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New TRASAR® UHF Television Antenna in Final Test

This is a top mounted, elliptically polarized,  UHF TRASAR® television antenna in the process of having final test data taken. All ERI top mounted television antennas are provided with dedicated climbing facilities that do not penetrate the radome. This prevents potential contamination or moisture intrusion into the antenna radome which can cause corrosion, impact electrical performance and shorten the antenna’s useful life. This also provides climbers superior access to the beacon and improves safety.

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Another 788 All Pass™High Efficiency FM Analog/HD Radio™ Diplexer in Assembly

This item is an ERI Model 788A-SP High-Efficiency FM Analog/HD Digital Diplexer. ERI’s innovative All Pass™ design allows stations to operate hybrid digital with HD Radio™ power levels up to -10dBc. The All Pass Diplexer maintains high efficiency while incurring a much smaller penalty to performance than other methods currently available. The analog insertion is less than 0.35 dB, and the digital HD Radio signal loss is less than 1.4 dB with digital group delay variation less than 600 nsec and is fully compliant with the HD Radio™ FM Transmission System Specifications. The 788 is an ideal choice for FM stations that have very high FM transmitter power output requirements due to long transmission line runs and also have the desire to operate at elevated HD power levels.

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ERI CF103 Low Power FM Group Delay Equalizer

The ERI Model CF103 Low Power FM Group Delay Equalizer provides group delay pre-correction for FM transmitters at low level, usually between the FM transmitter’s exciter and intermediate power amplifier.  The pre-correction applied offsets excess group delay variation and asymmetry that is unavoidable in FM combiner systems that include closely spaced frequencies, of 1.8 MHz or less.  The CF103 has a power rating of 150 watts and provides up to one microsecond of correction across a single FM broadcast channel.  ERI also has available group delay equalizers that operate at high power, which offer greater correction range and are located directly before each individual station’s combining module.

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WDAE, AM 620, Tampa/St. Petersburg the First Directional AM Array

The tower pictured is one of two (2) 360-foot base insulated AM towers that straddle West Gandy Boulevard, the Courtney-Campbell Causeway. This AM facility operates at 620 kHz and was originally owned by the City of St. Petersburg and operated with the Call Letters WSUN and in 1932 became the first directional AM facility. The directional nighttime pattern protects co-channel WTMJ, Milwaukee. These two towers were designed, fabricated and installed by ERI 2005. The base section of each tower is a four-sided structure that matches the base dimension of the original towers built in 1932. Each tower transition to a traditional triangular configuration for most of their height.

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Department of the Navy Gold Coast 2020


The San Diego Chapter of the National Defense Industrial Association (NDIA) is proud to present the 32nd Annual Department of the Navy Gold Coast Small Business Procurement Event, “Small Business: Providing Innovation for the Navy the Nation Needs“, from 31 August – 2 September, 2020.

The NDIA Department of the Navy Gold Coast Event is the premier Navy procurement conference in the country. Gold Coast provides a forum to educate, guide, and assist businesses, large and small, in support of the warfighter mission within Department of the Navy and throughout the DOD.

The event provides exciting and relevant topics delivered by government and industry experts – and boasts insightful panels, workshops and networking events. Of course, you won’t want to miss the opportunity to meet key government and industry contracting personnel through our one-on-one matchmaking sessions – the hallmark of Gold Coast. On the exhibit floor, you will have an opportunity to visit over 200 government agencies and industry organizations, including the ten Navy Systems Commands.  (information provided by )

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FM Antennas and One with an INVISI-SHIELD®

The tower pictured is the Milwaukee PBS 3-arm candelabra tower located in Milwaukee’s Estabrook Park neighborhood. At the tower top are Milwaukee PBS’s television stations WMVS and WMVT, WVTV, WIWN and a number of Low Power TV facilities. On the tower shaft below the candelabra is Milwaukee Radio Alliance’s B93.3, WLDB, which is the 2-bay ERI SPHX-2AE which is near the top of the photo. The antenna below that is iHeart’s WMIL-FM’s ERI SHPX-2AC auxiliary FM antenna, which is equipped with optional radomes, and is protected from falling ice by an ERI INVISI-SHIELD®, Electrically Transparent Ice Shield. WMIL-FM’s main antenna is also an SHPX-2AC with radomes and it is out of frame at a little over 100-feet above the WLDB antenna.

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A New UHF RF System for the Repack

This is a UHF RF System for a Repacked Television Station. The system includes a 6-section UF5000 band pass filter, a 5 kW test load, a 3-port QUICK PATCH™ Coaxial Patch Panel and adjustable directional couplers at the filter input and output and at the test load input. The system is rated for 5.0 kW average power. The system is integrated into a floor mounted rack frame.