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Bird - The RF Experts
81 Series
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81 Series

Bird manufactures 81 Series, Intermodulation Suppression Panels that incorporate an isolator with a high power load and a second harmonic filter on a 19” rack-mount shelf assembly. These are typically used to add an isolator to a transmitter or repeater connected to its own antenna. Although the unit itself is only 2 rack-units high (3.5”), care must be taken to budget enough space above the unit to provide adequate ventilation for the load’s heatsink.

81 Series, Intermodulation Suppression Panels
Model Number Frequency Number of Isolators RF Loads Power Rating (W)
81-37-95149-1D 144-174 MHz 1 100
81-37-95149-2D 144-174 MHz 2 5/100
81-66-95149-2C 442-450 MHz 2 5/60
81-70-95149-2C 450-470 MHz 2 5/60
81-70-95149-2D 450-470 MHz 2 5/100
81-87A-95149-1D 851-869 MHz 1 100
81-87A-95149-2D 851-869 MHz 2 5/100
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81 Series
product specifications:
Item No
81 Series
Item Name
Intermodulation Suppression Panels