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2.3.2.2
2.3.3
User Interface (Keypad, STN Display, Volume and Frequency Knob) section .................2-2
2.3.3.1
2.3.3.2
2.3.3.3
2.3.3.4
2.3.4
Vehicle Interface Ports ......................................................................................................2-4
2.4
Receiver Section ............................................................................................................................2-5
2.4.1
VHF Band Radios..............................................................................................................2-5
2.4.1.1
2.4.1.2
2.4.2
UHF Range 1/UHF Range 2 Band Radios........................................................................2-5
2.4.2.1
2.4.2.2
2.4.3
700-800 MHz Band Radios ..............................................................................................2-6
2.4.3.1
2.4.3.2
2.5
Transmitter Section ........................................................................................................................2-6
2.5.1
VHF Radios .......................................................................................................................2-6
2.5.2
UHF Range 1/UHF Range 2 Radios .................................................................................2-6
2.5.3
700-800 MHz Radios........................................................................................................2-7
2.5.3.1
2.5.3.2
2.5.3.3
2.5.3.4
2.6
Frequency Generation Unit ............................................................................................................2-7
2.6.1
VHF MHz Radios...............................................................................................................2-7
2.6.2
UHF Range 1/UHF Range 2 Radios .................................................................................2-8
2.6.3
700-800 MHz Radios........................................................................................................2-8
2.7
Controller Section...........................................................................................................................2-9
2.7.1
Analog Mode of Operation ................................................................................................2-9
2.7.2
Digital (ASTRO) Mode of Operation................................................................................2-10
2.7.3
Controller Section Circuitry..............................................................................................2-10
Theory of Operation ............................................................3-1
3.1
Control Head Board........................................................................................................................3-1
3.2
Control Head Board Major Sections...............................................................................................3-1
3.3
Controller Section...........................................................................................................................3-2
3.4
Power Management .......................................................................................................................3-3
3.4.1
Power Distribution .............................................................................................................3-4
3.4.2
Power Up / Power Down Sequence ..................................................................................3-6
3.4.3
Reset Circuits ....................................................................................................................3-6
3.4.4
ATTiny13 Microcontroller Programming............................................................................3-6
3.5
User Interface.................................................................................................................................3-7
3.5.1
LCD Display ......................................................................................................................3-7
3.5.2
Keypad, Volume and Frequency Knob..............................................................................3-7
3.6
GCAI Accessory Interface ..............................................................................................................3-7
3.7
Main Board .....................................................................................................................................3-8
3.8
Main Board Major Sections ............................................................................................................3-8
3.8.1
VHF (136-174 MHz) Band ................................................................................................3-8
3.8.2
UHF Range 1 (380-470 MHz) and UHF Range 2 (450-520 MHz) Band .........................3-11
3.8.3
700-800 MHz Band.........................................................................................................3-13
June 15, 2005
Voltage Regulators...................................................................................................2-2
Display......................................................................................................................2-2
Keypad, Volume and Frequency Knob.....................................................................2-3
Status LEDs .............................................................................................................2-3
Backlight LEDs .........................................................................................................2-3
Front-End Section ....................................................................................................2-5
Back-End Section.....................................................................................................2-5
Front-End Section ....................................................................................................2-5
Intermediate Frequency and Back-End....................................................................2-5
Front-End Section ....................................................................................................2-6
Back-End Section.....................................................................................................2-6
RFPA........................................................................................................................2-7
Output Network ........................................................................................................2-7
Power Control...........................................................................................................2-7
Circuit Protection ......................................................................................................2-7
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6815854H01-A
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