Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver)

[Matt Ettus]

Douglas Geiger wrote:
> Is the test clock supposed to be running at 5kHz? I've just tested this
> on one of my USRP2 - it does appear to be locked with my external clock
> - - i.e. the 5kHz signal on the pin doesn't drift w.r.t my 10Mhz external


No, the test clock runs as 100MHz/div where div is the 2nd argument to 
the function.  The maximum value of div is 32.

I think you are using a digital oscilloscope to view this, and you are 
seeing it alias because you turned the time per division up way too 
high.  Change it to 100ns per division.

Matt