Справочник Пользователя для Intercontinental Technologies Ltd F22-6D
Intercontinental Technologies, Ltd.
Chapter 12
Page 39 of 87
Chapter 12 Principles of Operation of Major Subcomponents
This Chapter provides an overview of the major functions of the F22 Series, including a description
of the transmitter, the receiver, and the major parts of each.
of the transmitter, the receiver, and the major parts of each.
12.1 Transmitter
The most important components of the transmitter are the Encoder/Button printed circuit board, the
RF Module, and an EEPROM.
12.1.1 Encoder/Button PCB
This module is the heart of the transmitter. It contains the pushbuttons, power
control circuitry, micro-controller, and EEPROM (see Figure 8). The micro-
controller encodes the information from the pushbuttons, along
with security code and error correction data, into a serial data
stream. This data stream, after passing through an audio-
frequency-shift-keying circuit, is sent to the transmitter RF
module.
12.1.2 Transmitter RF Module
This module is a narrowband FM transmitter with a digitally
synthesized frequency output using a phase locked loop circuit
(see Figure 9).
12.1.3 EEPROM
This component, found on both the Encoder/Button PCB and
Receiver/Decoder Module, contains all of the programming and
security code information used by the micro-controller. It is a
non-volatile memory device, meaning that it does not require
constant supply of power to hold its contents.
Figure 8: Encoder/Button PCB
Figure 9:
Transmitter RF
Module
Transmitter RF
Module