Intentional emitters above 2400 MHz: how best to measure thetransmitted signal level for FCC Part 15 compliance

摘要

This paper investigates the commonly used methods for measurementof the intentional signal levels emitted by Part 15 radio frequency (RF)devices operating above 2400 MHz, and that have built-in antennas thatare soldered directly to a printed circuit (PC) board and are notnormally removable. In this paper, we look at what the FederalCommunication Commission (FCC) rules really require, and the extent ofthe possible errors involved in the different ways of measuring theintentional signal fundamental and harmonics. The reliability of themeasurements for preventing interference to licensed radio servicesmaybe improved by making radiated emission measurements wheneverpossible to compare the maximum field strengths to the FCCfield-strength limits; determine the transmitter output from the EIRP atthe higher frequencies; and, apply the FCC guidance on measurements fordirect sequence spread spectrum systems only to direct sequence spreadspectrum transmitters