On 06/14/2018 06:28 PM, Keith k wrote:
I was testing on 3.11.0, but im back on maint and it looks like the
code is the same.
Thanks.
On Thu, Jun 14, 2018 at 9:39 PM, Marcus D. Leech <mle...@ripnet.com
<mailto:mle...@ripnet.com>> wrote:
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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-Keith Kotyk
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