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General| Channels | 16 |
|---|---|
| IP Rating | IP54 |
| Model | VZ Series |
| Type | Professional Two-Way Radio |
| Frequency Range | VHF: 136-174 MHz |
| Power Output | VHF: 5W; UHF: 4W |
| Battery Type | Li-Ion |
Provides a visual guide to the radio's external components and their labels.
Details the signal path from antenna to speaker within the transceiver.
Explains the signal path from microphone to antenna during transmission.
Describes the circuit responsible for switching between transmit and receive modes.
Covers the digital control functions including side keys and reset circuits.
Explains circuits related to battery monitoring and power saving modes.
Details the roles of the DSP and synthesizer within the IC.
Covers the IC's base clock capabilities and serial control interface.
Settings for channel access, voice activation, transmission power, and reception threshold.
Configuration of audible alerts, transmission limits, bandwidth, and emergency functions.
Controls power saving features and the end-of-transmission audible alert.
Procedures for radio data transfer and PTT ID transmission configuration.
Lists available functions that can be assigned to the side keys.
Detailed schematic diagram for the 136-174MHz VHF version.
Detailed schematic diagram for the 400-470MHz UHF version.
Detailed schematic diagram for the 350-390MHz version.
Component layout and values for the 136-174MHz VHF version PCB.
Component layout and values for the VZ-28-U03 136-174MHz version PCB.
Component layout and values for the 400-470MHz UHF version PCB.
Component layout and values for the VZ-28-U03 400-470MHz version PCB.
Component layout and values for the 350-390MHz version PCB.
Component layout and values for the VZ-28-U02 350-390MHz version PCB.
PCB component placement diagram for the 400-470MHz UHF version.
PCB component placement diagram for the VZ-28-U03 400-470MHz version.
PCB component placement diagram for the 350-390MHz version.
PCB component placement diagram for the VZ-28-U02 350-390MHz version.
Solutions for problems related to the radio not receiving power.
Addresses issues causing rapid battery drain after charging.
Guides on resolving failures in communication with other group members.
Diagnoses and resolves issues with voice transmission clarity and volume.
Provides solutions for constant background noise affecting reception.
