Hi Chandu,
1) Remove 220pF capacitor.
2) Remove 2.2K resistor.
3) Connect the pulser output to the transducer using a 50Ohm well shielded cable.
4) Now observe the signal at input and output of the T/R switch.
5) You can also experiment putting in place of a 2.2K resistor, a 50-100Ohm resistor as the transducer is connected.
6) Show us oscillograms with the following signals: pulser p/n logic inputs and signals before and after T/R switch.
7) Use a glass filled with water. Touch the transducer to the water surface and observe the signals on your scope.
Good Luck,
Mariusz