Item Details:
Telewave TWPC-2208 Bandpass Cavity Filters
The Telewave TWPC-2208-1 and TWPC-2208-2 are 8-inch diameter, quarter-wavelength high-Q bandpass cavity filters for 200–300 MHz, offering excellent selectivity. They suppress transmitter sideband noise and prevent receiver desensitization.
Factory-tuned to the specified frequency, these cavities require no initial adjustment. A positive locking mechanism enables fast field retuning if needed.
Adjustable coupling allows insertion loss to be set from 0.5 dB to 2 dB (or higher) for optimized selectivity. The TWPC-2208-2 provides greater selectivity with minimal loss at crowded sites. Multiple cavities can be combined for wider passbands; mounting rails are included for multi-cavity assemblies.
Temperature stability (-30°C to +70°C) is ensured by a machined Invar rod compensator. Telewave Ground Loop technology grounds each coupling loop at DC for lightning protection and noise reduction. Constructed from heavy-duty materials: ¼-inch aluminum top plates heliarc-welded to the body, silver-plated tuners, beryllium copper finger stock, and rigid foam supports for vertical or horizontal mounting. Alodined aluminum prevents galvanic corrosion. Power handling reaches 350 W (depending on insertion loss), delivering reliable long-term 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): |
8 x 18 inch (20 x 46 cm) |
| Connectors: |
N or UHF female (opt.) |
| Finish: |
Gray acrylic enamel |
Telewave-TWPC-2208-1-2-bandpass-cavity.pdf (106.27 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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