Not sure about uhd_fft. I know that with rx_samples_to_file, it behaved fine until I added the timed commands. That's why I sent the source code attachment so that the problem could be easily duplicated. Rob
On Fri, Apr 19, 2019 at 1:15 PM Marcus D. Leech <patchvonbr...@gmail.com> wrote: > On 04/19/2019 09:44 AM, Rob Kossler wrote: > > I had started with a mid-January version of master and that's where I > noticed the issue. > > I am using: > > UHD_3.14.0.HEAD-0-gf6cacec8 > > With an X310, using a UBX-160 V1 > > I'm running with the default clock rate, and getting 25Msps, using a 10MHz > lo offset. I'm using uhd_fft to observe the spectrum at 950MHz. It's > exactly where > one would expect it to be, similarly at 2450MHz. > > > > > > On Thu, Apr 18, 2019 at 6:00 PM Marcus D. Leech <patchvonbr...@gmail.com> > wrote: > >> On 04/18/2019 05:09 PM, Rob Kossler wrote: >> >> OK, so what happens if you use a *positive* LO offset? >>> >> >> It moves in the opposite direction. A few remarks: >> >> - I should mention that the behavior I'm seeing with >> rx_samples_to_file is not identical to the behavior I'm seeing in my own >> custom app. In my app, I see unpredictable behavior. Nevertheless, I >> figured we could start with rx_samples_to_file which seems to be >> consistent >> (albeit wrong). >> - Although I haven't tried rx_samples_to_file with other devices or >> with Tx channels, I did see bad behavior with Tx channels and with the >> N310 >> device using my custom app >> - I have no idea if this behavior is recent or not because I haven't >> been looking at this kind of thing for a long time >> - I am using the latest off master: UHD_3.15.0.git-89-gf93c5227 >> >> >> Rob >> >> I will try to reproduce this in my lab in the morrow. In the mean-time, >> if you revert to earlier UHD, do you see the same thing? >> >> >> >
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