The Telewave TWPC-4510-1 is a 10 in diameter, 1/4 wavelength, high "Q" bandpass cavity filter with superior selectivity. Bandpass cavities reject all frequencies outside a narrow passband. These cavities reduce transmitter sideband noise, and also protect receivers against desensitization. TWPC-4510 cavities cover 400 – 512 MHz. All cavities are 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. These cavities also feature calibrated adjustable coupling, and insertion loss can be easily set from 0.5 dB – 2 dB or more to improve selectivity. This allows cavity response to be optimized for any operating environment. At densely populated sites, the 4510-2 cavity filter provides 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.