Motorola Gm1200e Detailled 68p64115b15 Manual

 
Theory of Operation
Introduction/Theory of Operation2.1-5
 
When the host radio needs to communicate to the control head  
m  
P it brings the control head select 
line (CNTL HD CE) to a logic ‘0’ and then sends the proper data and clock signals. After the data has 
been sent the control head select line is returned to a logic ‘1’. When the control head  
m  
P wants to 
communicate to the host radio the  
m 
P brings request line CNTL HD REQ to a logic ‘0’ by switching 
on transistor Q0931 via  
m 
P...

 
Theory of Operation
2.1-6Introduction/Theory of Operation
 
The display driver is fixed on the flex which connects the display to the PC board. The driver 
contains a data interface to the  
m 
P, an LCD segment driver, an LCD power circuit, an oscillator, data 
RAM and control logic. At power up the driver’s control logic is reset by a logic ‘0’ at input RES 
(U0902-9). Resistor R0946 sets the driver’s internal oscillator to about 18 kHz. By connecting U0902 
pin 12 to +5V the driver’s  
m 
P interface...

 
PCB/Schematic Diagram and Parts List2.2-i 
Chapter 2.2 
PCB/Schematic Diagram and Parts List 
Table of Contents 
Table of Contents 
Description Page 
Display/Keypad Radio Control Head (K6) - Diagrams and Parts Lists 
PCB Layout Top Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PCB Layout Bottom Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Schematic Diagram  1 of 2  . . . . . . ....

 
Table of Contents
2.2-iiPCB/Schematic Diagram and Parts List 

 
UHF/VHF Radio - Level 3 Information3-i 
Chapter 3 
UHF/VHF Radio - Level 3 Information 
Table of Contents 
Table of Contents 
Chapter 
3.1 Introduction/Theory of Operation
3.2 PCB/Schematic Diagrams and Parts Lists 

 
Table of Contents
3-iiUHF/VHF Radio - Level 3 Information 

 
Introduction/Theory of Operation3.1-i 
Chapter 3.1 
Introduction/Theory of Operation 
Table of Contents 
Table of Contents 
Paragraph Page 
1.0 Introduction  
................................................................................................  1  
2.0 Open Controller  
..........................................................................................  1
2.1 General ........................................................................................................  1
2.2...

 
Table of Contents
3.1-iiIntroduction/Theory of Operation
 
Paragraph Page 
5.0 Transmit Signalling Circuits 
...................................................................  12
5.1 Sub-audible Data (PL/DPL) .......................................................................  12
5.2 High Speed Data .......................................................................................  13
5.3 Dual Tone Multiple Frequency (DTMF) Data .............................................  13 
6.0 Receive...

 
Table of Contents
Introduction/Theory of Operation3.1-iii  
 
Paragraph Page 
VHF (136-174MHz) SPECIFIC CIRCUIT DESCRIPTION
11.0 Receiver Front-End 
.................................................................................  25
11.1 Front-End Band-Pass Filter and Pre-Amplifier ..........................................  25
11.2 Mixer and Intermediate Frequency (IF) Section ........................................  26
11.3 IF IC (U5201)...

 
Table of Contents
3.1-ivIntroduction/Theory of Operation