|Subject:||Re: [Discuss-gnuradio] 1 PPS input for USRP2|
|Date:||Fri, 12 Sep 2008 14:14:41 -0700|
|User-agent:||Thunderbird 220.127.116.11 (X11/20080723)|
subodh chiwate wrote:
Hi,I just saw the specifications for USRP2. I wanted to know the use of the 1 PPS and 10 MHz inputs. These are standard outputs of a GPS unit. So is it just a set of external references or they are used in the ethernet time stamping?
The USRP2 has a 100 MHz clock internally. That clock will be locked to the 10 MHz reference you provide.
Samples can be time stamped, and that time can be calibrated to the 1 PPS signal. In the most general case, that 1 PPS input just goes directly to the FPGA, so internally you can do whatever you want with it.
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