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Tower Legs for a New 90-Foot Self Supporting Microwave Tower for Puerto Rico

The forklift is off-loading a truckload of leg steel back from galvanizing for a new 90-foot self-supporting tower to be shipped and installed in Puerto Rico. This tower will support four (4) 6-foot parabolic grids and a VHF yagi receive antenna. The next step is an inspection by ERI quality assurance personnel to confirm that each leg has been properly galvanized per engineering and ASTM specifications.

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New High Power RF Channel 8 Top-Mounted TRASAR® Television Antenna Ready to Head to Shipping

This new high-power RF Channel 8 TRASAR® television antenna is through final tuning and test and is ready for shipment to site. A top-mounted nondirectional television antenna is horizontally polarized and uses a galvanized steel climbing pole for beacon access. If the antenna included a vertically polarized component, it would have a fiberglass climbing. All ERI top-mounted television antennas are provided with dedicated rigging lug attachments at the base of the antenna. This offers superior load control during lifting and installation. It also allows for reduced gin pole headroom (aka cantilever), which ultimately reduces the gin pole size required. This also provides climbers superior access and safety.

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Spanish Broadcasting Systems WLEY-FM’s Directional SHP Series ROTOTILLER® FM Antenna

AN ERI directional FM antenna the licensed primary antenna for Spanish Broadcasting’s WLEY-FM in Chicago (Aurora). The FM antenna is an ERI Model SHP-4AC-DA-HW 4-bay array with half-wavelength bay-to-bay spacing. The directional FM antenna is installed at the top of a 748-foot AM tower in Bloomingdale (IL), owned by Entercom and home to WSCR, 670 kHz (formerly WMAQ) and WBBM 780 kHz. Photo owned by and courtesy of Mike Fitzpatrick/NECRAT.us.

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Two new FM Bandpass Filters for the Windy City

These filter cavities were just finished with painting and heading for packing and shipment to their home in Chicago. The two 4-section FM bandpass filters are headed to the Willis Tower in Chicago for installation at separate main and auxiliary FM transmitters. When assembled, the filters will have forced air-cooling on each tank. They can handle up to 10 kW, after filter losses.

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ERI Model 425 FM Isolation Transformer finished with tuning and final test

The Model 425 FM Isolation Transformer is finished with tuning and test, and it’s way to shipping. This type of transformer allows the transmission line feeding an FM antenna to pass the transmitter power across the base insulator of a series fed AM tower. The Model 425 is rated to handle up to 25 kW of FM power and up to 40 kV Peak AM Voltage while adding very little additional AM Shunt Capacitance.

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New AXIOM® Master FM Antenna Installation on West Tiger Mountain to Serve Seattle

The two towers pictured are 328-foot self-supporting towers owned by American Tower on West Tiger Mountain east of Seattle, Washington. The towers were manufactured and erected by ERI in 1999. The tower on the left includes a T-Bar that supports two UHF television antennas. The tower on the right now supports a new ERI LAMBDA® Optimized FM Mounting System that is 135-feet tall. The FM antenna is a 16-Bay AXIOM® Master FM Antenna that is fed by two 6-1/8-inch, 50-ohm, rigid transmission lines. The antenna is the primary FM antenna for six Seattle FM stations.