LED E is always on, even when I disconnect the external source I used this command on the Tx: uhd.tune_request(915000000)
and this command on the Rx: uhd.tune_request(915000000,10e6) the freq is now very stable but there is a constant shift of 570 Hz between Rx and Tx another strange thing happened: when I used the command uhd.tune_request(915000000,10e6) on the Tx, the USRP transmitted with a shift of 10 MHz (minus a few 100s Hertz) is this ok? what can I do to solve the constant shift of 570Hz what is the uhd.tune_request command and how can I use it when configured to external clock? Thanks, Guy On Mon, Jun 3, 2013 at 3:39 PM, Marcus D. Leech <mle...@ripnet.com> wrote: > I Checked the levels with the clock connected to the USRP ( and without) >> The levels are fine ( about 600 mV rms on the scope) >> additionally, I disconnected it from the load (USRP) to see if the level >> changed. and they did (proving the cables are connected to a load). >> >> the problem remains, >> is there a command that could check if the USRP is locked to the external >> clock? >> what is the best way to debug this and to find the root cause? >> >> Thanks for your help, >> Guy >> >> >> You can use "test_pps_input" which is one of the UHD examples. > > Also, LED 'E' tells you whether the clock is locked to the external > reference. > > > > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > >
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