Problem using AD9361 TX block in Simulink

I am using AD9361 RF blockset to simulate my FHSS code in matlab.I am unable to modulate my base band signal to Radio wave frequency(in GHz) signal using the AD9361 TX block.
The input signal is not being mixed with Local Oscillator frequency and when i check the output of TX using spectrum analyser its showing the same base band signal given in the input.
I have tried changing the filter settings of the AD9361 Tx still there is no improvement in the output.
I need help and advice to understand and solve the problem.