This three station branch FM channel combiner has just completed tuning and testing and will be disassembled for painting and shipment to site. The combiner will feed an ERI AXIOM® master FM antenna that will provide auxiliary transmission facilities for three (3) FM radio stations in a Top 50 US Radio Market. The system combines three Class C FM stations into a single rigid transmission line feeding a 12-bay broadband ERI AXIOM Master FM antenna.
The antenna loaded on this truck is leaving ERI to be installed the following day by one of ERI’s Installation Crews. This is a top mounted UHF TRASAR® television antenna. The fiberglass climbing ladder will be installed by the installation crew when the antenna arrives on site and just before it is hoisted into place.
The filter pictured is a UHF RF System with a six-section reflective full service FCC mask filter for RF Channel 16. The filter system was built for KTKA (DT), Topeka, Kansas. The mask filter is mounted in a support frame and the system includes a dual port adjustable directional coupler at the filter output and a four-port 1-5/8-inch motorized coaxial switch which will direct the system output to either the antenna or a system test load (not shown).
WTVF was mandated to change its operating RF Channel from 25 to 36 as a part of the FCC Repack of television stations, currently underway. The top-rated CBS Affiliate serving Nashville contracted with ERI to provide and install a replacement side mounted TRASAR® UHF television antenna to replace its current standby antenna, which ERI installed on the WTVF tower at 766-feet above ground level. The new top mounted main antenna also purchased from ERI sits atop a 140-foot, self-supporting, 48-inch square support spine that ERI designed, manufactured and installed in 2012 as a part of the construction of WTVF’s post-transition digital transmission facility on its final RF Channel 25 assignment. The new elliptically polarized TRASAR® UHF television antenna replaced the RF Chanel 25 TRASAR installed in 2012. The new antenna also included a 4.5-foot pedestal interface to maintain the same overall height of the tower. In addition to the main and auxiliary WTVF, Channel 25, TRASAR antennas the tower also a side mounted RF Channel 5 panel antenna for co-owned LPTV WTVF-LD. Photo courtesy of ERI’s installation subcontractor for this project FullWave Tower & Broadcast, LLC.
The KYLD ERI Model DI-4A LYNX™ 4-Bay Dual Input FM Antenna, mounted at the top of this tower, is iHeartMedia’s KYLD main FM antenna on San Bruno Mountain. This antenna includes two inputs the combine separate analog and digital HD transmitters to provide a hybrid FM service. The two ERI ROTOTILLER® FM antennas mounted below the LYNX antenna are a Model LPX-3E which is an auxiliary antenna for iHeart’s KISQ (FM) and an ERI Model LPX-2E which is KYLD’s auxiliary antenna. Photo courtesy of Doc Searls.
Located on Clingman’s Peak, one of the highest FM transmitter sites east of the Mississippi, Billy Graham Evangelical Association’s WMIT is a grandfathered superpower FM station. The Main FM antenna is a 4-bay COGWHEEL® FM antenna top mounted on the tallest tower pictured. WMIT operates with an effective radiated power of 36 kW at a height above average terrain of 3,091-feet and covers a large area. Its signal can be heard in the Tri-Cities of Tennessee (where it provides city-grade coverage), Greenville/Spartanburg, Charlotte and its hometown of Asheville. The 6-bay, half wavelength spaced ROTOTILLER® pictured on the tower to the left is WMIT’s auxiliary FM antenna. Photo courtesy of Doc Searls.
These towers are 496-foot self-supporting base insulated AM towers for Disney owned WEPN AM 1050 New York. The towers were manufactured and erected in 2009. The station operates with a directional pattern with different parameters for daytime and nighttime. The facility is licensed to operate with 50 kW day and night. Photo courtesy of Doc Searls.
The antenna pictured is an ERI Model SHPX-8AC built for WGBH-FM, Boston. The antenna is supported by an ERI LAMBDA™ Optimized FM Mounting System which ERI installed on the existing self-supporting WGBH-FM tower on Great Blue Hill. WGBH-FM is grandfathered and operates with an effective radiated power of 100 kW. ERI also installed the new antenna and the LAMBDA mounting structure.
This RF system includes two (2) 6-section UHF band pass filters and will be part of a two-cabinet UHF television transmitter that will operate with a transmitter power output (TPO) of 30 kW. The two individual power amplifier cabinets will operate at 15 kW each and each have their own 6-pole band pass filter at the filter outputs a 6-inch 3 dB y-brid will combine their output to achieve the 30 kW total power required to achieve the station’s authorized effective radiated power (ERP).
The ALP Series, with a medium cardioid azimuth pattern, UHF television antenna is almost finished packing and will be leaving to begin service as an auxiliary antenna for a Full Service TV station. This is a low power model which is rated to handle up to 5 kW average power. The medium power version handles up to 10 kW.