FM Antenna and Combiner Systems for FM HD Radio PDF
Preview FM Antenna and Combiner Systems for FM HD Radio
Broadcast Technical Symposium Design, Fabrication, Assembly, and Test of Broadcast Transmission Systems July 4, 2007 Thomas B. Silliman, P.E. Kinsley D. Jones Electronics Research, Inc. © 2007 Electronics Research, Inc. All rights reserved. ERI Product Range • FM Antennas • FM Filters and Combiners • Towers and Lambda Sections • Television Antennas • Transmission Lines • Television Filters, Combiners & Components • Structural Services & Products ERI History and Facilities • Founded in 1943 in Evansville, Indiana USA • Purchased by Broadcast Consultant Robert Silliman in the late 1950’s • In the 1960’s introduced new products for the emerging FM radio station market: – P-300 Vertically Polarized FM Antenna – 1105 Dual Cycloid Circularly Polarized FM Antenna • In the 1970’s introduced the ROTOTILLER® FM Antenna • In 1990 began building and installing Broadcast Towers • In 2003 acquired Andrew Corporation’s Broadcast Products Business Unit ERI Corporate Facts • Two Operating • Three Physical Divisions Locations – RF – Two Manufacturing – Structural – One Far Field Test Site • One Subsidiary – ERI Installations ERI’s Antenna Test Range • 70-acre full scale test range. • Two turntables and one static stand. • Ten full time employees. • Independent machine shop and model fabrication facility. ERI Gray Maine • Gray, (Portland) Maine. • 25,000 square feet in one building • Founded in 1986 • 40+ Employees • VHF & UHF filter, combiner, and RF component accessory engineering and manufacturing Broadcast Technical Symposium FM Antennas Side Mounted FM Antennas • Generally consist of one or more radiating elements that are stacked at one wavelength intervals to provide the gain desired. • There are many variations of element geometry • They are the most popular because they represent the most cost effective approach for single station applications. Panel FM Antennas • Normally selected for multiple channel (master FM antenna) systems (88 to 108 MHz) • They can be configured as omnidirectional or directional antenna systems • Can be mounted on an existing tower or supplied with its own top mounted support spine • Systems can be configured to handle as much as 250 kW of combined power ERI ROTOTILLER® FM Antennas • Large diameter outer conductors – Reduces risk of corona discharge – Wide bandwidth – Reduces the impact of icing on VSWR performance MPX Series Medium Power FM Antenna
Description:The list of books you might like
