Arizona GMRS Repeater Club FAQ

Here you can find answers to questions about how the board works. Use the links or search box below to find your way around.

Active Filter

A circuit that eliminates unwanted audio frequencies from the audio output of a receiver.


Automatic gain control (AGC; also called automatic voltage gain) is a closed-loop feedback regulating circuit, the purpose of which is to provide a controlled signal amplitude at its output, despite variation of the amplitude in the input signal. The average or peak output signal level is used to dynamically adjust the input-to-output gain to a suitable value, enabling the circuit to work satisfactorily with a greater range of input signal levels. It is used in most radio receivers to equalize the average volume (loudness) of different radio stations due to differences in received signal strength, as well as variations in a single station's radio signal due to fading.


American National Standards Institute


Attenuation affects the propagation of waves and signals in electrical circuits, in optical fibers, and in air (radio waves). Electrical attenuators and optical attenuators are commonly manufactured components in this field.


A circuit to reduce the sensitivity of a receiver in fixed steps measured in decibels.


The frequency range that a receiver is currently tuning or that a filter permits to pass through it.


The amount of frequency space occupied by a radio signal.

Base Loading

Placing a loading coil at the base of an antenna in order to lower the antenna’s resonant frequency.


Bidirectional Amplifier.

Beam Antenna

An outdoor antenna, usually mounted on a rotor, that concentrates more transmitter power (or receives better) in a certain direction.


The unmodulated output of a radio transmitter

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