On 06/14/2018 04:57 PM, Keith k wrote:
Hey Marcus
Okay, we looked into this and realized that the rx_samples_to_file
program has a bug. When you set the channel, it doesnt tune the center
frequency of the desired channel which is why the amplitudes are off.
Anything other than the first channel is at DC. Finding this bug led
me to a similar issue in my code which let me resolve my problem.
Thanks. Is this list the place to report bugs? Thanks.
Yes, thanks.
What version of UHD?
Just so it doesn't get "already fixed".
On Thu, Jun 14, 2018 at 5:45 PM, Marcus D. Leech via USRP-users
<usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> wrote:
On 06/14/2018 01:30 PM, Keith k via USRP-users wrote:
Hello all
I noticed in my testing that I am seeing significant mismatch
in amplitude on each channel of my N200(lfrx db) with the
second channel being much weaker. I thought that it was a
problem with my code, but when I hook up a signal generator
and split to both RX ports and use the rx_samples_to_file
example, I still see a clear difference as shown in the quick
plot.
./rx_samples_to_file --args="addr0=192.168.10.112"
--file="samples.dat" --type="float" --duration 1 --rate 5e6
--freq 13e6 --subdev="A:A A:B" --channel 0 --ref="external"
./rx_samples_to_file --args="addr0=192.168.10.112"
--file="samples2.dat" --type="float" --duration 1 --rate 5e6
--freq 13e6 --subdev="A:A A:B" --channel 1 --ref="external"
However my colleague has his own set of gnuradio code, and
when he ran his example it produced a plot of similar
amplitude. I can't see much of what I'm doing different using
C++ UHD vs his gnuradio code, but I'm not a big expert here so
I'm just looking for ideas. Thanks.
UHD version UHD_3.11.0.HEAD-0-g13c32cef
What subdev spec is your friend using in his flow-graph? Is it
.GRC derived, can it be posted here?
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