TELEWAVE's TWPC-1405-2 118 – 148 MHz dual-bandpass cavity filter. The Telewave TWPC-1405-2 is a 118-148 MHz 5 in diameter, 1/4 wavelength, high "Q" bandpass cavity filters with superior selectivity. Bandpass cavities reject all frequencies outside a narrow passband. These cavities reduce transmitter sideband noise, and also protect receivers against desensitization. The insertion loss is 1.0 – 4.0 dB. Please specify exact operating frequency.