Bird - The RF Experts
0-174 MHz, Preselectors and Post Selector Filters
0-147 MHz, Preselectors and Post Selector Filters
0-174 MHz, Preselectors and Post Selector Filters

Bird Technologies has designed application-specific multi-cavity filter products for use in limiting the bandwidth in front of a multiple-receiver system (Preselector) or after a multiple-transmitter system (Post Selector). Size and complexity range from a model built from three helically-loaded 1.3-inch rectangular resonators for relatively low-selectivity receive-only applications, where 2 dB of loss can be tolerated, to four 6.625-inch cavities that can handle 400 watts with high selectivity and loss of 1 dB or less.

0-147 MHz, Preselectors and Post Selector Filters
0-174 MHz, Preselectors and Post Selector Filters
Check up to five products to compare
Item No
Item Name
RF Power
Number of Cavities Resonators
Pass Bandwidth
132-150 MHz, Preselector
125 W
4 x 4"
0.5 to 2.0 MHz
144-174 MHz, Preselector
(Watts) RX-Only
3 x LC
4 to 10 MHz
144-174 MHz, Preselector
125 W
4 x 4"
0.5 to 2.0 MHz
144-174 MHz, Preselector
125 W
4 x 4"
0.5 to 2.0 MHz
144-174 MHz, Preselector
400 W
4 x 6.625"
0.5 to 2.0 Mhz