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From: | Matt Ettus |
Subject: | Re: [Discuss-gnuradio] USRP2 and external clock (from GPS receiver) |
Date: | Wed, 18 Feb 2009 09:17:29 -0800 |
User-agent: | Thunderbird 2.0.0.19 (X11/20090105) |
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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