HD Video Wireless Communication

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COFDM Wireless Downlink

COFDM Wireless Transmitter
COFDM Wireless Receiver

TDD Duplex Wireless Transceiver

  800M-1.4G IP Links 2W/5W
  800M-1.4G IP Links 10W
800M-1.4G-2.4G H265 Tx 300mW
  800M-1.4G-2.4G H265 Rx 300mW
5.8G H265 500mW


HDMI/AV Tx Module
SDI/AHD Tx Module
H265 Rx Module
H264 Rx Module
Relay Module
1W Power Amplifier

TDD OEM Modules

DLM Transceiver Module
DLB Transceiver Module
2W Power Amplifier(800M/1.4G)
5W Power Amplifier(800M/1.4G)
10W Power Amplifier(800M/1.4G)
H264/H265 Codec Modules
Video Encoder Enclosed
HDMI/AV Video Encoder
SDI/AHD Video Encoder
H.264 Video Decoder
H.265 Video Decoder


UART Config Panel

DLM full duplex wireless transceiver module for video and data Link

    -- TDD OFDM full duplex wireless transceiver module for video and data link
    -- Up to 30Mbps Iperf Throughput @20MHz channel
    -- Supports Point-to-Point and Point-to-Multipoint networks
    -- RF Tx Power: 25±2dBm
    -- Working Frequency: 806~826HMz, 1428~1448MHz, 2402~2482MHz
    -- Web UI or control uart for management
    -- 2 Ethernet and 1 TTL uart data link

Sihid DLM module was designed for video and data wireless transmission with two way wireless data link. This OFDM radio module works at 800MHz, 1.4GHz and 2.4GHz bands, with frequency hopping technology (FHSS) to make sure better stability signal communication.


  • TDD OFDM modulation
  • Supports three bands (806~826HMz/1428~1448MHz/2402~2482MHz)
  • Supports FHSS inside each band
  • 1.4/3/5/10/20MHz band widths
  • Max 30Mbps@20MHz throughput
  • RF transmission power: 25±2 dBm
  • Constellation: QPSK, 16QAM, 64QAM, self-adaption
  • Sensitivity: -106dBm(2.4GHz 1Mbps), -108dBm(1.4GHz 1Mbps), -108dBm(800MHz 1Mbps)
  • Supports IP data transmission(2 Ethernet port)
  • Supports serial data transmission(1 channel, TTL)
  • Up to 17km LOS (UAV-to-ground) and 2km LOS(ground-to-ground)
  • Web UI or control uart for management
  • AES128 encryption
  • Uplink and downlink stream control
  • Networking mode: Point-to-Point, Point-to-Multipoint, Relay, mesh(specify)
  • Movement Speed: Supports no less than 120km/h
  • Power input: 7~30V
  • Power consumption<4W
  • Dimensions: 58*48*10mm
  • Weight: 28g

Power in 2 welding hole, DC in:7~30V
Ethernet 1 4PIN PH1.25mm lockable connector
Ethernet 2 4PIN PH1.25mm connector
FPC_Main Designed for connecting with Sihid video encoder/decoder module
Data uart 3PIN PH1.25mm lockable connector, TTL 3.3V
Control uart 4PIN PH1.25mm connector, TTL 3.3V
USB 4PIN PH1.25mm connector, for software upgrading
Switch Tx/Rx control signal for outside power amplifier
Main antenna Tx/Rx Antenna port, IPEX
Second antenna Rx Antenna port, IPEX

Wireless networking with DLM

DLM module supports two operating modes: Access Node or Central Node. It can be managed through Web UI or AT command via config uart. DLM module supports features of maximum 16 Access Nodes connected to a Central Node. All of the Nodes are in a same wireless LAN and share the whole transmission bandwidth (maximum 30Mbps@20MHz throughput). Data from Central Node to Access Node, we call downlink, and data from Access Node to Central Node, we call uplink. Uplink and downlink stream ratio can be controlled through web UI or AT command. When using DLM module for Point-to-Point transmitting, uplink and downlink share the whole transmission bandwidth (maximum 30Mbps@20MHz throughput) too. DLM module supports networking mode: Point -to-Point, Point-to-Multipoint, Relay, and Mesh (specify mesh version when order).

Add Tx Power Amplifier

The maximum RF transmission power of DLM module is 25±2 dBm, Sihid also provides power amplifier to increase the RF Power to 2W/5W/10W. Below diagram shows how to add power amplifier outside of the DLM module.

Point-to-Point transmitting

Point-to-Multipoint transmitting

Relay transmitting

Mesh transmitting (Specify)


DLM overview.pdf

Room 608, Dongbian Commerce Building, #222 Minzhi Road, Longhua District, Shenzhen, China 518131
Email: or, Phone:+86-755-23765232, Skype ID:embestzgr
Copyright©Sihid Technology Limited 2015-2021 all rights reserved.

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