The narrowband AB772B1183 cavity band-pass filter is designed for use in public safety mobile radio systems. It has a center frequency of 772 MHz, pass-band of 769 to 775 MHz, insertion loss of 2 dB, rejection of 40 dB at 700 kHz from band edges, ripple of less than 0.2 dB, and return loss of at least 14 dB.