COFDM无线视频接收器HDMI CVBS输出迷你调制器模块RX长距离FPV UAV

COFDM 无线视频接收器 HDMI CVBS 输出

COFDM Wireless Video Receiver HDMI CVBS output mini modulator module long distance fpv UAV Data Transmission UART config Recorder

为之工作 COFDM-905T

 

HD digital wireless video transmission receiver COFDM-905R
内置解码板和COFDM双天线接收解调模块, 整机采用铝合金外壳, 接收灵敏度高, 低解码显示延迟, 高清视频输出稳定清晰.

特征

1. 双天线接收
2. 支持工作频率范围: 160兆赫~860兆赫, 中心工作频率可配置;
3. 无线带宽可配置;
4. 双天线接收灵敏度-100±1dbm (四相移键控8MHz);
5. 无线接收状态信息 (例如接收信号强度, 空中接口速率, 数据速率, 工作频率, 无线带宽, ETC。) 可通过OSD切换按钮在视频屏幕上叠加/不显示, 或输出到串口 (定制) ;
6. 低延迟H264视频解码, 支持1080P@60解码播放;
7. 音视频输出 (HDMI, CVBS, USB口同时输出):
   1. HDMI Type-A口音视频输出
   2. CVBS (莲花头) AV音视频输出
   3. 通过USB口输出视频流到手机/平板解码显示器
8. 支持视频接收和解密功能 (与发送端视频加密相匹配);
9. 支持TF卡或U盘录像;
10. 提供单向单向透明数据传输串口;
11. 提供参数来配置串口的工作设置 (比如中心工作频率, 无线带宽, 接收解密密码);
12. Power supply: 6～15V, 工作功耗230mA@12V.
13. 机器尺寸: 115x90x34mm
14. 机器重量: 243 克

连接器:

1. ANT-in: 无线信号输入天线接口, SMA外螺纹内孔
2. HDMI: A型HDMI载体, 高清音视频输出接口
3. CVBS: 模拟视频输出接口
4. AL/AR: left and right channel analog audio output
5. Power 连接器: 3PIN 2.54mm socket
6. USB 界面:
   1. External phone or tablet can be used to output audio and video to mobile phone or tablet for decoding display
   2. 录制视频可外接U盘或USB硬盘
7. OSD按钮:
   The receiving status information displays the on/off button, and the long press button can switch the switch status, and the switch status will be powered off. When the reception status information display is turned on, it is displayed in red in the upper left corner of the output video screen:
   1. 射频：338.0兆赫带宽：4.0兆赫
      四相相移键控CR：2/3 胃肠道：1/16
      空气：3.90Mbps
      可变比特率：3.05Mbps AES 关闭
      信号1：27 信号2：22
      误码率1：0.14% 误码率2：100.00%
      录制关闭 无存储
   2. 射频 indicates the center operating frequency, 和 体重 indicates the working bandwidth.
      QPSK is the modulation mode, CR是卷积码率, GI是保护间隔.
      空气 is the air interface rate
      可变比特率 is the video bitrate, AES 关闭 means no encryption
      信号1 refers to the received signal strength near the HDMI port antenna, 和 信号2 refers to the other antenna.
      Ber1 refers to the BER error rate near the HDMI port antenna, 和 误码率2 refers to another antenna.
      REC OFF means no video storage
8. When the wireless receiving signal is interrupted or weak, 输出视频屏幕将被中断 (重新接收信号画面将自动恢复), and display: 已断开连接, 无信号
9. REC button: Video recording on/off button, short press button to switch state, start recording after power is detected. The system defaults to recording to the TF card. 如果没有插入TF卡, 它被记录到USB闪存驱动器. 如果没有插入, 他们不会被记录.
10. 链接指示器: The wireless receiving link working status indicator lights up after the system is started and blinks when the receiving signal is normal.
11. REC indicator: The video recording indicator will flash at the low frequency when recording video, otherwise the high frequency will flash.
12. PWR indicator: 电源指示灯.
13. CFG serial port: Parameter configuration Serial port, you can configure wireless receiving related parameters, 比如中心工作频率, 无线带宽, decryption password, ETC. Vcan provides a matching parameter configuration panel SconB to facilitate user parameter setting.
14. 数据串口: 串口数据透明传输. The serial port data of the transmitter can be wirelessly transmitted to the receiver and output from the serial port.
15. TF卡接口: Used for software upgrade maintenance or for storing video.

注意

When the COFDM-905T transmitter and COFDM-905T receiver form a point-to-point wireless video transmission system, the video delay indicator:
The three indicators of video delay, video bit rate, and air interface rate are mutual influence and mutual restraint. When the air interface rate is greater than 5 times the video code rate, the video delay is minimum. 在这种情况下, the actual test is that the video delay is about 60 milliseconds when the code is transmitted at 720P@60, 视频延迟约为 130 milliseconds at 1080P@60. The delay refers to the delay from the HDMI video input at the transmitting end to the HDMI video output at the receiving end, 不含发送端前端摄像头延迟 (we measured the delay of a brand SLR camera at about 70 毫秒, and the delay of a famous brand sports camera at about 130 毫秒). For most application scenarios, the video delay is set to about 200ms by default.

When the COFDM-905T transmitter and the COFDM-905R receiver form a point-to-point wireless video transmission system, the transmission distance is:
The wireless transmission distance is related to many factors such as the test environment, ambient electromagnetic interference, occlusion conditions, air humidity, 工作频率, 无线带宽, and transmitting and receiving antennas. Actual test results: a customer test, unmanned aircraft-mounted ST100 transmitter to fly about 100 米高, set to 4M QPSK wireless bandwidth, 700MHz center operating frequency, 1W 发射功率, transmitter antenna 3dBi around, Receiving double glass fiber antenna gain of about 10dBi, the distance of up to 16km (video smooth); our own road test in Shenzhen, the launch end on the flyover, ordinary hose antenna (about 3dBi gain), 340MHz launch, QPSK 8M Bandwidth, a fiberglass antenna at the receiving end, and a Yagi antenna, 关于 2.2 meters high on the pole, 2.2 公里外, high-definition video smooth, a small number of high-rise buildings between the transmitter and receiver, the road visually about 20 degrees bending. Due to conditional restrictions, no further road tests were made.

连接器

尺寸

75 X 55 X 25 毫米

射频性能测试

工作中心频率 470MHz, 功率放大器: 1W¯¯

工作中心频率 700MHz, 功率放大器: 1W¯¯

升级

How to upgrade TX from 720P to 1080P?