Need to ensure that the phase shifter can still perform a phase shift ranging from 0 to 180 degrees in the 915 MHz ISM frequency band for a range of bias pin voltage values provided by the output of the amplifier and ranging from 0 to 15 V. We performed this test by supplying the phase shifter with a bias pin voltage ranging from 0 V to 15 V in steps of 0.1 V. The amplifier was supplied with a 15 V power, and the input voltage going into the amplifier ranged from 0 to 5 V in steps of 0.1 V such that the output of the amplifier ranged from 0 to 15 V in steps of 0.5 V. Therefore, the output of the amplifier supplied the voltage to the bias pin of the phase shifter. In order to observe which frequency resulted in the largest phase shift range, we tested each PCB at the following frequencies: 917 MHz, 920 MHz, 925 MHz, and 928 MHz. Once all the phase shifters were tested, we set our reference phase shifter to be the one with the greatest phase shift range.