Different signals from TX_a TX_b Basic TX

Hello Everyone.

I’m using a USRP 1 with Basic TX daughterboard. It kind possible to have
on TX_a connector a baseband signal (10hz sine from gnuradio) and on
TX_b a sine wave at 10Mhz optained by sending a constant to the usrp and
then using the build in modulator?

Thanks!