Item Details:
Telewave TWNC-7604 Notch Cavity Filters
The Telewave.io TWNC-7604-1 is a 4-inch diameter, quarter-wave notch cavity with an adjustable coupling loop, designed to reject a specific frequency when used with pass or pass/reject cavities. It provides very low loss outside the notch band and can have its notch response tilted to position the notch close to a pass frequency without affecting performance.
The cavity covers 763 to 869 MHz and is factory-tuned to the specified frequency, requiring no further adjustments, though a positive locking mechanism allows quick field retuning if needed. The adjustable coupling is calibrated for easy optimization of selectivity in any operating environment. At sites with high interference, a dual-cavity configuration increases selectivity while keeping insertion loss minimal, and multiple cavities can create a wider notch when necessary. Mounting rails are included for all multi-cavity filters.
Frequency stability is maintained across -30°C to +70°C using a machined compensator and Invar rod. Telewave Ground Loop technology grounds the center conductor of each coupling loop at DC potential for lightning protection and noise reduction.
The cavity is built with heavy-duty materials, including quarter-inch aluminum top and bottom plates heliarc-welded to the body, silver-plated tuners, beryllium copper finger stock, and alodined aluminum to prevent corrosion and ensure reliable long-term performance. It handles up to 350 watts continuously.
Specifications:
| Tuning range: |
763-869 MHz |
| Nominal impedance: |
50 ohms |
| VSWR at resonance (max): |
1.5:1 |
| Temperature range: |
-22°F to +158°F
-30°C to +70°C |
| Cavity electrical length: |
¼ wavelength |
| Outer conductor, end plates: |
6061-T6 aluminum |
| Inner conductor, coupling loops: |
Silver plated copper |
| Tuning rod: |
Invar |
| Contactors, fingerstock: |
Beryllium copper |
| Cavity dimensions (Diam. x H): |
4 x 6 inch (10.2 x 15.2 cm) |
| Connectors: |
N female |
| Finish: |
Gray acrylic enamel |
Telewave-TWNC-7604-notch-cavity.pdf (113.76 KB)
Telewave Inc. designs and manufactures high quality RF system products. It serves wireless system operators, public safety providers, local and state governments, and federal agencies in the United States and internationally. The company was founded in 1972 and is based in San Jose, California. Telewave strives to be the premier supplier of seamless interoperable communication systems that provide security and reliability in mission critical eco-systems for both commercial and military applications worldwide. Telewave products are used by more than 7,500 equipment and network manufacturers and government agencies throughout the world.
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