57-45-04 Combline Filter/Preselector
Typical Insertion Loss: 3.0 dB
Frequency Range, MHz
Insertion Loss Bandwidth, dB
Pass Bandwidth, MHz
Return Loss, dB (VSWR)
Typical Selectivity, dB @ MHz
38 @ 5
Temperature Range, ºC
-30 to +60
Input Power, Watts
Dimensions H x W x D, in (mm)
5.25 x 19 x 4.5 (133 x 686 x 114)
The combline filters are designed for minimizing interference from adjacent channels and outside systems. They are available in a wide range of bandwiths and frequency splits. Used in front of a wideband receiver multicoupler, the preselectors narrow the passband to the desired bandwidth. Each filter is temperature-compensated for operation between -40ºC to +60ºC. Each filter has silver-plated loops and tuning rods.
Our preselectors are available in a wide range of frequency splits, bandwidth and cavity sizes.
• Temperature compensation: ensures frequency stability
• High attenuation: minimizes desense and interference from adjacent systems
Other preselectors are also available. They include comblines and our full line of cavity-based preselectors. Sizes range from the very compact 1” helical filter to the very selective 6.625” cavity preselector. Please contact a technical support technician for consultation.
Specify working frequency, bandwidth, power and isolation required