The P-300/P-350 vertically polarized FM dipole antenna may be used as a single element where a vertically polarized only orientation is desired or may be used in combination with any type of horizontally polarized antenna system.
The P-300/P-350 antenna consists of a large diameter radiating dipoles and interconnecting transmission line sections. The dipoles are electrically and mechanically identical. Each element is spaced one wave length apart with a coupling rigid transmission section. The input port to the antenna is a standard EIA, 50 ohm flange. When used in combination with horizontal elements the system is furnished with suitable power dividers and impedance matching networks between elements.
The P-300/P-350 dipole is a broad-band radiator (low Q) which minimizes cross-coupling between main and subcarrier channels. The P-300 dipole is fabricated from 85/15 brass which has excellent mechanical and electrical properties. This antenna is rugged, light-weight, and presents low wind load forces.
The P-350 vertically polarized FM dipole antenna is a higher power version of ERI’s well known P-300 dipole antenna. Using the same quality materials and manufacturing process that has been used for decades, ERI has modified the design only by increasing the power handling capability of the individual elements. The single bay input power rating has been increased to 10 kW for the Series A and Series B dipoles, and 56 kW for the Series C dipoles. Multiple elements may be used to increase power gain and allowable input power levels. Null fill and beam tilt are also available.
Antenna arrays of eight (8) bays or less are fed at the bottom bay through a six (6) foot matching section. Nine (9) or more elements are center fed through the six (6) foot matching section piece and a coaxial “T” connector. If the support structure has a large face dimension, several P-300/P-350 dipoles may be mounted around the periphery to obtain 360° coverage. This configuration would be fed in parallel by individual, equal-length feed lines from a power divider. ERI recommends a tower/antenna analysis if this option is employed.
Note: Except where noted options available at additional cost.
Each antenna mounting bracket is designed and fabricated to match the tower and mounting specifications of the purchaser. The antenna can be side or pole mounted. Custom designed and fabricated antenna support poles and tower sections are also available from ERI. The horizontal radiation pattern of the P-300/P-350 dipole is omni-directional in free space. The extent of deviation from a circular pattern will vary with the type and size of the supporting structure. For the best possible circular pattern we recommend the antenna system be mounted on an ERI antenna support pole. Structural design information is required if the P-300/P-350 system is to be placed on another manufacturer’s support structure.
Combine an ERI antenna with an ERI Mounting Structure, Pattern 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.
ERI Mounting 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 market. Contact Electronics Research for complete electrical and mechanical specifications.
P 300/350 Series Vertically Polarized FM Radio Antenna Brochure > Download File
(Type: Brochure; Publication Number: 20090317007_AEN; Language Code: EN; Revision: 01)