Item Details:
Telewave TWPC-3505 Bandpass Cavity Filters
Telewave TWPC-3505-1, 3505-2, and 3505-3 are 5" diameter, ¼-wave high-Q bandpass cavity filters with superior selectivity. They pass a narrow 300–400 MHz band, rejecting all else to suppress transmitter sideband noise and protect receivers from desensitization.
Factory-tuned; no adjustments needed. Positive locking enables quick field retuning. Adjustable coupling sets insertion loss from 0.5 dB to >2 dB for optimized selectivity. The 3505-2 and 3505-3 deliver higher selectivity with minimal loss in crowded sites. Combine cavities for wider passbands; rails included.
Temperature-stable (-30°C to +70°C) via machined compensator and Invar rod. Ground Loop tech grounds loop centers for lightning protection and noise reduction.
Rugged build: ¼" aluminum top plates heliarc-welded at high-current points; handles up to 350 W (loss-dependent). Alodined aluminum, silver-plated tuners, and beryllium copper contacts prevent corrosion and ensure low-loss, reliable performance.
Specifications:
| Tuning range: |
200-300 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 |
| Cavity dimensions (Diam. x H): |
5 x 18 inch (13 x 46 cm) |
| Connectors: |
N or UHF female (opt.) |
| Finish: |
Gray acrylic enamel |
Telewave-TWPC-3505-1-2-3-bandpass-cavity.pdf (118.79 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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