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

[Douglas Geiger]

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Matt Ettus wrote:
>>
>>  Ah - that's was the problem. Unfortunately my scope can only handle a
>> single channel at 100MHz, so setting the divisor >2 helps.
>>  Unfortunately it appears the clock is not synchronized with my external
>> 10MHz clock - any suggestions on further steps to debug why I'm having
>> trouble?
> 
> 
> I don't understand this.  It works 100% of the time here.  What code are
> you using?
> 
> Matt

I'm at svn revision 10441 - with both the firmware and fpga code built
from that (using Xilinx ISE 10.1 to make the fpga). I've just modified
the txrx.c code - adding:
clocks_enable_test_clk(true, 2);
clocks_mimo_config(MC_WE_LOCK_TO_SMA);
just before the while(1) loop

My rx_mimo.cc code also calls ->config_mimo(MC_WE_LOCK_TO_SMA), but
right now I've stepped back to just getting one USRP2 synchronized to my
external source - which in this case is a function generator with a
10MHz sine with 2V P-P.

Is it possible some of the hardware on my USRP2's isn't working?

Thanks,
 Doug

- --
Doug Geiger
Research Assistant
Communications and Signal Processing Lab
Oklahoma State University
http://cspl.okstate.edu
address@hidden
address@hidden
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