Motorola GP360 Service Information

1-2 THEORY OF OPERATION
3.0 Controller Circuits
3.1 Controller Architecture
The controller board is the central interface between the various subsystems of the radio. It is
separated into MCU digital and audio/signalling architectures as shown in Figure 1-2.
Figure 1-2 Controller Block Diagram
3.2 MCU Digital Architecture
( Refer to Figure 1-2, the Microprocessor and the Memory schematic diagrams )
The digital architecture portion consists of a microcontroller and associated EEPROM, RAM, and
ROM memories. The architecture is commonly used for both low-tier and high-tier products and also
includes conventional and trunking portables. Combinations of different size RAM and ROM are
available to support various application software. RAM supports 8KB and 32KB sizes. ROM
supports 128KB, 256KB, and 512KB sizes. Table 1-1 shows the ROM, RAM and EEPROM
requirements for different applications.
External
Microphone
Internal
Microphone
External
Speaker
Internal
Speaker
SCI to Side
Connector
Audio/Signalling
Architecture
To Synthesizer
Mod
Out
16.8 MHz
Reference Clock
from Synthesizer
Recovered Audio
Squelch
To RF Board
SPI
MCU
Digital
µP Clock
3.3V
Regulator
(Vddd)
RAM
EEPROM
ROM
Microcontroller
ASFIC_CMP
3.3V
Regulator
(Vdda)
Architecture
Audio Power
Amplifier/Filter

Motorola GP360 Specifications

Battery

battery life with standard high capacity NiMH battery low power	11 hours
battery life with standard high capacity NiMH battery high power	8 hours
battery life with ultra high capacity NiMH battery low power	14 hours
battery life with ultra high capacity NiMH battery high power	11 hours
battery life with NiCD battery low power	12 hours
battery life with NiCD battery high power	9 hours
battery life with Li-lon low power	11 hours
battery life with Li-lon high power	8 hours

Operating Environment

operating temperature	-20°C to +55°C
sealing	Withstands rain testing per MIL STD 810 C/D/E and IP54
shock and vibration	Protection via impact resistant housing exceeding MIL STD 810-C/D/E and TIA/EIA 603
dust and humidity	Protection via environment resistant housing exceeding MIL STD 810 C/D/E and TIA/EIA 603

Transmitter Specifications

frequencies full bandsplit VHF	136-174 MHz
frequencies full bandsplit UHF	403-470 MHz
channel spacing	12.5/20/25 kHz
frequency stability	±2.5 ppm
power VHF	1-5W
power UHF	1-4W

Receiver Specifications

frequencies full bandsplit VHF	136-174 MHz
frequencies full bandsplit UHF	403-470 MHz
channel spacing	12.5/20/25 kHz
frequency stability	±2.5 ppm
sensitivity (12 dB SINAD) EIA	0.25 µV typical
sensitivity (20 dB SINAD) EN	0.50 µV typical

Weight and Dimensions

dimensions with standard high capacity NiMH battery	137 x 57.5 x 37.5 mm
dimensions with ultra high capacity NiMH battery	137 x 57.5 x 40.0 mm
dimensions with NiCD battery	137 x 57.5 x 40.0 mm
dimensions with Li-lon battery	137 x 57.5 x 33.0 mm
weight with standard high capacity NiMH battery	428 gm
weight with ultra high capacity NiMH battery	508 gm
weight with NiCD battery	458 gm
weight with Li-lon battery	358 gm