[USRP-users] Gain Distribution for RFX900

Josh Blum josh at ettus.com
Wed Feb 13 03:22:45 EST 2013



On 02/12/2013 06:37 PM, Gonzalo Flores De La Parra wrote:
> Hi list..
> i work with USRPN210+WBX and RFX900, i read in a previous topic how the
> gain is distributed for the first case but i would like to know where can i
> check the way gain is distributed in other DB's or at least in the RFX900.

For reference:
"""
So when setting the overall RX gain, the gain is first distributed to
the RF frontend, then to the ADC. For TX, the gain is first distributed
to the DAC, then to the  RF frontend.
"""

This applies to all of the daughterboards. ,RFX though has no transmit
gain on the daughterboard:
http://files.ettus.com/uhd_docs/manual/html/dboards.html

Also, you can also use the API to set gain elements individually, in
case the automatic distribution is not desirable. Gain elements have
name like "PGA0", you can use this in the name field for the set_rx_gain
method.

> Also, to values of the gain range for the DB are always in dB? what power
> is that? how can measure it or calculate it?
> Thanks in advanced

The values are always in dB.

Its best to calibrate the absolute level with a test tone slightly off
the desired center frequency of interest.

-josh

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