Yup, that's some good advice. Here's a B210 with the TX gain set to 60.
The first plot is with the peak IQ levels around +/- 0.62. The second
plot is with the peak IQ levels around +/- 0.83. The LO leakage stays
the same, but you get a few dB more signal.
I have a little utility block that prints peak IQ levels. You would just
attach it to the output of the block connected to the UHD sink.
https://github.com/drmpeg/gr-iqlevels
The output looks like this:
peak real = +6.209883e-01, -6.199704e-01, 0, 0
peak imag = +6.208171e-01, -6.222230e-01, 0, 0
It prints the peak positive, peak negative and the number of times each
went over 1.0.
0.62 level
0.83 level
Ron
On 11/7/24 21:40, Marcus D. Leech wrote:
On 07/11/2024 22:23, Brais Ares Fernández wrote:
Nice, thank you for the tips. I understand it better now.
I forgot to mention the specific daughterboard. It's a CBX.
Should I expect a noticeable difference in behavior from an SBX or
even a B210?
Regards.
THe mixers involved will all have different LO leakage specs.
The other thing you didn't mention was what the baseband magnitudes
are. The LO leakage will generally be fixed,
for a given LO input power level, but the "free variable" here can
be the baseband magnitude. If you bump it up a bit,
but not at levels where anything exceeds about 0.85-0.9, the actual
output carrier will be stronger relative to
the LO leakage.
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