Application Note #107: Measuring High Power RF Pulse Field Levels

This application note outlines and describes "Measuring High Power RF Pulse Field Levels".

Purpose -
The information supplied in this application note is to provide a better understanding of how measurements can be determined for high power pulse field levels. Although not for every case, customer’s specification, and/or requirement, these high power pulse field levels are largely defined and determined by or from the DO-160 standard. Many of these requirements are due to the increased applications of pulse modulation technologies that are being employed for communications and other high technology applications and are therefore being incorporated into commercial and military Radiated Susceptibility (RS) test standards. It is then a necessity to be able to test with common available lab equipment if you are performing testing at high power pulse field levels. This application note explains and illustrates how the field levels are determined. It also illustrates the relationship of amplifier power to antenna gain. (See our application note 105 “antenna terms and related formulas” for more detailed information.)

Introduction -
The DO-160 Standard requires two basic types of pulse modulations, SW or Square Wave Modulation and PM or Pulse Modulation. The purpose and function of this application note will be to describe and discuss the high power pulse field levels as required by many applications including category L of the DO-160 standard related to Pulse Modulation. Pulse modulation “PM” requires that the pre-calibrated carrier be modulated to 100% depth with an on-off ratio of 40 dB. The key issue with the...

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