[USRP-users] E100 external reference and PPS

Nick Foster nick at ettus.com
Tue Jun 19 14:33:48 EDT 2012


On Tue, Jun 19, 2012 at 11:26 AM, Nowlan, Sean
<Sean.Nowlan at gtri.gatech.edu>wrote:

>  Hi, ****
>
> ** **
>
> It has been 3 weeks and nobody has responded to this question. Is there
> anything special I need to do to enable the external reference and PPS
> inputs on the E100 (rev. 3)? My only thoughts are that 1) there’s something
> magic I have to do to get the E100 in the mood to use the external
> reference, or 2) the GPSDO unit I’m using is broken and the E100 can’t lock
> to it.
>

For 10MHz ref, set J15 across pins 2&3, and use
the set_clock_source(“external”, 0) command. How are you verifying lock?


> ****
>
> ** **
>
> Since the E100 (rev. 3) isn’t configured to automatically detect the
> Jackson Labs GPSDO and read its RS-232 output, I used Pin 3 to confirm that
> the GPSDO is locked.
>

Did you obtain the Jackson Labs GPSDO from Ettus or from Jackson Labs?

--n


> ****
>
> ** **
>
> Any thoughts? Also, if Ettus has the rev. 3 schematic available somewhere,
> that would be very helpful. Thank you!****
>
> ** **
>
> Best regards,****
>
> Sean Nowlan****
>
> ** **
>
> *From:* usrp-users-bounces at lists.ettus.com [mailto:
> usrp-users-bounces at lists.ettus.com] *On Behalf Of *Nowlan, Sean
> *Sent:* Friday, May 25, 2012 6:12 PM
> *To:* USRP-users at lists.ettus.com
> *Subject:* [USRP-users] E100 external reference and PPS****
>
> ** **
>
> Hi all,****
>
> ** **
>
> I have an E100 (rev 3) and I would like to use an external reference and
> PPS. I soldered straight SMA connectors onto J10 and J13 (REF IN and PPS
> IN, respectively). I’m supplying a 10MHz and PPS reference to the board,
> but I’m not sure how to tell the clock gen circuit to use the external
> reference.****
>
> ** **
>
> I tried set_clock_source(“external”, 0) but the reference won’t lock. Do I
> need to burn an EEPROM setting as with the N2xx? Is there a jumper I need
> to change?****
>
> ** **
>
> FYI I installed UHD 3.4.2 release.****
>
> ** **
>
> Thanks,****
>
> Sean****
>
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> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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