150km COFDM Radio Link UAV Video Transmitter For Duplex Video Data Transmission
Key Features
- TDD OFDM full duplex wireless transceiver for UAV video data link
- Maximum 30Mbps Iperf Throughput at 20MHz bandwidth
- Support point to point and point to multipoint networking
- Control by Web UI or Serial control uart
- 2 Ethernet and 3 channel uart data link
- Long transmission distance up to 150km with 10W RF power
Overview
HCL551 UAV video transmitter was designed for long range video data wireless transmission with bidirectional wireless data link. It works at 800MHz or 1.4GHz bands, with frequency hopping spread spectrum technology (FHSS) to ensure stable signal communication.
Technical Specifications
| Model Number |
HCL551 |
| Modulation |
TDD OFDM |
| Frequency |
806~826MHz, 1428~1468MHz, 1420~1530MHz |
| FHSS |
Support |
| Bandwidths |
1.4/3/5/10/20MHz |
| Throughput |
Maximum 30Mbps@20MHz |
| RF Transmission Power |
10W (40~42 dBm) |
| Constellation |
QPSK, 16QAM, 64QAM self adaption |
| Sensitivity |
-108dBm (1Mbps) |
| Ethernet ports |
2 × Ethernet ports |
| Serial ports |
3 channels, RS232/TTL/Sbus optional |
| Transmission Range |
30~150km (UAV to Ground, optional distance grade) |
| Management |
Web UI and Control Uart |
| Encryption |
AES128 |
| Networking Mode |
Point to Point, Point to Multipoint, Relay, Mesh |
| Movement Speed |
Support no less than 300km/h |
| Power Input |
24~30V, 28V as default |
| Power Consumption |
<40W (RF Power 10W) |
| Dimensions |
131.9 × 67.7 × 28mm |
| Weight |
252g |
Input / Output Ports
| I/O |
Description |
| Ethernet 1 |
4Pin ZH1.5mm connector, bridged with Ethernet2 |
| Ethernet 2 |
RJ45 connector, bridged with Ethernet1 |
| Uart*3 |
3Pin GH1.25mm lockable connector*3, 3 channel uart, RS232/TTL/Sbus optional |
| Power in |
XT30PW-M connector |
| ANT 1 |
Tx/Rx Antenna port, SMA female |
| ANT 2 |
Rx Antenna port, SMA female |
Networking Types
Point to Point
Point to Multipoint
Relay
Mesh
Frequently Asked Questions
Q1. It seems to support IP camera, what if I want to use a camera with HDMI or SDI video output?
Yes, the default video input is IP RJ45 Ethernet port. If your camera only has HDMI, SDI, AHD or AV output, you need to buy our mini encoder device to encode the video and audio signal into digital data for transmission. At the receiver end, you can connect it directly to your computer or NVR. If you want to output to an HDMI monitor, you can also buy our decoder device to convert the digital data back into HDMI video and audio signals.
Q2. Should I choose 800MHz or 1.4G band? Which one is better?
If your area has a DVB-T or DVB-T2 digital television signal, the TV frequency range is 170-860Mhz, so choose 1.4G would be better. Moreover, GPS antenna receives the GPS signal and the GPS direction on the drone is up, and our transmitter antenna is pointing down to send the signal to the ground. So the 1.4G frequency effect on GPS is negligible.
Q3. Does it support using multiple cameras on the transmitter to only one receiver? For example, use 3 IP cameras on the transmitter.
Yes, it supports. There are two solutions for the multiple cameras on transmitter to one receiver:
- 4 IP cameras → Net Hub → Transmitter ↔ Receiver → Computer Screen
- 4 IP cameras → NVR HDMI output → HDMI encoder IP output → Transmitter ↔ Receiver → computer screen.
Q4. Does the transmitter on the air give failsafe command to the flight controller when the connection between air and ground will be lost?
The serial port of our wireless video transmission link is transparent, no data is actively sent to the flight controller. This is controlled by the ground station. It won't send failsafe command, but you can see the link working status led from the signal indicator as below:
| Link LED |
Wireless link status |
| No light |
This node is not connected with the wireless network |
| Red light |
The wireless link signal is weak |
| Orange light |
The wireless link signal is in middle |
| Green light |
The wireless link signal is strong |
Flight controller doesn't get the information, but you can see the link status LED light. If it is Orange or Red, you should control the UAV back in advance. You can also get the RSSI values from below window.
Q5. Can the air unit and ground unit be interchanged for use with change in the setting?
The difference between the air unit (transmitter) and ground unit (receiver) is:
- Device type: Air unit (transmitter) is the access node and the ground unit (receiver) is the central node.
- Rate ratio of the downlink and up link. Over 30km, the best rate ratio is 4:1 or 3:2.
Q6. Does it support 4K video?
Yes, it supports 4K video, but the transmission range would be shorter than that of 1080P.
Q7. What are the difference between model HCL536 and HCL551?
The main difference is in the power. HCL551 supports a transmission distance up to 150 kilometers, while HCL536 only supports a transmission distance up to 100 kilometers.
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