RFS offers a comprehensive range of FM combiners to suit all common FM combining applications. The balanced, or constant impedance, bandpass design provides the best possible frequency response and specifications, and is ideal for large multi-station channel combiners or when frequency spacings are very close.
A balanced module consists of a balanced pair of bandpass filters, two 3dB couplers and a balancing load. The narrowband input corresponds to the filter resonant frequency, whereas the wideband input can be any other frequency in the 87.5 - 108 MHz band. The wideband input signal loss is very low because it does not pass through the bandpass filters. Modules can therefore be cascaded to form a multichannel combiner. The modular design enables extra channels to be easily added at a future date.
FEATURES / BENEFITS
Compact size with small footprint for design power rating
Can be field retuned to any frequency in the 87.5 - 108MHz band
Invar temperature compensation for stable operation
Vertical entry and exit without additional elbows
Natural convection cooling
Group delay corrector modules are available for complex multichannel systems
Integrated coupler and filter design for high reliability
Custom options with U-Links, motorised coaxial switches, monitoring systems, etc. are available
Balanced FM Combiner with Integrated Couplers on 3 Pole 400mm Filters