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Hytera RD985 - Service Manual

Hytera RD985
333 pages
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Service Manual
Preface
This manual describes information related with product repair. To repair the product properly, please
read this manual carefully.
This manual is applicable to the following model:
RD98X (X may indicate 2, 5, 6 or 8.)

Table of Contents

Other manuals for Hytera RD985

Preview: User Manual
User Manual28 pages
Preview: Owner's Manual
Owner's Manual27 pages

Questions and Answers

  • L
    Linda MatthewsJul 30, 2025
    Why my Hytera RD985 Repeater group members cannot talk to each other?
    • C
      Christopher HowellJul 30, 2025
      There are several reasons why group members might not be able to communicate using the Hytera Repeater. It could be that the TX/RX frequency of the repeater is inconsistent with that of the portable/mobile terminals; in this case, re-set the frequencies. Alternatively, a strong interference signal may be preventing the repeater from repeating a useful signal; if you cannot remove or bypass the interference, change to operate at other frequencies. Finally, the group member may be out of the coverage area of the repeater; move within the coverage area.
  • R
    Ryan HallAug 6, 2025
    How to fix short communication range or poor audio on Hytera Repeater?
    • S
      Stephanie EdwardsAug 6, 2025
      If you are experiencing short communication range or poor audio quality with your Hytera Repeater, it could be due to several factors. There might be leakage of signal energy due to a damaged connection cable; if necessary, replace the cable. Check for a loose or lost connection between the antenna connector and the cable; secure or replace the cable. Invisible damage to the cable can also cause this issue, so replacing the cable is advisable. If a duplexer is mounted, it may not be properly set; in this case, contact the manufacturer or your dealer to re-set the duplexer.
  • C
    Christian MooreAug 14, 2025
    What to do if Hytera Repeater cannot be powered on?
    • J
      Joseph ChangAug 14, 2025
      If your Hytera Repeater is not powering on, the power cord may not be properly or securely connected to the outlet; properly connect the power cord and ensure a secure connection. Another possibility is that the power cord fuse is damaged; check if the fuse has blown, and if so, replace it with a new one.
  • C
    christopher71Aug 20, 2025
    What to do if group members cannot talk to each other on Hytera Repeater?
    • J
      Jody SmithAug 21, 2025
      If group members cannot communicate with each other on the Hytera Repeater, even with RX indication, the issue might stem from an inconsistent ID with other group members; set your ID to match the others. Another potential cause is inconsistent CTCSS/CDCSS settings; re-set the CTCSS/CDCSS.

Summary

Product Controls

Front Panel Controls

Rear Panel Controls

Baseband Section Overview

Baseband Section: Main Board

Details the main board components, including processors, memory, and peripheral interfaces.

Baseband Section: Block Diagram

Baseband Section: Schematic Diagrams

Baseband Section: Troubleshooting Flow Chart

Tuning Description

Interface Definition

Interface Definition: PA-Baseband Connection

Interface Definition: Exciter-Baseband Connection

Interface Definition: RX-Baseband Connection

UHF1 (400-470 MHz) Information

UHF1 Information: TX Circuit

Details the TX circuit, including PA, power control, diagnosis, and protection circuits.

UHF1 Information: RX Circuit

Describes the RX circuit, comprising RF band-pass filter, LNA, mixer, and IF processor.

UHF1 Information: Frequency Generation Unit (FGU)

UHF2 (450-520 MHz) Information

UHF2 Information: TX Circuit

Details the TX circuit, including PA, power control, diagnosis, and protection circuits.

UHF2 Information: RX Circuit

Describes the RX circuit, comprising RF band-pass filter, LNA, mixer, and IF processor.

UHF2 Information: Frequency Generation Unit (FGU)

UHF3 (350-400 MHz) Information

UHF3 Information: TX Circuit

Details the TX circuit, including PA, power control, diagnosis, and protection circuits.

UHF3 Information: RX Circuit

Describes the RX circuit, comprising RF band-pass filter, LNA, mixer, and IF processor.

UHF3 Information: Frequency Generation Unit (FGU)

VHF (136-174 MHz) Information

VHF Information: TX Circuit

Details the TX circuit, including PA, power control, diagnosis, and protection circuits.

VHF Information: RX Circuit

Describes the RX circuit, comprising RF band-pass filter, LNA, mixer, and IF processor.

VHF Information: Frequency Generation Unit (FGU)

Disassembly and Assembly

Product Disassembly Steps

Product Assembly Steps

Exploded View

Specifications

General Specifications

Lists general electrical and physical specifications, including frequency range, channel capacity, and dimensions.

Transmitter Specifications

Details specifications for the transmitter, including power output, modulation, and emissions.

Receiver Specifications

Hytera RD985 Specifications

General IconGeneral
Dimensions88 x 483 x 366 mm
Weight8.5 kg
Frequency RangeUHF: 400-470 MHz, VHF: 136-174 MHz
Channel Capacity1024
Channel Spacing12.5/20/25 kHz
Operating Voltage13.6V DC ±15%
Operating Temperature-30°C to +60°C
Digital ProtocolDMR
Modulation16K0F3E
Power Supply100-240 V AC, 50/60 Hz

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