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11-65-26, 406-420 MHz, Bandpass Cavity Filter passes one narrow band of frequencies and attenuates all others with increasing attenuation above and below the pass frequency. It is equivalent to a parallel-tuned circuit and is most often used for general transmitter spurious clean-up or a sharpening of a single receiver front end selectivity with or without amplification. TX RX bandpass cavities (4", 6" and 10") have adjustable selectivity characteristics (rotatable loops) to allow a trade-off between insertion loss (0.5-3.0 dB) and selectivity. Maximum power handling is typically determined by insertion loss setting.

  • Various Low-Loss High-Rejection Models to choose from.
  • All Loop Plate/connector assemblies are silver-or Alballoy®-plated for low IM.
  • Welded cavity construction and silver-plated tunable probe and loops give superior pass and reject characteristics.



Product Specifications 
Item No11-65-26 Series
Item Name406-420 MHz, Bandpass Cavity Filters
Frequency Range406-420 MHz
Max Power per Cavity270 W, per cavity @ 0.5 dB IL
60W, per cavity @ 3.0 dB IL
Impedance Ω50
VSWR1.25:1 max.
Cavity Length - Electrical3/4λ
Temperature Range-30 to +60 °C
Cavity Diameter10"
Number of Cavities2
Dimensions H x W x D
26" x 10" x 10"
(660.4 x 254.0 x 254.0 mm)
Shipping Weight43 lbs.


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Cavity Filter Loop Kits