Preselectors/Post Filters on Bird Technologies

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	Preselectors/Post Filters
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	larger image		Preselectors/Post Filters TX RX 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.

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Item #	Frequency Range (MHz)	Number of Cavities/Resonators	Pass Bandwidth (MHz)	Specification Bandwidth (MHz)	Typical Insertion Loss (dB)

89-36-03A	132-150	4 x 4"	0.5 to 2.0	1.0	N/A

89-37-01K	144-174	3 x LC	4 to 10	1.0	N/A

89-37-06A	144-174	4 x 4"	0.5 to 2.0	1.0	N/A

89-37-06C	144-174	4 x 4"	0.5 to 2.0	1.0	N/A

89-37-13A	144-174	4 x 6.625"	0.5 to 2.0	1.0	N/A

89-56-05A	380-420	6	5	5	1.5

89-65-01A	406-430	4 x 4"	0.5 to 2.0	1.0	1.6

89-65-12A	406-430	3 x 2"	1.0	1.0	2.5

89-66-02A	430-450	3 x 2"	1.0	1.0	2.7

89-68-06A	450-512	8-Resonator	2	2	2.5

89-70-01A	450-470	4 x 4"	0.5 to 2.0	1.0	1.6

89-70-24A	450-470	3 x 2"	1.0	1.0	2.5

89-70-27A	450-470	8-Resonator	4	4	2.5

89-70-28A	456-460 466-470	Dual 8-Resonator	4/4	4/4	4.0

89-83C-01-32	792-824	2	32	32	1.5

89-83F-02-03	792-806	N/A	3	N/A	2.0

89-83F-02-06	792-806	N/A	6	N/A	1.5

89-83F-02-09	792-806	N/A	9	N/A	1.0

89-83F-02-14	792-806	N/A	14	N/A	1.0

89-86A-02-03	806-824	N/A	3	N/A	2.0

89-86A-02-05	806-824	N/A	5	N/A	1.5

89-86A-02-10	806-824	N/A	10	N/A	1.5

89-86A-02-15	806-824	N/A	15	N/A	1.0

89-86A-20-03	806-824	5	3	3	2.0

89-86A-20-05	806-824	6	5	5	1.3

Preselectors/Post Filters