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[Discuss-gnuradio] 25 MHz of instantaneous RF bandwidth on USRP2
From: |
Feng Andrew Ge |
Subject: |
[Discuss-gnuradio] 25 MHz of instantaneous RF bandwidth on USRP2 |
Date: |
Sun, 14 Sep 2008 21:07:07 -0400 |
Eric,
I am just wondering whether this piece of code exists somewhere or not
to enable
>
> 100MS/s I & Q is decimated to 25MS/s complex. We use 16-bit I & Q.
> That works out to ~800Mbit/s on the gigabit ethernet, which the USRP2
> can sustain, no problem.
If so, would you please kindly point out?
Thanks,
Andrew
On Fri, 2008-09-12 at 16:37 -0400, address@hidden
wrote:
> On Fri, Sep 12, 2008 at 01:54:08PM -0500, Douglas Geiger wrote:
> > Very exciting!
> >
> > One technical question:
> > By 25 MHz of instantaneous RF bandwidth - do you mean the
> 100Msamples/s
> > from the ADC gets decimated down to 50Msamples/s? In which case, is
> the
> > Gig-E able to handle that much sustained throughput (I'm guessing
> that's
> > with 8-bit samples?).
>
> 100MS/s I & Q is decimated to 25MS/s complex. We use 16-bit I & Q.
> That works out to ~800Mbit/s on the gigabit ethernet, which the USRP2
> can sustain, no problem.
>
> > Also, does the locking of the clocks of multiple USRP2's work like
> the
> > USRP, e.g. where I can set one as the master and the other as slave
> - i.e.
> > is the MIMO cable you refer to a coax SMA-SMA cable to connect the
> clock
> > in/out connect (which have to be soldered in place) and the 2-wire
> cable to
> > the daughterboard (like described on
> > http://gnuradio.org/trac/wiki/MultiUsrp)?
>
> No soldering required. The mimo cable is a serial attached scsi cable
> repurposed for our needs. The host configures the clocking on the
> USRP2s over the ethernet.
>
> Here are the clocking options:
>
> USRP uses it's own free running xtal oscillator
> USRP uses the external reference input (SMA connector)
> USRP uses the clock provided over the MIMO cable.
>
> In addition, the master is programmed to drive clock onto the
> MIMO cable.
>
> Eric
>
--
- [Discuss-gnuradio] 25 MHz of instantaneous RF bandwidth on USRP2,
Feng Andrew Ge <=