Chapter 3
UHF1 PCB/SCHEMATICS AND PARTS LISTS
1.0
Notes For All Schematics and Circuit Boards
* Component is frequency sensitive. Refer to the Electrical Parts List for value and usage.
1.
Unless otherwise stated, resistances are in Ohms (
k
= 1000), and capacitances are in
picofarads (pF) or microfarads (µF).
2.
DC voltages are measured from point indicated to chassis ground using a Motorola DC
multimeter or equivalent. Transmitter measurements should be made with a 1.2 µH choke
in series with the voltage probe to prevent circuit loading.
3.
Reference Designators are assigned in the following manner:
100 Series
=
Transmitter
200 Series
=
Frequency Generation
300 Series
=
Receiver
400/500 Series =
Controller
600 Series
=
Keypad Board
4.
Interconnect Tie Point Legend:
UNSWB+
=
Unswitch Battery Voltage (7.5V)
SWB+
=
Switch Battery Voltage (7.5V)
R5
=
Receiver Five Volts
CLK
=
Clock
Vdda
=
Regulated 3.3 Volts (for analog)
Vddd
=
Regulated 3.3 Volts (for digital)
CSX
=
Chip Select Line (not for LVZIF)
SYN
=
Synthesizer
DACRX
=
Digital to Analog Voltage (For Receiver Front End Filter)
VSF
=
Voltage Super Filtered (5 volts)
VR
=
Voltage Regulator
6-LAYER CIRCUIT BOARD DETAIL VIEWING
COPPER STEPS IN PROPER LAYER SEQUENCE
LAYER 1 (L1)
LAYER 2 (L2)
LAYER 3 (L3)
LAYER 4 (L4)
LAYER 5 (L5)
LAYER 6 (L6)
INNER LAYERS
SIDE 1
SIDE 2
Summary of Contents for GP-688
Page 5: ...Compact Professional Portable Radios Service Maintainability Issue July 2007 ...
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Page 64: ...3 12 CONTROLLER KEYPAD SCHEMATICS ...
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Page 147: ...Compact Professional Portable Radios VHF 136 174MHz Service Information Issue July 2007 ...
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Page 335: ...Compact Professional Portable Radios UHF2 450 527MHz Service Information Issue July 2007 ...
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