Ian,
Thanks for the insight! The changes for the RFNoC blocks are correct, but
the DSP cores (rx_dsp_core_3000 and tx_dsp_core_3000) that use the CORDIC
should not have been changed. It looks like the fix might be as simple as
backing out the changes to rx_dsp_core_3000.cpp and tx_dsp_core_3000.
I think look to commit d588005fd87dd2594adb29dbbdcf948bbb0ab0c1 and files
uhd/host/lib/usrp/cores/tx_dsp_core_3000.cpp and
uhd/host/lib/usrp/cores/rx_dsp_core_3000.cpp
CORDIC compensation gain was mistakenly eliminated in UHD for all 3rd
generation USRP’s rather than just the ones that switche
Gnu Radio flow graph attached.
Ron
On 09/12/2018 12:43 AM, Cedric Roux wrote:
Dear Ron,
On 09/11/18 08:49, Ron Economos via USRP-users wrote:
I've done more testing. Here are some plots with the spectrum
analyzer in zero span and a real sawtooth wave being transmitted.
I would like to try t
Dear Ron,
On 09/11/18 08:49, Ron Economos via USRP-users wrote:
I've done more testing. Here are some plots with the spectrum analyzer
in zero span and a real sawtooth wave being transmitted.
I would like to try this in our lab. Is it possible for
you to share your code to generate the sawtoot
Hi Ron,
Thank you for bringing this to our attention and for all the detailed
reports on the issue. We will need to look into it. Is it possible for
you to continue using UHD 3.11.1.0 while we look into the issue?
Regards,
Michael
On Mon, Sep 10, 2018 at 11:49 PM, Ron Economos via USRP-users <
I've done more testing. Here are some plots with the spectrum analyzer
in zero span and a real sawtooth wave being transmitted.
The first plot is with 3.11.1.0 and sawtooth amplitude = 1.0. /Perfectly
linear./ This also shows that it's entirely possible to have baseband
amplitudes approaching
On 09/10/2018 10:48 PM, Ron Economos via USRP-users wrote:
It seems like it was correct before and wrong now. It's always been
said that baseband levels must be restricted to -1.0 to 1.0. Now it's
something different?
I consider this issue to be the same as a patch to the Linux kernel
that br
It seems like it was correct before and wrong now. It's always been said
that baseband levels must be restricted to -1.0 to 1.0. Now it's
something different?
I consider this issue to be the same as a patch to the Linux kernel that
breaks user space. And you know how Linus feels about that.
On 09/10/2018 10:21 PM, Ron Economos via USRP-users wrote:
I have to reduce the baseband amplitude from 0.96 to 0.67 to achieve
the same IMD.
This is a very annoying issue for me, especially since I've set levels
in the Gnu Radio gr-dtv example flow graphs based on previous behavior.
Ron
I have to reduce the baseband amplitude from 0.96 to 0.67 to achieve the
same IMD.
This is a very annoying issue for me, especially since I've set levels
in the Gnu Radio gr-dtv example flow graphs based on previous behavior.
Ron
On 09/10/2018 05:37 PM, Marcus D. Leech via USRP-users wrote:
On 09/10/2018 08:34 PM, Ron Economos via USRP-users wrote:
I'll try that. It's going to take a while though since I have to rebuild.
Ron
Understood. Sorry for the PITA
On 09/10/2018 05:30 PM, Marcus D. Leech via USRP-users wrote:
On 09/10/2018 08:27 PM, Ron Economos via USRP-users wro
I'll try that. It's going to take a while though since I have to rebuild.
Ron
On 09/10/2018 05:30 PM, Marcus D. Leech via USRP-users wrote:
On 09/10/2018 08:27 PM, Ron Economos via USRP-users wrote:
No change with 3.13.0. Haven't tried 3.14, since it's not released yet.
Ron
Is this effect
On 09/10/2018 08:27 PM, Ron Economos via USRP-users wrote:
No change with 3.13.0. Haven't tried 3.14, since it's not released yet.
Ron
Is this effect independent of baseband magnitude?
On 09/10/2018 05:21 PM, Marcus D. Leech via USRP-users wrote:
On 09/10/2018 08:17 PM, Ron Economos via U
No change with 3.13.0. Haven't tried 3.14, since it's not released yet.
Ron
On 09/10/2018 05:21 PM, Marcus D. Leech via USRP-users wrote:
On 09/10/2018 08:17 PM, Ron Economos via USRP-users wrote:
I had previously noted that the B210 TX power had increased by about
5 dB going from UHD 3.11.1
On 09/10/2018 08:17 PM, Ron Economos via USRP-users wrote:
I had previously noted that the B210 TX power had increased by about 5
dB going from UHD 3.11.1.0 to UHD 3.12.0. Today, I was doing some two
tone IMD testing and noticed that the IMD performance has degraded
*severely* from UHD 3.11.1
I had previously noted that the B210 TX power had increased by about 5
dB going from UHD 3.11.1.0 to UHD 3.12.0. Today, I was doing some two
tone IMD testing and noticed that the IMD performance has degraded
*severely* from UHD 3.11.1.0 to UHD 3.12.0.
Here are the spectrum analyzer plots at ro
16 matches
Mail list logo
