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Motorola GP328 Detailed Service Manual

Motorola GP328
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4-4 Controller Board
ModB/Vstby Supply
Under various conditions, the supply to the ModB/Vstby would vary. Table 4-1 shows these
conditions and circuits in operation.
Table 4-1: ModB/Vstby Supply Modes
Condition Circuit Operation
Radio On Vdd supply voltage via CR411
Radio Off Vdd turned off
Q416 gate is pulled low by R462
Q416 is switched on
U410 supplies 3.2V to ModB/Vstby
Primary battery removed Vdd turned off
Q416 gate is pulled low by R462
Q416 is switched on
LiO battery provides 3.2V to ModB/Vstby
Flash Mode Boot_Ctrl line pull low
ModA & ModB goes low
Processor in boot-strap mode
Flashing enabled

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Motorola GP328 Specifications

General IconGeneral
Channel Capacity16 channels
Operating Temperature-30°C to +60°C
SealingIP54
Frequency Range136-174 MHz (VHF), 403-470 MHz (UHF)
Power Output1-5W (VHF), 1-4W (UHF)
Dimensions137 x 57.5 x 37.5 mm
Power Supply7.5V
Battery Life8 hours (High Power), 11 hours (Low Power) with standard NiMH battery
Weight420g (with standard battery)

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