UHD - USRP block - sample rate

Hello,

I’m trying to transmit a signal using the UHD-USRP sink block in a flow
graph.
I found that the sample rate that must be used in this block is
determined
by the (samples/symbol ) x (symbol rate).

In my case, I am transmitting 16 samples/symbol and a symbol rate of 125
ksymbols/seg which is equal to a sample rate of 2 Msamples/s. Is this
right? is this the sample rate that I have to set at the UHD-USRP block?

And I use this same sample rate in the UHD-USRP source block too?

The center frequency of the UHD-USRP block was set at 2.4 GHz. This
parameter affects the sample rate?
I am working with a daughter board RFX 2400 and USRP1.

Thanks a lot. I really need to solve this problem!

Javier M.