Manual

30
Abbreviations
Names often used on UHF LRS pages and when talking about radio control and video links and FPV.
RC - Radio Control, remote wireless control of something
RC unit - The radio control unit you hold in your hand, can be a Futaba, JR, Graupner, Multiplex and so on
Servo - when connected to rudders/ailerons/elevator they steer a plane.
Servo pulse - is a digital pulse width that hold position information, 1.5mS is centre position.
LRS - Long Range System, often a short for my system, sometimes also called UHF LRS
UHF - Ultra Height Frequencies, is 300-3000MHz, but radio amateurs often call UHF = 70CM band, also
known as the 430-470MHz area
TX - Transmitter used to transfer a signal to a receiver
RX - Receiver used to receive the radio signal and output the signals, pulses, audio, video, data
RC RX - Radio control receiver, can be any type any brand and any coding system, they all output standard
servo pulses
LRS TX - the metal box containing the 500mW transmitter used for my long range system.
LRS RX - the receiver located in the plane, this receiver is connected directly to servos and 5V supply
RSSI - received signal strength indication, is often an analogue voltage that goes up or down depending of
radio signal level in a receiver
Video TX - Video transmitter, located on a plane, car, boat, helicopter or whatever, often using 900-1300-
2400MHz
Video RX - Video receiver, located on ground, when connected to a TV screen you can see live pictures
from the Video TX
Video Splitter - is an amplifier that will allow the user to distribute a video signal to several things at the
same time.
PPM - Pulse Period Modulation, is the pulse system used in trainer/student systems, it contain high
resolution information’s on all servo positions assigned.
PPM inverted - the pulse can be normal or inverted, some older systems do not handle both when
connected as student/trainer
LOS - Line Of Sight, is the distance from ground to a plane with nothing in the way, not even ground.
Long Range - is normally not defined, but when a plane is not visible by direct sight it is normally called long
range