[Discuss-gnuradio] RX Gain (UHD vs libusrp2)

[Gaetano Mendola]

Hi all,
I'm in the process to migrate our software currently using the old
libusrp2 to use the UHD.
My daughter board of reference is the WBX.
With the libusrp2 the gain range was [0, 31.5] while with UHD is [0, 38].
I have noticed that now with UHD is possible to set (apart the overall
gain chain) the gain for the following elements:

WBX-PGA0  with a range [0.0, 31.5]
ADC-digital   with a range [0.0, 6.0]
ADC-digital-fine  with a range [0.0, 0.5]

this means that using the libusrp2 those two ADC gains were set to 6.0
and 0.5 giving then the user the ability
to change only the WBX-PGA0?

Even setting ADC-digital = 6.0, ADC-digital-fine = 0.5 and setting the
WBX-PGA0 to same value used with libusrp2
the result is not the same as in I'm losing something like 20 dB.
Is this expected ?

Regards
Gaetano Mendola


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