Helios Junior, User’s guide
02/2008
Page 38
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RF (Radio Frequency)
Wave carrier modulated by an AF signal (in FM, this AF signal is usually a Multiplex signal).
ROM (Read Only Memory)
ROM is a storing circuit that contains the software. (ROM cannot be overwritten)
RS232 (Recommended Standard 232)
Third version (RS-232-C) of the serial port transmission standard in computers.
TCP/IP (Transmission Control Protocol / Internet Protocol)
These two protocols have been developed to enable computers to communicate on networks. IP
performs data packages transference, TCP checks correct client/server communication. TCP/IP is the
basis of the internet and is available on every common operating system.
TFT (Thin-Film Transistor)
Technology applied to design LCD screens usually used on laptop computers. TFT screens are more
bright and readable than LCD screens.
VCO
Voltage Controlled Oscillator.
VSWR (Voltage Standing Wave Ratio)
Ratio between RF power (transmitter) really transmitted, and the non-transmitted power reflected to the
transmitter. This reflected power must be as small as possible, to avoid transmitter damage. Too high
VSWR usually causes a controlled decrease of the output RF power, launching a VSWR alarm.
Summary of Contents for HELIOS JUNIOR
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