Takes and audio input, encodes it onto an RF carrier signal and transmits it.
Receives RF signals, decodes the audio signal and routes it to an output.
Maximizes reception of RF signals. Normally tuned to a work with a particular frequency range.
Omni directional, single polarization antenna.
LPDA (aka Fin)
Directional, single polarization antenna.
Very directional antenna with circular polarization to minimize dropouts.
In Ear Monitor. A system that uses a Tx and Rx unit to send audio to a performer. IEM systems are typically non-diversity and mono.
A handheld or belt pack Tx unit which embeds audio from an integrated mic capsule or plug in mic.
RF over Fiber allows RF signals to be sent down a fiber cable dramatically increasing range and eliminating signal loss.
Copper cable with a 50 Ohm impedance used to connect RF components together. All Co-Ax cables exhibit signal loss over distance. Signal loss is higher at higher frequencies. For example, a cable that exhibits an 8db loss over 100ft at 400Mhz would exhibit a 16db loss over the same distance at 800Mhz. Co-Ax cable is specified in RG numbers. The higher the number the lower the signal loss over distance.
Bayonet Neill-Concelman the standard connector for RF system components. The BNC connector features two locating pins and requires a 90dg turn to fully seat or undo.
The use of 2 antennas to maximize RF signal to an Rx unit. There are two basic types Diversity and True Diversity. Diversity places the signal detection circuit after the antenna and before the receiver and sends the strongest antenna signal to the receiver. True Diversity uses two antenna and receiver sets and the detection circuit chooses the best audio signal rather than the best RF signal.
Sums multiple sets of diversity antennas to one set of outputs. This allows RF signal to be picked up across many zones.
Diversity antenna system but with four antenna/receiver sets instead of two.
When the RF signal fails to reach the Rx unit with sufficient strength.
Ultra High Frequency, typically 470-698 MHz
Very High Frequency, typically 169-217 MHz
Licensed frequency band, typically 940-960 MHz
Gaps in between DTV signals
Captures all the RF signals in an environment. Provides a baseline for frequency coordination.
Decibles in relation to Isotropic antennas
Decibels in relation to Dipole antennas
VSWR (Voltage Standing Wave Ratio)
A measure of how efficiently radio-frequency power is transmitted from a power source, through a transmission line, into a load(Antenna). Values go from 1 to infinity. The lower the number the better.
The loss of energy reflected back from the load(Antenna). Higher loss indicates that the load is absorbing the energy and not reflecting it back. Higher loss is good.
LPDA (aka Fin)
Log-Periodic Dipole Array
Intermodulation Analysis System
Software Defined Radio
License and Management System
Special Temporary Authority
Studio Transmission Link - (944 - 952MHz)
Society of Broadcast Engineers
Consolidated Database System
Universal Licensing System
Land Mobile Radio
Downlink and Uplink Blocks A-G in Spectrum (Includes Duplex Gap)