UHF Analog Driver/Transmitter/
Chapter 4, Circuit Descriptions
Translator
LX Series, Rev. 3
4-19
With the LED control line HIGH, the
MOSFET is On, which causes the base of
the transistor go toward ground
potential, reverse biasing the transistor.
With the transistor reverse biased, no
current through the transistor and LED,
therefore the effected LED will not light.
A third color, amber, can also be
generated by having both transistors
conducting, both control lines LOW. The
amber color is produced because the
current applied to the green element is
slightly greater than the red element.
This occurs because the current limiting
resistors have a smaller ohmage value
in the green circuit.
There are four voltage regulators, three
for +5 VDC and one for +7 VDC, which
are used to power the Control Board.
+12 VDC is applied to U25 the +7 VDC
regulator that produces the +7 VDC,
which is applied to the LEDs mounted on
the board. The +7V is also connected to
the input of U26 a pre5.0 Volt
regulator. The +5.0 VDC regulator
output is used to power the analog
circuits and as the microcontroller
analog reference voltage. Another two
+5 Volt regulator circuits U27, +5V, and
U8, +5 Vserial, are used for most other
board circuits.
4.5.3 (A4) Switch Board (1527-1406;
Appendix B)
The switch board provides five front-
panel momentary contact switches for
user control and interface with the front-
panel LCD menu selections. The
switches, SW1 to SW5, complete the
circuit through connector J1 to
connector J2 that connects to J1 on (A5)
the 20 Character by 4 line LCD Display.
J1 on the switch board is also cabled to
the Control Board. When a switch is
closed, it connects a logic low to the
control board that supplies the
information from the selected source to
the display. By pushing the button
again, a different source is selected.
This occurs for each push button. Refer to
Chapter 3 Section 3.5.3, for more
information on the Display Menu Screens.
4.5.4 (A2) Switching Power Supply
Assembly
The power supply module contains a
switching power supply, an eight position
terminal block for distributing the DC
voltages, a three position terminal block
to which the AC Input connects. Jack J1
connects to the Control Board and
supplies DC OK, at J1-4 & 3, and AC OK,
at J1-2 & 1, status to the control board. A
Power Supply enable connects from the
control board to the power supply at V1-6
& 7. The power supply is configured for
three output vo12V, -12V, at the
8 position terminal block, and a main
output power of +32 VDC at J50 pin A (+)
and J50 pin B (Rtn). The power supply is
power factor corrected to .98 for optimum
efficiency and a decrease in energy
consumption. For safety purposes all
outputs are over voltage and over current
protected. This supply accepts input
voltages from 85 to 264 volts AC, but the
power entry module, for the
exciter/amplifier chassis, must be
switched to the proper input voltage
setting, for the transmitter to operate.
4.6 (A4) Power Amplifier Module
Assembly (1303770; Appendix B)
NOTE:
Used in 10W-100W Transmitters
or as a driver in systems above 2kW.
In a 1kW system, a 1303771 Driver PA
Assembly is used and in a 2kW system, a
1303874 Driver PA Assembly is used
The Power Amplifier Module Assembly
contains (A1) a 1 Watt UHF Amplifier
Module Assembly (1302891), (A2) a 40
Watt UHF Module Assembly (1304490),
(A3) UHF RF Module Pallet Assembly
(1300116), (A4) a Coupler Board
Assembly (1301949), (A5) an Amplifier
Control Board (1301962) and (A6) a
Temperature Sensor IC.
Содержание INNOVATOR
Страница 99: ...APPENDIX A LX SERIES ANALOG SYSTEM SPECIFICATIONS...
Страница 102: ...APPENDIX B DRAWINGS AND PARTS LISTS...
Страница 105: ...APPENDIX C TRANSMITTER LOG SHEET...
