An analog TV visual transmitter is tested by modulating it with a periodic test signal. The envelope of the transmitter output is viewed on an oscilloscope as shown in Fig. P8-46, where K is an unknown constant. The output of the transmitter is connected to a 50-? dummy load that has a calibrated average reading wattmeter. The wattmeter reads 6.9 kW. Find the PEP of the transmitter output.