Email Document Reference

Enter your email address below and the reference for this document will be sent to shortly from webmaster@ceesi.com.

Title: Spread Spectrum Systems For Efm And Scada
Author: Bill Frachiseur
Source: 2006 International School of Hydrocarbon Measurement
Year Published: 2006
Abstract: In 1985, the FCC (Federal Communications Commission) allocated three frequency bands for a radio transmission technique known as spread spectrum communications, originally developed by the military. This transmission technique has much greater immunity to interference and noise compared to conventional radio transmission techniques. This is accomplished by the radio changing channels many times per second and each time it changes channels it sends a packet of data. In addition, an increasing number of users can use the same frequency (similar to cellular). Under the regulations, users of FCC certified spread spectrum products do not require a license from the FCC. The only requirement is that the manufacturers of Spread Spectrum products must meet FCC spread spectrum regulations. One of these requirements is that the maximum output power be 4 watts at the antenna. This reduces the range to 25-30 miles with line of site. These rules are designed to drive usage towards local data communications.

In order to prevent spam and automated file downloads for documents within the Measurement Library, please follow the instructions below and then you will be able to email a reference to this article.