User's Manual

EX7100 Technical Manual - Module Descriptions
©1999 Exicom Technologies (1996) Ltd 7-9 Issue 3 - May 2001
7.3 VHF Transmitter Module Type 8027
7.3.1 General
The VHF Transmitter module accepts data from the Modem Controller module Type 2966
(via the VHF Receiver module Type 8029). This data is filtered, modulated with a locally
generated carrier, amplified and then filtered again ready for amplification by the VHF RF
Power Amplifier Module (PA) Type 8028.
A microcontroller on the Transmitter Module provides control and metering for the
Transmitter, PA, Receiver and Receiver Front-End (FE). The microcontroller on the
Transmitter module also stores configuration information for the Transmitter, Receiver
and RF PA modules.
Figure 7.6 below shows the connections between the RF modules and the
Modem/Controller module. This diagram should be referred to when reading the VHF RF
module sections following.
Transmitter
Module
Receiver
Module
RF PA
Module
Receiver
Front End (FE)
Module
Duplex Filter
(Duplexer)
PL103
Modem/Controller
Data & Comms
Rx RF
Tx RF
Tx Drive
RF
Rx RF
Antenna
Data & Comms
W102
PL101
PL108
W101
Metering
Metering
AGC
AGC, Control & Metering
PL102
SK102
SK101
PL100
Figure 7.6: VHF RF Module Connection Block Diagram