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A New Three-Bay ERI LPX Series FM Antenna in Final Tuning and Test

A new three-bay LPX Series ROTOTILLER® FM Antenna has been tuned and is now under a pressure test to confirm the assembly does not leak air. After the test, the antenna will be painted and packed for shipment to the customer. The LPX-3E end-fed array is rated to handle up to 9 kW, and it is available with radomes or electrical deicers for installations in harsh Winter climates.

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NECRAT.US features WEOW (FM) and WAIL (FM) serves Key West with an ERI 12-Bay ROTOTILLER®

 

An ERI twelve-bay diplexed ROTOTILLER® FM antenna transmits WEOW (FM) and WAIL (FM), both Class C1 FMs with a 100 kW ERP. The antenna has a branch feed system to improve the system bandwidth. The 12-bay array combines two six-bay center-fed arrays into a single input. The antenna is designed so co-owned WCNK (FM), 98.7 MHz, and WWUS (FM), 104.1 MHz, could also operate from this antenna. The FM channel combiner feeding the antenna is an FM junction combiner consisting of two ERI 783 FM bandpass filters. The tower was also designed and manufactured by ERI. It is a 57-inch face 600-foot structure manufactured and installed by ERI in 2012. Photo courtesy of Mike Fitzpatrick. More great photos found here.

 

 

 

 

 

 

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Starting final tuning and assembly for a new six (6) station constant impedance FM channel combiner

Starting final tuning and assembly for a new six (6) station constant impedance FM channel combiner

The cavities, resonators, and transmission line components for a new six (6) station constant impedance FM channel combiner are complete. They are now in ERI’s Filter Lab for setup, tuning, and final assembly. The system should be done, and the final test and performance data will be taken by the end of the month. The eight-bay AXIOM® Master FM Antenna will be ready for final tuning soon.

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FM Bandpass Filter Cavities for a New FM Channel Combiner

These are bandpass filters for a new FM Tee Combiner for two FM stations in Missouri. The two three-section bandpass filters will combine the two stations and feed a new diplexed eight-bay ROTOTILLER® FM antenna. Most of the ROTOTILLER FM antennas built by ERI are made for only one FM channel and transmit a single channel. The antenna can also be designed to transmit two, three, or more FM stations from one antenna. In this case, the two FM stations are 13 MHz apart. The SHPX-8C3-SP FM antenna consists of two four-bay center-fed arrays combined with an additional center feed.

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Finishing a Batch of New ROTOTILLER® FM Antennas

 

An LPX-6C six-bay low-power ROTOTILLER® FM antenna finished tuning, painted, and ready to be packed for shipment along with the LPX-2E, with optional radomes, also prepared to be packed and shipped for another customer. On the far right is the last bay of a new SHPX-10AC high-power ROTOTILLER® FM antenna bound for North Dakota by the end of this week.