Question

The voltage measured by a certain antenna is 5V for every V/m of the incident electric field at 100 MHz. What voltage (dBìV) at the antenna terminals corresponds to the FCC Class B limit at 100 MHz? At this antenna voltage, what voltage is measured by a spectrum analyzer when connected to the antenna by 200 ft of coaxial cable with 4.5 dB/100 ft of loss at 100 MHz.

[Answer: 57.48 dBìV, 48.48 dBìV]

Answer 1