1.25:1 maximum with field tuning
ERI offers 4, 8, 12, and 16-bay versions of its AXIOM™ master FM antenna. The AXIOM is a specially designed antenna system which provides high input power handling capability and can provide service as an auxiliary master FM antenna for systems that are limited to a band width requirement of up to 18 MHz of the FM Band (88 MHz to 108 MHz). The antenna can be designed with a single RF input or can be configured as separate upper and lower antennas for higher power handling capability and redundancy.
ERI antennas are unchallenged in quality and dependability. ERI is the only manufacturer to use large diameter outer conductors and a completely enclosed, pressurized, internal series feed system. The result is a simple and reliable method of coupling power to the elements. Unlike competing designs, ERI series fed antennas do not require a troublesome secondary current loop for element excitation with all the resulting disadvantages. All ERI antennas include brackets for mounting on leg, pole, or face mounting (up to 42-inch uniform cross section tower), brackets for other mounting configurations are optionally available. The ROTOTILLER® series FM antenna’s unique design consists of two series fed, bent dipole elements which form a space phased, circularly polarized radiator. The antenna's configuration and the large diameter of the radiating elements contribute to the excellent bandwidth of the antenna system, and also inhibits corona discharge.
The horizontally polarized horizontal plane azimuth pattern of the SHPX series antenna is omnidirectional within ±2 dB when the antenna is pole or Lambda™ mounted atop a tower. Side mounting the antenna on a typical tower structure will affect the azimuth pattern. ERI offers a pattern measurement service to assist in determining the effect of the mounting structure on the antenna's pattern. Using ERI's pattern optimization service the pattern's circularity may be improved through the addition of parasitically excited elements.
Utilize the ERI advantage, combine an ERI antenna with an ERI Lambda™ Mounting Structure, Pat-tern Measurement and Installation. Assure yourself of the best antenna/tower interaction. ERI's Pattern Measurement service will provide the crucial answers concerning the relationship between the antenna mounting orientation and antenna pattern. Lambda Sections are designed to achieve optimum antenna performance while reducing weight and wind loads. Only ERI can offer you an antenna/tower/installation package that will achieve your highest expectations in a demanding FM radio market.
Special configurations available for up to 120 kW average power, when configured with a single RF input. Available with dual inputs for higher power handling capability.
Note: Except where noted options available at additional cost.
Diagram shows typical mounting configuration for Model SHPXA, 8 Bay
ROTOTILLER® Axiom™ Series Circularly Polarized Broadband Auxiliary FM Radio Antenna Brochure > Download File
Topics Include:
(Type: Brochure; Publication Number: 20090317001_AEN; Language Code: EN; Revision: 03)
ROTOTILLER® AXIOM™ Series 4-Bay Model Circularly Polarized Broadband FM Antenna Brochure > Download File
(Type: Brochure; Publication Number: 20091014001_AEN; Language Code: EN; Revision: 02)