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Precautions for minimizing damage from electrostatic discharge to sensitive devices.
Outlines the scope, service support, and radio specifications.
Specifies the manual's intended audience and content currency.
Provides guidance on navigating the manual's sections and content.
Details Motorola's product support, including warranty and after-warranty services.
Lists general, transmitter, and receiver technical specifications for the radio models.
Introduces the chapter's content on available models and accessories.
Presents a detailed chart listing radio models and their configurations.
Lists available accessories categorized into hardware kits, microphones, speakers, cables, and others.
Explains the chapter's content on disassembly, assembly, and test equipment.
Provides step-by-step instructions for disassembling the radio's main components.
Details the procedures for reassembling the radio's control head and transceiver board.
Includes visual diagrams showing exploded views of radio components and their part numbers.
Lists recommended service aids and tools required for radio maintenance.
Details the standard and unique test equipment required for servicing the radio.
Outlines procedures for radio alignment and tuning using service software.
Provides a detailed explanation of the radio's operation and components.
Describes the functions and architecture of the radio's controller section.
Explains the role of the AFIC in audio shaping, filtering, amplification, and attenuation.
Details the internal and external microphone signal paths, including DC biasing.
Explains how sub-audible data signals are generated, filtered, and summed with audio.
Describes how the IF IC controls squelch characteristics and generates a squelch indicator signal.
Details the audio power amplifier stages, input level setting, and enabling signals.
Explains how the microprocessor decodes sub-audible data signals via the AFIC's PL detector output.
Describes the pre-selector filters and pre-amplifier stages responsible for incoming signal filtering.
Explains the first stage of the power amplifier and its role in controlling RF output power.
Lists PCB layouts, schematic diagrams, and parts lists for the UHF main board.
Lists PCB layouts, schematic diagrams, and parts lists for the VHF main board.
Lists PCB layouts, schematic diagrams, and parts lists for control heads.
Introduces the chapter's focus on 216-246 MHz models and their specifications.
Presents a model chart for GM950i radios covering the 216-246 MHz range.
Details the general, transmitter, and receiver technical specifications for the 216-246 MHz band.
Outlines the general setup and procedures for radio alignment in the 216-246 MHz band.
Details the critical PA bias voltage adjustment procedure to ensure proper radio operation.
Explains how to set the battery threshold levels (Tx High and Tx Low) for determining battery condition.
Describes the procedure for setting transmitter power levels, including important considerations for customer applications.
Explains the critical adjustment of the reference oscillator for proper radio operation and frequency stability.
Details the alignment procedure for the front-end pre-selector, used when receiver sensitivity is poor.
Outlines the process for setting the rated volume softpot for normal test modulation.
Describes how to set squelch softpots to determine the signal-to-noise ratio for opening the squelch.
Details the procedure for setting the maximum carrier deviation using a low-frequency tone.
Provides a detailed theory of operation for the radio and its components.
Explains the radio's controller architecture, including digital control, audio processing, power control, and voltage regulation.
Describes the function of the AFIC in processing RX/TX audio signals, including filtering and amplification.
Details the signal path for internal and external microphones, including DC biasing and AFIC input.
Explains the generation and processing of sub-audible data signals used for signalling.
Describes the IF IC's role in controlling squelch characteristics and generating squelch indicator signals.
Details the audio power amplifier stages, input level setting, and enabling signals.
Explains how the microprocessor decodes sub-audible data signals via the AFIC's PL detector output.
Describes the pre-selector filters and pre-amplifier stages responsible for incoming signal filtering.
Explains the first stage of the power amplifier and its role in controlling RF output power.
Lists all PCB layouts, schematic diagrams, and parts lists for the 216-246 MHz models.
Shows the component placement on the top side of the 216-246MHz main board PCB.
Shows the component placement on the bottom (solder) side of the 216-246MHz main board PCB.
Provides the first part of the schematic diagram for the 80-channel closed controller.
Provides the second part of the schematic diagram for the 80-channel closed controller's I/O.
Details the schematic for the radio's supply voltage regulation and distribution circuits.
Presents the schematic diagram for the radio's power control loop and related circuitry.
Shows the schematic diagram for the 5-25W power amplifier section of the radio.
Illustrates the schematic diagram of the radio's frequency synthesizer subsystem.
Details the schematic diagram of the radio's voltage-controlled oscillator (VCO) circuits.
Provides the schematic diagram for the radio's Receive Front-End (RX-FE) section.
Presents the schematic diagram for the radio's Receive Intermediate Frequency (RX-IF) section.
Lists PL (CTCSS) and DPL codes tested and acceptable for programming.
Identifies specific frequencies that can cause internal interference and affect receiver sensitivity.
Details the pin functions of the 16-pin accessory connector for various radio models.
Describes the pin assignments and functions of the 8-pin Telco microphone connector.
Explains modifications needed for configuring the radio for base station operation.
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General