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From: | Changkyu Seol |
Subject: | [Discuss-gnuradio] Re: USRP2 and external clock (from GPS receiver) |
Date: | Thu, 19 Feb 2009 13:55:42 +0100 |
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/.
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