RF transmission support equipment manufacturer Electronics Research Inc. is joining the cavalcade of combiners being introduced at the 2016 NAB Show.
The Model FI136 is a low-power Tee combiner capable of combining two FM channels up to one kilowatt each, 2 kW combined. It is aimed at FM translators sharing an antenna. Frequency separation must be at least 1.6 MHz. The filter set is constructed of lightweight aluminum with copper resonators. Nonadjacent coupling increases rejection of transmitter out of band emissions. The combiner is temperature-compensated and includes a single port directional coupler at the combined output and directional couplers for the combiner inputs are optionally available.
The Model FI836 (shown) is also a two-channel model but its power rating is significantly higher at 15 kW per input or double that with a forced-air-cooling option. Spacing for the FI836 is a minimum of 1.8 MHz between channels though closer frequencies can be handled as a special order. The company says that the bandpass filters are integrated into a single compact floor mounted cabinet that requires little or no on-site combiner assembly.
NAB Show Booth: C2324