USRP Gain

GNU Radio
1

Is there any documentation on what the gain does for the USRP receive
and
transmit functions. Sometimes it seems like these values are
meaningless.

Also, I am noticing that when I begin to Rx data, there is often a huge
amplitude spike within the first 2k samples I Rx. Is this normal?

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2

On Wed, Jul 23, 2008 at 07:45:57AM -0700, isaacgerg wrote:

Is there any documentation on what the gain does for the USRP receive and
transmit functions. Sometimes it seems like these values are meaningless.

Sometimes they are fixed. Have you queried the valid ranges for the
daughterboards you are using using bdev.gain_range()…

Outside of the Basic Tx and LF Tx, none of the d’boards have
adjustable transmit gain.

Also, I am noticing that when I begin to Rx data, there is often a huge
amplitude spike within the first 2k samples I Rx. Is this normal?

There’s a known problem in the first ~1K rx samples when the USRP is
first enabled.

Eric