Errors calibrating bladeRF x40

[wpats]

Hi,

I just purchased one of these devices and followed the instructions to generate a dc offset table. I ran into a couple of issues doing this. Every time I run the "cal lms" command in bladeRF-cli I get different values printed out for "LMS RX LPF modules...". For example in this the Q value looks suspicious:

Calibrating LMS RX LPF modules...
RX LPF I filter: 25
RX LPF Q filter: 1

On another run it gives:

Calibrating LMS RX LPF modules...
RX LPF I filter: 25
RX LPF Q filter: 33

Why does the Q value change so much with each run ?
The second issue happens when I run "cal table dc rx". I get the following error several times:

[WARNING @ lms.c:1887] vtune_norm_to_low: VCOCAP hit max value.avg: 1 )

What is causing this ? Is the hardware defective ?

I would appreciate any help.

--Patrick

[wpats]

Hi Jon,

Thanks for following up on this. Sorry, I haven't had the time to experiment with the bladeRF and post a recording of the samples. I am assuming that you no longer need that since you have a repro.

The RX LPF Q value is now varying less and it seems to have settled to low values like between 5 and 12. Could this be due to more use ? What is the root cause - I hope it is not a defect in some hardware component ?

I would be happy to confirm that your fix works when you publish it.

Thanks,

--Patrick