Solid Signal > Tools and Installer Supplies > Attenuators and Terminators > Telewave TWPC-4508-1
The Telewave Bandpass Cavity Filter 406-512 MHz, is dual 5" diameter, ¼-wavelength, high "Q" bandpass cavity filter with superior selectivity. The bandpass cavity rejects all frequencies outside a narrow passband. The cavity reduces transmitter sideband noise and also protects receivers against desensitization.
The cavity is tuned to specified frequencies prior to shipping, and no further adjustments should be required. The positive locking mechanism allows for quick field retuning if frequency changes become necessary. The cavity also features calibrated adjustable coupling, and insertion loss can be easily set from 1 dB to 4 dB or more to improve selectivity. This allows cavity response to be optimized for any operating environment. At densely populated sites, the 1505-2 cavity filters provide greater selectivity with minimum insertion loss. Multiple cavities can also provide a wider passband when required. Mounting rails are provided for all multiple-cavity filters.
Excellent frequency stability is achieved by the use of a specially machined compensator and Invar rod. The pass frequency is temperature stable from -30°C to +70°C. Telewave Ground Loop technology places the center conductor of each coupling loop at DC ground potential for lightning protection and noise reduction. Heavy-duty materials are used throughout each cavity to ensure high performance and long life. Cavity top plates are machined from ¼ -inch aluminum and are heliarc welded to the cavity body at the high current point for improved conductivity and strength. This allows the cavity to handle up to 350 watts, depending on insertion loss.
Rigid foam inserts support the tuner assembly allowing vertical or horizontal mounting. Similar metals and alodined aluminum help prevent galvanic corrosion. Silver plated tuners and beryllium copper finger stock provide non-corrosive low loss contact and ensure reliable, long-term performance.
- Rejects all frequencies outside a narrow pass band
- Reduces transmitter sideband noise, and also protects receivers against desensitization
- Provides greater selectivity with minimum insertion loss
- Machined compensator and invar rod ensures excellent frequency stability
- Frequency Range: 406-512 MHz
- Number of Cavities: 1
- Cavity Size: 8"
- Input Power (Max): 350 W
- VSWR: 1.5:1
- Insertion Loss Range: 0.3-2.0 dB
- RF Connectors: N-Female
- Dimensions: 17" x 8" x 8"
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