COFDM Relay Repeater module for drone UAV wireless video transmitter and receiver Vcan1870

COFDM Relay Repeater

COFDM Relay Repeater module for drone UAV wireless video transmitter and receiver Vcan1870

Introduction

The module is a relay module, not a completed item. Customers need to add a power amplifier, filters, and receiving and transmitting antennas for it to work effectively. These need to be customized according to the two working frequencies selected by the customer.

To prevent interference, the drone employs a single frequency (e.g. 400Mhz) for communication with the relay, and a different frequency (e.g. 700Mhz) for communication between the relay module with the receiver. The separation between the two should be as large as possible.

Feature

1. Wireless Video COFDM Video Data demodulation and re-modulation
2. Stable signal transfer in NLOS and high-speed moving (less than 600km/hour)
3. Adjustable working frequency, bandwidth, transmission power, etc (Special Parameter Configure Tool or UART STM32 LoRA )
4. Lowest latency 200-300 milliseconds
5. Widely frequency range 200Mhz-3000Mhz
6. Support AES256
7. Bandwidth 1Mhz-8Mhz optional
8. Video signal repeater for long-distance

Introduction

Specification:

IO

RF input	Two SMA females (to receive the signal)
RF output	MMCX female (to send out the signal again)
control UART	4PIN PH1.25mm Connector
Power in	2PIN PH2.54mm phenix Connector
TF-card	For firmware update
Power led	red LED, constant light when the device is normally powered
Link led	green led, blinks on transmitting the received data

Demodulation and Modulation

Modulation Formats	COFDM(DVB-T)
Carriers	2K
Bandwidth	Configurable from 1MHz to 8MHz, step by 1KHz
FEC	1/2, 2/3, 3/4, 5/6, 7/8
Guard interval	1/32, 1/16, 1/8, 1/4
Constellation	QPSK, 16QAM, 64QAM
Bitrates	0.5Mbps to 31.67Mbps

RF Received

Frequency Bands	160MHz~860MHz (need an extra down converter block for 860-2300Mhz)
Tuning Step size	1KHz
Sensitivity	-97±1dBm(BW=8MHz, QPSK, CR=2/3, GI=1/16) for one channel and add 3dBm for two-channel

RF Transmitted

Frequency Bands	200MHz~2300MHz(other bands can be supported with special manufacturing)
Tuning Step size	1KHz
Power out	Configurable, maximum -5dBm(subject to frequency)

Monitoring and control
This COFDM relay repeater module can complete setup with our Parameter Configure Tool or STM32+LoRA (or other devices) via control uart. With our parameter configure too, the following parameters can be set:
– RX Received frequency (F1) and bandwidth (B1)
– TX Transmitted frequency (F2), bandwidth (B2), FEC, guard interval, constellation, and transmission power

Temperature range
Full specification: 0° to +70°C Ambient
Storage: –40° to +80°C

Power requirements
Input range: 7~24VDC
Power consumption: <250mA@12V

Physical Characteristics
Dimensions: 73x51x15mm
Gross Weight: 32.4 grams

 

UART AT commands

The AT commands mainly used in the COFDM Wireless Relay Repeater are ATDR, ATSD, ATGD, ATSR, ATGR, and ATGB. For the introduction of specific commands, see the document.

FAQs

1. What frequency does it support? Does it work well for my existing cofdm video transmitter and receiver?

1. Our COFDM Video Transceiver relay repeater supports 170-860Mhz. The COFDM transmitter also supports 2300Mhz, but the COFDM receiver only supports up to 860Mhz, 861-930Mhz receiver our COFDM-221 supports, over 930Mhz-2300Mhz needs to plus the frequency downconverter block to support.
2. Our COFDM relay repeater module supports all the COFDM transmitters and receivers, the transmission distance depends on your external power amplifier and filter support.

2. Does this module support over 1.4G? for example 2.4G, 3G, or 3.6G？

1. Yes, support.

   COFDM Video encoder modulator transmitter module 3.5G and 4G test result.

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The below model is good for a two-way TDD bidirectional link of the Wireless relay transmitter and receiver or wireless transmitter and receiver relay repeater.