Справочник Пользователя для MGP Instruments Inc. CTM2000
Apex Wireless / Schlumberger Confidential
1
HR23x0 Theory of operation
1.1. System
Architecture
A conventional superheterodyne architecture is used for this receiver. The receiver
interface is a standard RS-232 interface. The system architecture is shown in the
following block diagram.
interface is a standard RS-232 interface. The system architecture is shown in the
following block diagram.
130.38 MHz
BPF
10.7 MHz BPF
150 KHz BW
10.7 MHz BPF
400 KHz BW
80.7 MHz
2nd LO
RSSI Det
Wide Band
RSSI Det
Narrow Band
PLL
IC
Schlumberger Proposed Universal Receiver
Block Diag
IF AMP
IF AMP
Frequency
Discriminator
Mux /
ADC
Data Detector /
Radio Driver uP
Atmel AVR
PLL Control Lines
DDS
Synthesizer
PLL Ref Freq
8052 uP
Interface
Logic
RS232
Port
1st LO
RF
1st IF
Radio PCB
Digital PCB
2.
Receiver Functional Architecture and Design
The drawing illustrated above shows the system block diagram The digital section
incorporates a DDS synthesizer, which will allow for fast frequency scanning.
incorporates a DDS synthesizer, which will allow for fast frequency scanning.
2.1.
Signal Detection / Frequency Scanning