Item Details:
Telewave TWPC-8604 Bandpass Cavity Filters
The Telewave TWPC-8604-1 is a 4-inch diameter, quarter-wave high-Q bandpass cavity filter with superior selectivity, designed to pass a narrow frequency band while rejecting all others. It reduces transmitter sideband noise and protects receivers from desensitization.
The cavity covers 806 to 960 MHz and is factory-tuned to the specified frequency, requiring no further adjustments, though a positive locking mechanism allows quick field retuning if needed. It features calibrated adjustable coupling, with insertion loss easily set from 0.5 dB to 2 dB or higher to optimize selectivity for any operating environment.
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 plates heliarc-welded to the body at the high current point, 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, depending on insertion loss.
Specifications:
| Tuning range: |
806-960 MHz |
| Nominal impedance: |
50 ohms |
| VSWR at resonance (max): |
1.5:1 |
| Input power (max) vs. insertion loss: |
0.5 dB - 350 watts
1 dB - 250 watts
2 dB - 150 watts |
| 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 |
| Connectors: |
N or UHF female (opt.) |
| Finish: |
Gray acrylic enamel |
Telewave-TWPC-8604-1-bandpass-cavity.pdf (117.67 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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