Specifications

xviii 888-2857-001 5/9/13
WARNING: Disconnect primary power prior to servicing.
PS (Power supply):
A device that supplies DC electrical energy to one or more electric loads, typically
via the rectification of an AC mains electrical input.
RF (Radio frequency):
An electrical oscillation at the frequency of radio waves in the range of 3 kHz to 300
GHz. In this application, typically a signal in the 168 MHz to 242 MHz frequency
range of the VAX transmitter.
RS-485:
A TIA/EIA standard for serial multipoint communications lines. The signal
communication protocol used for serial communications between various
subassemblies in the transmitter system. Also known as EIA-485 or TIA-485.
RTAC (Real Time Adaptive Correction):
A signal processing technique applied in the modulator signal generation stage
which seeks to correct deficiencies in the high power amplification and filtering
stages by means of complementary pre-distortion.
RU:
An abbreviation for rack unit.One rack unit equals 1.75" (44.45mm). The rack unit
is used to describe the height of components that will be placed in racks.
SFN (Single Frequency Network):
A transmission network in which all transmitters are synchronized in frequency and
phase (symbol). This transmission technique guarantees high frequency economy,
as a single frequency can be used in a large geographic area.
SMA (SMA connector):
A coaxial connector for RF cables featuring a 0.250 x 36 thread and a .312 inch
(7.925mm) hex nut in the male connector.
SMPTE (SMPTE 310 transport stream):
A transport stream format sometimes employed with the ATSC digital television
standard.