[USRP-users] Info about GPSDO for N2XX and E100 series signals

Mike Jameson mike at scanoo.com
Tue Apr 9 09:55:01 EDT 2013

Hi Mike,

The 1PPS signal is used to latch a time into the USRP device. The 1PPS
signal is not required to utilise the 10MHz reference clock accuracy and is
only used to set an exact start time as such.

See here for more info:




Mike Jameson M0MIK BSc
Email: mike at scanoo.com
Web: http://scanoo.com

On 9 April 2013 14:29, <mscott at northernradar.com> wrote:

> **
> Hi I have some questions about the GPSDO module.
> I'm not exactly familiar with GPS timing so please bear with me if some of
> these questions seem like common sense.
> The PPS output signal.  I understand this is a signal that helps the
> accuracy of the 10 MHz clock.  Could somebody please provide some input
> about what exactly is going on in the receiver when it receives this
> signal?  Frequency, etc?
> The RS232 signal?  Is this just so that software like gnuradio
> automatically detects this feature broadcasted through the receiver to the
> computer?  Or if you set the jumpers correctly and have your 10 MHz signal
> and PPS signal connected correctly without the RS232 connection.  Will
> everything run fine?
> If anyone would care to answer and needs anymore info or I haven't
> elaborated enough please do not hesitate to ask me to elaborate.
> Thank you,
> Mike Scott
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