ROTOTILLER® SA Series Shared Aperture FM Antenna

Antennas

Shared Aperture FM Antennas for Simulcast FM HD Radio™

ERI Shared Aperture FM antennas for simulcast analog and IBOC digital transmission operation are an antenna configuration utilizing the industry leading ROTOTILLER® Series FM antennas, with an installed base, worldwide, larger than any other FM antenna type or design. The system is capable of implementing the proposed increase to digital IBOC effective radiated power (ERP) levels of up to 10% (-10 dBc) of authorized analog ERP. The shared aperture antenna system is available in a large variety of configurations and utilizes construction methods that yield analog to digital isolation ratios of -40 dB, for single frequency applications. The antenna systems are also available in arrays that are suitable for multiplexing two or more signals into a common antenna and transmission line. In addition, to multiplexed designs the shared aperture FM antennas are available as directional FM arrays and can be measured and optimized for best radiation performance on ERI’s full scale antenna test range. The key benefits of the shared aperture approach, versus other methods of combining analog and digital signals for simulcast include: • The analog and digital antennas can be mounted at the same, or nearly the same, height above average terrain to maintain coverage symmetry. • The arrays can be configured for very high power handling capability to accommodate the requirements of grandfathered super power FM facilities. • Shared aperture arrays, as is true of ERI’s unique LYNX™ Dual Input FM Antenna, is a low loss method of combining analog and digital FM signals which does not waste digital or analog power into reject loads, as is required with hybrid injectors. • Shared aperture arrays can be configured to transmit combined FM signals and as directional FM antennas. • The shared aperture antenna design consumes little or no additional tower space and the analog and digital arrays are fed with independent transmission line, which enhances overall system reliability.

HD Radio is a trademark of iBiquity Digital Corporation.

Electronics Research, Inc. • 7777 Gardner Road • Chandler, IN 47610-9219 • USA +1 812 925-6000 (tel) • +1 812 925-4030 (fax) Your Single Source for Broadcast Solutions™ • Call Toll-free at 877 ERI-LINE • Visit Online at www.eriinc.com © 2016 Electronics Research, Inc. All rights reserved. Printed in USA (No. 20190710_1_AEN) Revised 2019 Around the World, Across the Spectrum, Your Single Source For Broadcast Solutions Antennas | Transmission Line | Filters/Combiners | Towers | Broadcast Services

About Electronics Research, Inc. Founded in 1943, Electronics Research, Inc. delivers high quality, innovative, integrated solutions to broadcasters across the U.S. and around the world. Our dedicated staff of engineers, designers, fabricators, and project managers take pride in contributing to your success by providing AM, FM, VHF, UHF, BRS-EBS, and Mobile Media broadcast systems including the industry’s best antenna, transmission line, filter and combining, and tower and structural support systems. In addition to manufacturing the full range of broadcast system components and installation accessories, ERI offers all of the engineering and field services needed to plan, install, optimize, and maintain your broadcast facility. We are your single source for broadcast solutions. Broadcast Antenna Systems Transmission Line Systems • ROTOTILLER® FM Radio Antenna • MACXLine® Rigid Transmission Line with Bellows • LYNX™ Dual Input for IBOC FM Radio Antenna • HELIAX® Air- and Foam-dielectric Coaxial Cable • 1105 Circularly Polarized FM Radio Antenna • HELIAX® Standard Elliptical Waveguide • 100 Low Power Circularly Polarized FM Radio Antenna • GUIDELine® Circular Waveguide • FM Low Power Horizontally Polarized Educational FM Radio • Standard Rectangular Waveguide Antenna • P300/P350 Series Vertically Polarized FM Radio Antenna • Dehydrators and Pressurization Equipment • 1180 and 1090 Series Broadband Panel FM Radio Antenna Filter and Combining Systems • SLIMWING™ Batwing VHF Television Antenna • FM Radio Filter and Combining Systems • CRUCIS™ Crossed Dipole VHF Television Antenna • UHF and VHF Television Filter and Combining Systems • STINGRAY™ Broadband Panel VHF Television Antenna • DAB Filter and Combining Systems • TRASAR® High Power Traveling Wave Television Antenna • Mobile Media Filter and Combining Systems • AGW Guided Wave Quick-Deploy Emergency UHF Television • RF Components Antenna • System Monitoring and Protection Components • STINGRAY™ Broadband Panel UHF Television Antenna • ALP Low and Medium Power UHF Television Antenna Structural Support Systems • Guyed Towers • AL PLUS Low and Medium Power UHF Television Antenna • Self-Supporting Towers • AL8 Low Power UHF Television Antenna • Roof-top Antenna Support Structures • VELA™ Low Power Vertically Polarized Broadband UHF Television • Specialty Structures and Custom Antenna Supports Antenna • HMD BRS-EBS Antenna RF and Structural System Services • SHADOWMASTER® Shadow-Filling BRS-EBS Antenna • RF Field and Engineering Services • Installation and Structural Engineering Services

Electronics Research, Inc. 877 ERI-LINE (toll-free: North America) 7777 Gardner Road www.eriinc.com (web) Chandler, Indiana 47610-9219 +1 812 925-6000 (international) All designs, specifications, and availabilities of products and services presented in this USA +1 812 925-4030 (fax) publication are subject to change without notice.