How to generate periodic pulses in limesdr mini?

Hi, I am using limesdr mini with gnuradio 3.7.11. So i have to generate pulses using the parameters like pulse width, PRI, frequency and amplitude of the signal source. I built the flow graph and I tested this using the signal analyser fsv but I got the wrong peak value. I generated pulses using vector source for periodic pulses and multiply this with a constant signal from a signal source of amplitude 1 and transmit it through the limesuite sink. can anyone address me whether my flowgraph is fine for this purpose or anything to do make it work?