Thanks Marcus.I find that it is easier to choose target RF at which DSP freq
is zero, then avoid DC in data allocation in baseband.
Anyway, what do "lowest offset" and "corrected " mean in the calibration file?
some example lines as below. I am uinsg step size 1MHz.TX DC: 1020.000000 MHz:
lowest offset -92.824059 dB, corrected 35.168568 dBTX DC: 1021.001221 MHz:
lowest offset -90.716408 dB, corrected 32.376762 dBTX DC: 1022.002442 MHz:
lowest offset -91.902306 dB, corrected 34.561279 dB
Kind regards,Hongwei
On Monday, 7 August 2023 at 14:46:35 BST, Marcus D. Leech
<patchvonbr...@gmail.com> wrote:
On 07/08/2023 09:41, zhou via USRP-users wrote:
Thanks for your quick response, Marcus.
On the 2nd question, I mean, when LO is different from the target RF freq,
DSP will make up the difference. LO leak will become a spurious signal at DSP
freq. Can this LO leak be compensated in USRP? if yes, how?
If you move the LO leakage out of the passband of your application sample
rate, it won't be bothersome.
Thanks.
On Monday, 7 August 2023 at 14:11:08 BST, Marcus D. Leech
<patchvonbr...@gmail.com> wrote:
On 07/08/2023 04:40, zhou via USRP-users wrote:
Hi,
I have a question regarding USRP calibration. I am using X310 and UHD 4.4. To
save calibration time, the step size is set to be 5MHz and the freq range is
[600MHz, 6GHz]. My questions are: 1. will the compensation be made at these
discrete frequencies only, or interpolation will be applied to frequencies
which are between the steps? Interpolation is applied.
2. how to compensate DC offset in case there is DSP freq?
The DC offset compensation is applied based on the *analog* frequency setting
of the RF PLL. The DSP component
is "perfect" from a offset and balance perspective.
Thanks, Hongwei
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