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1.0
Allocation of Schematics and Circuit Boards
1.1
VHF (136-162MHz)
The VHF circuits are contained on the printed circuit board (PCB) which also contains the Controller
circuits. This Chapter shows the schematics for the VHF circuits, the Controller circuits are
contained in Section 2 of this manual. The PCB component layouts and the Parts Lists in this
Chapter show both the Controller and VHF circuit components. The VHF schematics and the related
PCB and parts list are shown in the table below.
PCB :
SCHEMATICS
Parts List
1.2
Six Layer Circuit Board
The main PCB is a 6-layer circuit board, the copper steps are in the layer sequence shown below.
VHF PCB/SCHEMATICS/PARTS LISTS
Table 4-1 VHF Diagrams and Parts Lists
8486769Z02_A Main Board Top Side
8486769Z02_A Main Board Bottom Side
Radio Circuit Block Diagram
Receiver Front End
Receiver Back End
Synthesiser
VCO
Transmit and Power Control Cct
8486769Z02_A
SIDE 1
LAYER 1 (L1)
LAYER 2 (L2)
LAYER 3 (L3)
LAYER 4 (L4)
LAYER 5 (L5)
LAYER 6 (L6)
SIDE 2
Page 4-3
Page 4-4
Page 4-5
Page 4-6
Page 4-7
Page 4-8
Page 4-9
Page 4-10
Page 4-11
INNER LAYERS
Chapter 4