VAL AVIONICS LTD
VAL AVIONICS LTD
VAL AVIONICS LTD
VAL AVIONICS LTD
AWOS 2000
AWOS 2000
AWOS 2000
AWOS 2000 –
–
–
– VHF TRANSMITTER
VHF TRANSMITTER
VHF TRANSMITTER
VHF TRANSMITTER
MAINTENCE AND REPAIR MANUAL
MAINTENCE AND REPAIR MANUAL
MAINTENCE AND REPAIR MANUAL
MAINTENCE AND REPAIR MANUAL
Revision 1
Page 4 of 13
April 2012
1.2.1 Main Board
Assembly
The main board assembly
contains the microcontroller,
power supply, audio circuitry
and RF TX generator.
1.2.1.1 Microcontroller
This board contains a microchip
PIC16F818 microcontroller
featuring 1kB of EEPROM
memory running at 8MHz.
Other circuits on the board are
used for input/output functions
such as controlling the
frequency and controlling the
transmitter boards.
The block diagram in Figure 2
below shows the interaction
between the various main
board circuits.
Main
Transmitter
J3 / X1 / X3 / X5
XMIT LO
RF Connector
J4 – DB9 Connector
Figure 1: AWOS 2000 Block Diagram
