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 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 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 3.11.1.0 to UHD 3.12.0.
Here are the spectrum analyzer plots at roughly the same power
level. The 3rd order two tone IMD level changes from almost -50
dB in 3.11.0.1 to a hideous -20 dB with 3.12.0. Something is
terribly wrong.
I know that there had been some "futzing" with scaling in the B2xx
at around that time. What about 3.13 or 3.14?
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