Welding flanges onto the legs of a new ERI LAMBDA® Optimized FM Mounting System. The LAMBDA® mounting system was designed initially to reduce FM antenna failures due to stresses from tower movement. The design specified a maximum bending radius of the top-mounted free-standing tower sections, and this resulted in a very stiff tower designed to support side-mounted FM antennas. Typical 20-foot tower sections do not allow symmetrical antenna element mounting locations because the cross members will have a different geometry behind each of the array elements. LAMBDA tower sections make the signal scattering from the tower a constant because the structural member spacing is a halfwave at the operating FM frequency. All the antenna array elements see the same tower face geometry because the tower’s reflected (scattered) signal is identical for each bay of the array.
The top-mounted TRASAR® UHF Television Antenna is partially through slotting. Once the outer conductor slots and holes have been cut, the base flange will be welded to the outer conductor, and the antenna will be sent to galvanizing. The antenna assembly and final tuning and test should be complete in less than 60 days.
Another 16-Bay AXIOM® Master FM Antenna is nearly complete and ready for shipment to site. The AXIOM is a very cost-effective multi-station FM antenna available in 4, 8, 12, and 16 bay models with power handling capability in a dual input configuration of up to 240 kW. The AXIOM is optionally available with radomes or electrical deicer for harsh locations with significant snow and ice accumulation.
A new ALV Series 8-bay high band VHF television antenna is now complete and tested. The antenna is awaiting shipment to its permanent home. The ALV Series is a single channel high band VHF slotted array antenna available in 2, 4, and 8 bay models. ERI is now offering versions of the ALV Series antennas with circular and elliptical polarization. The horizontally polarized models of the ALV antennas also continue to be available. These are highly reliable, lightweight, low wind load, side-mounted high band VHF television antennas that most often used for auxiliary antennas for full-service television stations, TV translators, and low power TV stations.
The antenna pictured is the new ERI TRASAR® elliptically polarized UHF television installed for WXXI-TV’s new repack RF Channel 22 antenna. The move from RF Channel 16 to RF Channel 200 was part of the FCC mandated repack to free up RF spectrum for wireless communications. The antenna is mounted at the top of the 276-foot WXXI owned tower on Pinnacle Hill southeast of Rochester. The top of the TRASAR antenna is 345-feet above ground level. This antenna replaced the RF Channel 16 elliptically polarized ERI TRASAR antenna installed in 2014. Photo courtesy of Mike Fitzpatrick/NECRAT.us.
These are four bays of an eight-bay full wavelength bay-to-bay spaced ROTOTILLER® FM antenna. The antenna has completed tuning and testing and has received its final coat of paint. It is now being packed for shipment to the site that will be its new home for the next few decades.
Pictured is a single bay Model LP-1E ROTOTILLER® FM antenna in tuning on ERI’s Tuning Deck. This antenna is rated to handle up to 9 kW of input power. This antenna will be leg-mounted, and the mounting bracket and all other required components are supplied with the antenna.
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.
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.
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.