Helios Junior, User’s guide
02/2008
Page 36
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GLOSSARY
AF (Audio Frequency)
For radio transmission, the functioning radio channel (voice or music), to be used for modulation of an FM
carrier. In FM transmission, the bandwidth of a radio signal extends from 40Hz to 15kHz.
AM (Amplitude Modulation)
ART (Autorité de Régulation des Télécommunications)
French telecommunication regulator.
Baud
Unit that expresses the number of modulations per second that can be assimilated at a given speed, it
measures data transfer (same as bps: bit per second) usually used in modems.
BLU
Single lateral band.
CAN (Control Area Network)
"
Industrial
"
communication bus not sensible to electromagnetic disturbance, vibrations or temperature.
Very often used for motor vehicles.
CE (standard)
Compulsory standard regarding devices sold in the European Community. The CE standard indicates that
the supplier guarantees for the device all electrical safety and electromagnetic compatibility.
DARC (DAta Radio Channel)
Digital data of radio channel, with a higher ratio than RDS.
Deviation
Value of the frequency gap of the wave carrier in presence of an LF signal, compared to the frequency of
this wave carrier when there is no LF signal. (In France, deviation value cannot exceed 75kHz.)
Distortion
Signal distortion during processing, transmission or return. There are different kinds of distortion: linear,
non-linear, phase distortion, etc.
EMC (ElectroMagnetic Compatibility)
Feature of a device that operates efficiently in its electromagnetic environment. EMC implies that the
device does not cause disturbance signals, is isolated from external disturbance and is protected against
electrostatic surges.
ESD (ElectroStatic Discharge)
Electrostatic discharge that can reach 4000 Volts. Non-protected electrical components will be damaged,
if compulsory ANTI-ESD procedures, during maintenance or card repair are not followed (bracelet,
binding and antistatic smock).
FM (Frequency Modulation)
Frequency carrier changes of the FM transmitter following changes of the modulation AF signal. Value of
variation depends directly on signal modulation range.
HF (High Frequency)
See RF.
Hyperfrequency
All frequencies over 1,2 GHz.
Summary of Contents for HELIOS JUNIOR
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