It passes the pps test.
I just thought it is not working properly because the clock is too fast (5x
than pps), and reading time is less than 1 sec.
If that is normal, then my GPS pps signal may be working correctly
- Sangho
---------------------------------------------------------------------
Creating the usrp device with: ...
Current recv sock buff size: 50000000 bytes
Using Device: Single USRP:
Device: USRP2/N Series device
Mboard: USRP2-REV3 mboard
RX DSP: USRP2-REV3 ddc0
RX Channel: 0
RX Dboard: USRP2-REV3 dboard (rx unit)
RX Subdev: XCVR2450 (0x0061)
TX DSP: USRP2-REV3 duc0
TX Channel: 0
TX Dboard: USRP2-REV3 dboard (tx unit)
TX Subdev: XCVR2450 (0x0060)
Set time to known value (100.0) without regard to pps:
Reading time 1 second later: 101.000101
Set time to known value (0.0) at next pps:
Reading time 1 second later: 0.871597
Success!
On Tue, Jan 18, 2011 at 8:45 PM, Josh Blum <j...@ettus.com> wrote:
> Using a 5Hz PPS is not fundamentally different than 1Hz. That should not
> be a problem.
>
> Make sure your pulse has the correct levels:
> http://www.ettus.com/uhd_docs/manual/html/usrp2.html#pps-pulse-per-second
>
> -Josh
>
> On 01/18/2011 05:36 PM, Sangho Oh wrote:
> > Hello,
> >
> > I am using Garmin 18 5Hz PPS clock for USRP synchronization.
> >
> > This is the GPS: https://buy.garmin.com/shop/shop.do?pID=8631
> >
> > However, because it is 5Hz PPS not 1Hz, the synchronization looks not
> > working properly.
> >
> > I got following message on the time stamp reading after 1 sec.
> >
> > "Creating the usrp device with: ...
> > Current recv sock buff size: 50000000 bytes
> > Synched to PPS: Reading time 1s later: 0.829645"
> >
> > As you see, the time reading after 1 sec is smaller than 1 sec.
> >
> > I am wondering if I have to buy another GPS for 1 Hz PPS.
> >
> > Thanks.
> >
> > - Sangho
> >
> >
> >
> >
> > _______________________________________________
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> > Discuss-gnuradio@gnu.org
> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
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--
*From: Sangho Oh
*
*Voice mail: (609) 759-1552*
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