Nautel XL12, Technical Instructions

Page: 190 / 238

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Page 9-1
01 January 2002
SECTION 9
ELECTRICAL SCHEMATICS
INTRODUCTION
9.1
This section contains electrical schematics/
logic diagrams for the subject equipment. Block
diagrams, simplified electrical schematics and/or
logic diagrams may be included. Refer to table 9-1
for an itemized listing.
COMPONENT VALUES
9.2
Unless otherwise specified on the logic/
schematic diagram:
- Resistor values are shown in ohms.
(K = 1 000 and M = 1 000 000).
- Capacitor values are shown in microfarads (uF).
- Unidentified diodes are part number 1N4938.
GRAPHIC SYMBOLS
9.3
The graphic symbols used on electrical
schematics are in accordance with American
National Standard ANSI Y32.2-1975 - Graphic
Symbols for Electrical and Electronic Diagrams.
LOGIC SYMBOLS
9.4
The logic symbols used on electrical
schematics and logic diagrams are in accordance
with American National Standard ANSI Y32-.14-1-
975 - Graphic Symbols for Logic Diagrams.
REFERENCE DESIGNATIONS
9.5
Reference designations were assigned in
accordance with American National Standard ANSI
Y32.-16-1975 - Reference Designations for
Electrical and Electronic Parts and Equipments.
Each electrical symbol has been identified with its
basic reference designation. To obtain the full
reference designation for a specific part, this basic
identifier must be prefixed with the reference
designation assigned to all higher assemblies.
UNIQUE SYMBOLOGY
9.6
Nautel utilizes unique symbology on
electrical schematics to describe two-state (logic)
inputs/outputs which differ from those inputs/outputs
having only one distinct state or multiple states
(analog).
9.6.1 TYPE OF INPUTS/OUTPUTS:
On
electrical schematics, names used to describe two-
state (logic) inputs/outputs are prefixed by a '#'.
Those inputs/outputs representing a one-state or
analog signal will have no prefix.
9.6.2 LOGIC LEVEL/CONVENTION:
The
'#' prefix identifies an input/output that has two
distinct states - 'high' and 'low'. A suffix, '+' or '-',
identifies the active (true) state of the input/ output.
The 'high' (+) will be the more positive of the two
levels used to represent the logic states. The 'low' (-
) will be the less positive of the two levels used to
represent the logic states. Two types of logic,
positive and negative, may be represented on a
particular schematic. In positive logic, a 'high'
represents the active (true) state and a 'low'
represents the inactive (false) state. In negative
logic, a 'low' represents the active state and a 'high'
represents the inactive state.
IDENTIFICATION OF SCHEMATIC
DIAGRAMS
9.7
Each illustration in this section is identified by
a number that is both the figure number and the page
number. The numbers are assigned sequentially and
are prefixed by the letters 'SD-'. The electrical
schematics/logic diagrams included in this section are
listed in table 9-1.
STRUCTURE OF SCHEMATICS
9.8
The electrical schematics have been
structured in a hierarchical format that is based on
function and signal flow. Wherever practical, the
signal flow is from left to right. Inputs will normally
originate on the left-hand side and outputs will be
extended to the right-hand side. Exceptions will be
indicated by an arrow indicating the direction of
signal flow.