Changkyu Seol wrote:
Hi!
I am planning to implement multiple synchronized transmitters using
USRP2 and GPS receiver. Before that I checked whether the USRP2 is
locked to external clock through following experiment.
The easiest way to check for lock is to put the following line in your
firmware:
clocks_enable_test_clk(true,10);
This will output a test clock on the middle 2 pins of the 4 pin
connector right near the VCXO on the motherboard. Look at one of those
2 pins on an oscilloscope at the same time as the 10 MHz reference. You
should see the two clocks don't drift relative to each other.
Matt
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