Electronics Research, Inc.

02/17/2025

This nine-bay SHPX-9AC, off-center fed nine-bay ROTOTILLER® FM Antenna is in final tuning. After tuning is complete, the antenna end caps will be soldered, the antenna painted, and then sent to shipping for packing and shipment. It should be on site in less than one week.

02/10/2025

A 12-bay elliptically polarized ALP Series UHF television antenna is non-directional and built specifically for RF Channel 24. The antenna is fully assembled and ready for shipment.

02/03/2025

A ten-bay "B" Series ROTOTILLER® FM antenna is set up for tuning in one of ERI's three tuning buildings. The FM antenna is designed and built to multiplex five (5) Class C (100 kW ERP) Full Service FM stations. ERI is also providing the 6-1/8-inch rigid transmission line and the FM channel combiner for the new system.

01/27/2025

A five (5) channel 783 Series FM combiner system with three reflective FM bandpass filters in a manifold configuration and adding the last two channels with constant impedance 783 combiner modules. ERI is also supplying a run of a 6-1/8-inch rigid transmission line and a high-power ten-bay multiplexed ROTOTILLER® FM antenna for this system.

01/20/2025

An FM channel combiner constructed from two (2) four-section FM reflective bandpass filters will add two new frequencies to an existing three (3) channel constant impedance FM combiner system. The FI940 is a compact, folded design four-section FM bandpass filter with integrated non-adjacent coupling. The adjacent coupling allows two FM channels as closely spaced as 0.8 MHz to be combined with group delay variation that meets the requirements for hybrid analog and HD digital operation. Some manufacturers use five-section filters for these applications, which increases group delay variation to values greater than the 600 nanoseconds maximum recommended.

01/06/2025

12/30/2024

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