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Gas turbine frame-V machine got tripped on low inter-valve pressure. Checked and observed transmitter 96FG2A, 2B, 2C reading fluctuating in negative side. Transmitter checked and found it is ok. It was observed that when we are using walkie talkie in GCV/SRV area, pressure hunting and coming dowmn negative. Pressure transmitter is work on 0-5 VDC signal. Please guide me how can overcome this problem to avoid GT trip on radio frequency.