20km~150km Video Data Link For Airborne Wireless Duplex Video Data
Transmission
Key Features:
- TDD OFDM full duplex wireless transceiver for long range airborne
video data Link.
- Up to 30Mbps Iperf Throughput at 20MHz bandwidth channel.
- Support point to point, point to multipoint, relay, mesh Networks.
- Control through web browser or control uart.
- 2 Ethernet and 3 channel uart data link.
- Long distance transmission range with 10W RF power.
Overview:
HCL551 video data link was designed for video data wireless
transmission with two way wireless data link. This OFDM radio
device works at 800MHz or 1.4GHz bands, with frequency hopping
technology (FHSS) to make sure better stability signal
communication.
Technical Specifications:
| 20km~150km Video Data Link For Airborne Wireless Duplex Video Data
Transmission |
| 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 Transmissioin 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 |
Point to Point networking type
Point to Multipoint networking type
Relay networking type
Mesh networking type (Specify)
Application:
FAQ
Q1. This video data link seems to support IP camera, what if I want
to use a camera with HDMI or SDI video output?
A: 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?
A: 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.
A: Yes, it supports. There are two solutions for the multiple
cameras on transmitter to one receiver.
1. 4 IP cameras -> Net Hub -> Transmitter <===>
Receiver -> Computer Screen
2. 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?
A: 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?
A: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.
