[USRP-users] Using GPSDO with gps lock

Marcus D. Leech patchvonbraun at gmail.com
Sun Feb 24 00:03:32 EST 2019

On 02/23/2019 11:33 PM, Jason Roehm wrote:
>> On Feb 23, 2019, at 5:41 PM, Marcus D. Leech via USRP-users <usrp-users at lists.ettus.com> wrote:
>>> 3)   I believe I read somewhere that the GPSDO uses the same 10MHz lines as the REF in.  What happens if I have a 10Mhz source hooked up while the gpsdo module is installed when I do not have a gps lock?  What would happen if a 10Mhz input was hooked up while I did have a gps lock?
>> There are electrical cross-talk issues between the GPSDO's 10MHz line and the external reference line.  So, if you plan to use an external
>>   reference, you should remove the GPSDO module from the board.
> Wow, it looks like you buried the lede there; that could be an issue for a design I was planning. Is this documented anywhere? Failing that, do you have any additional details on the issue?
> Thanks.
> Jason
It is documented here:


More information about the USRP-users mailing list