User's Manual

Heli-Coder 4 Transmitter Operation Manual | Doc. No. 6051452100 Rev. B1
Broadcast Microwave Services, Inc. 23
14 GLOSSARY
Analog Transmission Frequency Modulated (FM) method of sending information with radio waves.
An older, dependable method of transmission. (See Digital Transmission)
Antenna Actuator The mechanism which deploys or retracts the antenna radio operation or for
landing and take-off.
ASI: Asynchronous Serial
Interface.
Transmission standard used to connect video delivery equipment within a
cable, satellite or terrestrial plant.
BNC Connector The Bayonet Neill-Concelman connector is a type of RF connector used for
terminating coaxial cable. (See TNC connector)
COFDM: Coded Orthogonal
Frequency Division Multiplex
A digital modulation method that divides a single digital signal across multiple
(1000+) signal carriers simultaneously. BMS Coder II family products use
COFDM digital modulation.
Composite Video The format of an analog television (picture only) signal before it is combined
with a sound signal and modulated onto an RF carrier.
CVIII Carry-Viewer™ III Handheld Receiver Microwave downlink receiver with color
monitor
CVIII+
Carry-Viewer™ III+ (includes Geo-Point) Handheld Receiver Microwave
downlink receiver with color monitor
Data Wayside The data side channel on a microwave downlink
dB: Decibel A unit for expressing the ratio of two amounts of electric or acoustic signal
power equal to 10 times the common logarithm of this ratio.
dBm A unit for expressing the power ratio in decibel (dB) of the measured power
referenced to one milliwatt (mW).
Digital Transmission Digitally Modulated (COFDM and others) method of sending information with
radio waves. Newer more reliable method of transmission. (See Analog
Transmission)
Directional Antenna The final transmit element of a microwave system that radiates the signal one
direction, in a directed or focused narrow beam. This requires aiming of the
antenna toward the receive site.
DVB-T: Digital Video
Broadcasting-Terrestrial
An international digital television (DTV) standard that defines digital COFDM
modulation using MPEG2 compression.
DO-160 RTSC standard; Environmental Conditions and Test Procedures for Airborne
Equipment
Downlink Microwave transmission from air to ground
Geo-Point BMS Proprietary direction and ranging system
GPS: Global Positioning
System
A navigational system using satellite signals to fix the location of a receiver on
or above the earth’s surface
MPEG-2 A compression standard for digital video, audio, and data
H.264 A compression standard for digital video, audio, and data conforming to
MPEG-4, Section 10 AVC (Advanced Compression Standard)
HD-SDI High Definition Serial Digital Interface - A digitized video format for high
definition video
KLV Key Length Value. A method of encoding data into video streams. Defined in
standard SMPTE 336M-2007
Multipath The radio wave propagation phenomenon that results in the transmitted signals
ft. reaching the receiving antenna by two or more paths. This condition is not
desirable and usually results in signal fading and interference.