Transmission Line

ERI offers complete line of broadcast transmission line including Rigid coaxial line, coaxial cable, elliptical waveguide, circular waveguide, and rectangular waveguide.

Rigid Coaxial Transmission Line

MACXLine® rigid coaxial line with bellows is available from ERI in sizes from 3-1/8 inch through 8-3/16 inch. ERI also offers STDLine for interior and short run applications, both flanged and unflanged components from 7/8 inch through 8-3/16 inch sizes. 1329Line is an aluminum outer conductor rigid line product that uses MACXLine inner conductors and is an economical and lighter weight alternative to traditional copper/brass rigid line. Download ERI's Rigid Transmission Line Catalog
Circular Waveguide

GUIDELine™ circular waveguide is the best choice for long vertical runs. It has substantially lower wind loads than equivalent rectangular waveguide, allowing it to be used on towers where rectangular system cannot be used. With attenuation up to 50% lower than corresponding rectangular waveguide, it is the most efficient transmission line available. You may be able to use a smaller, less-expensive transmitter! Unlike truncated elliptical waveguide, on-site tuning is completely eliminated by the use of cross-polarization canceling pins.
Rectangular Waveguide

For transmitter room applications, inexpensive thin wall rectangular waveguide is a good choice. Pressurizable thick wall rectangular waveguide connects the base of the vertical run to the transmitter building. ERI manufactures a complete line WR1150, WR1500, and WR1800 components, including E-plane and H-plane elbows, miters, and fine matchers.

WR1150 Series Standard Rectangular Waveguide (11.5 inch by 5.75 inch) / WR1500 Series Standard Rectangular Waveguide (15 inch by 7.5 inch) / WR WR1800 Series Standard Rectangular Waveguide (18 inch by 9 inch) /
Components and Accessories

ERI provides a broad range of products include RF components (either coaxial and waveguide) for combiners, hybrids, diplexers, directional couplers, motorized switches, RF loads, and much more. With the ability to call on decades of previous system designs and configurations and the significant internal engineering and manufacturing expertise ERI can quickly respond to requirements whether they be broadcast, military, or scientific applications. ERI manufactures a variety of useful installation accessories for the installation of semi-flexible coaxial transmission lines and elliptical waveguides. These include insulated hangers for use on “hot” AM radio station towers, hoisting grip attachment kits and round member and angle member adapters.