On 04/19/2019 02:37 PM, Rob Kossler wrote:
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
Doh! Sorry. I got distracted by the (clearly-worrying) "tuned
frequency appears bad when using offset tuning", without also
considering the
timed-command aspect.
On Fri, Apr 19, 2019 at 1:15 PM Marcus D. Leech
<patchvonbr...@gmail.com <mailto: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 <mailto: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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