Just for my own edification, what is the exact role of the signal that is put into the LO IN RX port? And why does it need to be exactly twice the desired receive frequency? Wouldn't there be additional resolution for any frequency greater than twice the desired receive frequency?
On Thu, Nov 19, 2020 at 1:11 PM Christopher Flood < christopher.fl...@colorado.edu> wrote: > Yes, the signal should be at +3dBm, the Vrms is ~300mV into a 50 ohm load. > The frequency of the signal is also twice the frequency of the signal I'm > trying to gather data on. However, due to the way the documentation is > phrased, I wasn't sure if 20MHz is too low of a frequency for the LO RX IN. > > I have not tried the init_cals=basic argument. I can give that a shot and > report back. > > -Chris > > On Thu, Nov 19, 2020, 12:32 PM Marcus D Leech <patchvonbr...@gmail.com> > wrote: > >> Are you inputting an LO signal at twice the desired frequency and at >> +3dBm? >> >> Have you tried adding init_cals=BASIC to your device ages? >> >> Sent from my iPhone >> >> > On Nov 19, 2020, at 2:26 PM, Christopher Flood via USRP-users < >> usrp-users@lists.ettus.com> wrote: >> > >> > >> > Hi all, >> > >> > I've seen some discussion about this on the email lists, but I'm still >> having a bit of trouble. I'm trying to use the LO IN RX ports on the front >> of the N310 to synchronize the oscillators on the two daughterboards. I was >> thinking I could generate a signal on one of the TX/RX ports of the SDR and >> feed that into the LO IN RX ports at the appropriate frequency and power. >> However, when I test this setup in GNU Radio Companion I don't get any >> meaningful data, so I must be doing something wrong. >> > >> > The input signal that I want to sample is a 10MHz signal that is going >> into an RX2 port on the front end of the SDR. When I set the device >> argument "rx_lo_source=internal" and run it, the data I get looks exactly >> how I would expect. When I change the device argument to >> "rx_lo_source=external" and run it, I don't get anything that makes sense. >> > >> > Am I using the LO IN RX ports correctly? The documentation doesn't say >> much besides power and frequency ranges. >> > >> > Any help or advice would be much appreciated. >> > >> > -Chris >> > _______________________________________________ >> > USRP-users mailing list >> > USRP-users@lists.ettus.com >> > >> http://secure-web.cisco.com/1rpFFtn1JZDE_g214Q-YS6vXmf7iX-GrSqz5_gIRlzT74BRG0LQVcDxlbCKOBLjxI7GcMNxycsBFMF-Lzacu4VXZpGTxpMgLHyxfkdQ2pzOtNNtecm_gMTYICiRaahesVZWF5a2dj7cjYzaLEjuC4PUBV2IKiJN9B3Z0EGCGPr6nbTyCm-I7dJfEsfYsSIFdFFSQP6iWj2NrE4xYBVKyPCxJT34HfnXS_KoENsd6WDKRct0TsItd4_dk4xBZEWrwNqes0pfV_RJzJFNSWC1tJjpFk1UVK8ySaM22YoapPkrKhJ7xvd9EiKc-aK5WHC2syeWL5YAO5QNCrMxT9JJ-i3tvC2sZAlgAyNSx78qV7M09bkZ1k2hn5qi3jbvK3xggz-HHgjahAsx6zRH86NZDIoSe5_4tc6c0UeE03mYMgALuwY1kwoZr7b8-EjaFkvZRoF8mCGzGXTKfyvJuFHID1yA/http%3A%2F%2Flists.ettus.com%2Fmailman%2Flistinfo%2Fusrp-users_lists.ettus.com >> >>
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