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

[Changkyu Seol]

Matt Ettus wrote:
> 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.

I tried as you suggested but it still drifts. I also added the following 
line in the firmware to make sure.

clocks_mimo_config(MC_WE_LOCK_TO_SMA);

I tried on several different USRP2s and I got same results.
Any more suggestions?
-- 
Posted via http://www.ruby-forum.com/.