Repeater

A repeater is a combination of a receiver and a transmitter that receives a signal and retransmits it, so that signals can cover longer distances. A repeater sited at a high elevation can allow two stations, otherwise out of line-of-sight propagation range of each other, to communicate. In addition to amateur radio, repeaters are used in commercial and government mobile radio systems.

The repeater receives on one radio frequency (the "input" frequency), demodulates the signal, and simultaneously re-transmits the information on its "output" frequency. (When a single frequency is given for a repeater, it is the output frequency.) All stations using the repeater transmit on the repeater's input frequency and receive on its output frequency. Since the repeater is usually located at an elevation higher than the other radios using it, their range is greatly extended.

Because the transmitter and receiver are on at the same time, isolation must exist to keep the repeater's own transmitter from degrading the repeater receiver. If the repeater transmitter and receiver are not isolated well, the repeater's own transmitter desensitizes the repeater receiver. The problem is similar to being at a rock concert and not being able to hear the weak signal of a conversation over the much stronger signal of the band. Typically, repeaters use sets of filters (called duplexers) to avoid this.

List

PBARC Repeaters

• Harbor Hills repeater (146.960 MHz, - offset, 88.5 Hz tone)
• Crown Terrace repeater (146.840 MHz, - offset, 88.5 Hz tone)

Other Repeaters

• Bosley Butte repeater (147.250 MHz, + offset, 88.5 Hz tone)
• Crescent City repeater (146.880 MHz, - offset, 136.5 Hz tone)
• Camp Six repeater (147.180 MHz, + offset, 136.5 Hz tone)
• Template:K6JR