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146 Handbook of Intercom Systems Engineering
Relay Frame. The relay feature also works with the 8 GPI outputs of an ADAM™, ADAM™ CS,
or Zeus™ intercom system (J27 on a Zeus™ Frame, J903 on an ADAM™ CS Frame, and J11 on
the XCP-ADAM™-MC Master Controller Breakout Panel in an ADAM™ Intercom System).
You can assign a keypanel key to control a GPI output from any of these devices, and then use
that key and output to control an external device. For example: you could use a keypanel key to
control lighting. Or, you could assign a relay as a level 2 talk key assignment in a stacked talk key
arrangement to both send audio and key a device, such as a paging amplifier or a 2-way radio.
Remote Station
A user station located at a distance from the master station.
Remote Truck,
Remote Unit
A mobile television studio. Supports television productions with equipment and production
personnel operating positions. Carries cameras, CCUs, switcher, monitors, audio console and
ancillary equipment, VTRs, and last, but not least, intercom systems.
Resistance
In DC circuits, the opposition to current, in AC circuits, the real part of the opposition to current.
Resonance
A condition where an applied signal’s frequency coincides with a natural response frequency of a
circuit, device, or system. There must be reactances in the circuit for a resonance, a pure
resistance doesn’t resonate.
Retractile
A cord whose jacket is treated and formed to retract as a spring.
RF
Radio Frequency. Frequencies generally ranging from 15 kilohertz to 150 gigahertz. The
electrical energy at these frequencies is often converted to electromagnetic waves that are
propagated through space. These waves are the basis of the wireless intercom, radio broadcasting,
television broadcasting, microwave ovens, industrial processes. Frequency Name of Band
Examples: 3 to 30 kilohertz Very Low Frequencies (VLF) Underwater Communications 30 to
300 kilohertz Low Frequency (LF) Navigation 300 to 300 kilohertz Medium Frequency (MF) AM
Radio Broadcasting 3 to 30 megahertz High Frequency (HP) Short Wave Radio, Long Range
Terrestrial Communications 30 to 300 megahertz Very High Frequency (VHF) TV, PM
Broadcast, Fixed I Mobile Communications, Walkie Talkie, Wireless IFB, Wireless Intercom,
Airborne Communications 300 to 300 megahertz Ultra High Frequency (UHF) TV Broadcast,
Mobile Communications, Walkie Talkie, 3 to 30 gigahertz Super High Frequency (SHF) Satellite
Uplink/Downlink 30 to 300 gigahertz Extremely High Frequency (EHF) Satellite Uplink/
Downlink kilohertz = 1000 hertz megahertz = 1000000 hertz gigahertz = 1000000000 hertz
RFI
Radio Frequency Interference. This interference may originate from AM and FM radio stations,
television stations, light dimmers, electric motors, intermittent incandescent or fluorescent lamps,
doorbells, et cetera. It results in either direct demodulation into audio circuits or position sensitive
effects.
RMS
The abbreviation for root-mean-square. The effective value of an alternating current waveform.
The root-mean-square current, power, or voltage is as follows: Square the amplitude, so that the
positive and negative halves of a waveform are the same polarity. Then the value is averaged over
time. Finally the square root of the average or mean is taken. The RMS value of a one volt peak
sine wave is 0.707
Roll-off
The frequency at which the response of a filter, circuit, network, device, or system changes from
its center value by 3 dB.
RU
See Rack Unit(s).
S
SA or S.A.
Stage Announce. A public address system originating in a control room and ending up on the
stage. The SA may also have the functionality of an IFB. This allows the director to interrupt
dance music and address the dancers. The SA function is a standard function on the Series 4000
IFB system, the Model 801 / Model 860 system, and the Model 802/ Model 862 system. The SA
function is available as a special option on almost any RTS™ Systems user station. In the option
case, the SA does not necessarily include the IFB function. An IFB option has to ordered to assure
IFB functionality.
Semiconductor
A material whose conductivity falls between a conductor and an insulator. Semiconductors
include the elements carbon, silicon, and germanium in crystal form. Other semiconductors