Telewave Inc TWPC-4505-3

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Telewave TWPC-4505 Bandpass Cavity Filters

Telewave TWPC-4505-1, -2, and -3 are 5” diameter, ¾-wavelength high-Q bandpass cavity filters with excellent selectivity. They pass a narrow frequency band (400-512 MHz) while rejecting others, suppressing transmitter sideband noise and preventing receiver desensitization.

Factory-tuned with a positive locking mechanism for easy field retuning if needed. Adjustable coupling sets insertion loss from 0.5 dB to 2+ dB for optimized selectivity. The -2 and -3 models offer superior performance with minimal loss at crowded sites; multiple units can widen the passband. Mounting rails included for multi-cavity setups. Temperature-stable (-30°C to +70°C) via machined compensator and Invar rod. Ground Loop design grounds coupling loops at DC for lightning protection and noise reduction.

Built for durability: ¼-inch aluminum top plates heliarc-welded to body, handling up to 350 W (depending on loss). Rigid foam supports tuner for any orientation; similar metals and alodined finish prevent corrosion. Silver-plated tuners and beryllium copper contacts ensure low-loss, reliable long-term operation.

Specifications:

Tuning range:	400-512 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:	¾ 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 23.5 inch (13 x 60 cm)
Connectors:	N or UHF female (opt.)
Finish:	Gray acrylic enamel



Note:

For detailed specifications on this item, download Telewave Large Product Brochure (the link is below). Bulky items may incur higher shipping charges, please inquire before ordering.

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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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