Telewave Introduces Notch Cavity Filters That Eliminate Unwanted Frequencies with Low Insertion Loss

The TWNC-1510 single and dual Notch Cavities are 50 Ohm cavities with either N-type or UHF female RF ports. These cavities feature VSWR ratings of 1.5:1 across the entire 148 MHz to 174 MHz tuning frequency range, and to 350 Watts of RF input power. Single cavity filter attenuations of nearly -20 dB are available, with dual cavities capable of nearly -40 dB of attenuation. Telewave Notch Cavities can also be combined in multi-cavity assemblies for wider notch bandwidth, with mounting rails included. All Telewave Notch Cavities are factory tuned to customer specifications, and should not require additional adjustments.

Telewave’s Notch Cavities are often used alongside Pass or Pass/Reject Cavities to eliminate a specific undesirable frequency. To facilitate this, the TWNC-1510 series of Notch Cavities is designed to exhibit very low loss outside of the notch band, which limits any degradation to desired signal transmission. Depending upon customer needs, Telewave is even able to adjust the Notch Cavity response very close to a passband frequency without additionally attenuating passband signals. A positive locking mechanism is included to enable quick field re-tuning if frequency plan changes occur, which prevents obsolescence and costly equipment replacement or factory servicing. Furthermore, the frequency response of these Notch Cavities can be optimized for any operating environment by calibrating the selectivity through an adjustable coupling.

The TWNC-1510 series are precision designed 10” diameter, ¼-wavelength Notch Cavities with several high quality manufacturing features to ensure long life and high performance in a wide range of environments. These Notch Cavities incorporate specially machined compensator and invar rods to ensure…

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