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Helios 20, 50 or 100 W, User Manual – 01/2011
Page 125
I²C
The I²C bus enables connection between electrical components using two channels; data is transmitted in
the first channel (SDA), and the clock data checking on the second one (SCL).
IP (Internet Protocol)
See TCP/IP
IRAC (standard)
International Radiocommunications Advisory Committee
LCD (Liquid Crystal Display)
Liquid Crystal Display technology offers diversified solutions for most applications, such as low
consumption, excellent readability and long-lasting. In essence, it is an electrically reactive substance
between two electrodes which darkens or brightens in response to power supplied to electrodes.
LF (Low Frequency)
Signals used for modulation of an RF carrier. MPX is an LF signal composed of other LF signals.
MOS-FET (Metal Oxide Semiconductor-Field Effect Transistor)
Technology used in RF power transistors.
MPX (Multiplex)
Different low-frequency components that modulate RF carrier. Multiplex extends on a 100 kHz bandwidth.
Content changes on transmission mode and related data to transmit. Consists of at least audio data (left
channel in monaural, or both left and right channels in stereophonic), normally RDS, and sometimes
DARC.
PCB (Printed Circuit Board)
Printed circuit that enables electronic components assembly. PCB can be single faced, double faced or
multilayer, made of epoxy glass (FR4), Teflon (PTFE) or composite, with metal holes.
PDF (Portable Document Format)
Document format created by Adobe that enables reading and printing a document on any platform, using
Acrobat Reader.
PLCC (Plastic Leaded Chip Carrier)
CMS integrated circuit case with I-clips on four sides. Some circuits are located on a socket, to be easily
removed using specific PLCC extraction pliers.
PLL (Phase Locked Loop)
The Phase Locked Loop is the part of an oscillator set used to supply a given carrier frequency, that could
be modified (ex: between 87.5 and 108 MHz). Made from a stable frequency reference.
Preemphasis
Its purpose is to increase the high frequency range, in order to maintain the corresponding signal over
noise. Preemphasis is usually expressed using a time constant. When received, a de-emphasis cell
performs the reversed operation to recover the original range of the signal.
RAM (Random Access Memory)
RAM is used for temporary data storage, during the time the microprocessor processes information.
RC/RM
Feature included in our RC/RM extension cards, enabling device monitoring and information regarding
alarms and operation mode.
RDS (Radio Data System)
Digital data associated to a radio channel. Most of FM transmitted radio channels use this data that
enables radio identification and automatic change during movement.
Summary of Contents for HELIOS 100W
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