output?
> > >
> > > Thanks,
> > > Kyle
> > >       
> > Note the "Ref Clock" connector on front panel:
> >
> >  http://gnuradio.org/trac/wiki/USRP2
> >
> > It takes a 10 MHz reference.
> >
> > Eric
> >
> >     
>
>
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