COFDM Wireless Video Receiver HDMI cvbs output mini modulator module RX long distance fpv uav

COFDM Wireless Video Receiver HDMI CVBS output

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

Work for COFDM-905T

 

HD digital wireless video transmission receiver COFDM-905R
Built-in Decoder board and COFDM dual-antenna receiving demodulation module, the whole machine adopts aluminum alloy casing, high receiving sensitivity, low decoding display delay, high-definition video output stable and clear.

特徵

1. Dual Antenna reception
2. Support working frequency range: 160兆赫~860兆赫, the center working frequency can be configured;
3. Wireless bandwidth is configurable;
4. The sensitivity of dual antenna reception -100±1dbm (QPSK 8MHz);
5. Wireless receiving status information (such as received signal strength, 空中接口速率, data rate, 工作頻率, 無線頻寬, etc.) can be superimposed/not displayed on the video screen through the OSD switch button, or output to the serial port (客製化) ;
6. Low-latency H264 video decoding, support 1080P@60 decoding playback;
7. Audio and video output (HDMI, CVBS, USB port simultaneous output):
   1. HDMI Type-A port audio and video output
   2. CVBS (Lotus Head) AV音視訊輸出
   3. Output video stream to the phone/tablet decoding display via USB port
8. Support video receiving and decrypting function (matching with video encryption at the transmitting end);
9. Support TF card or USB disk video recording;
10. Provide one-way single-direction transparent data transmission serial port;
11. Provide parameters to configure the serial port for working settings (such as center working frequency, 無線頻寬, receiving decryption password);
12. 電源: 6～15V, working power consumption is 230mA@12V.
13. Machine size: 115x90x34mm
14. Machine weight: 243 克

連接器:

1. ANT-in: wireless signal input antenna interface, SMA external threaded inner hole
2. HDMI: A type HDMI carrier, high-definition audio and video output interface
3. CVBS: analog video output interface
4. AL/AR: left and right channel analog audio output
5. 功率 連接器: 3PIN 2.54mm socket
6. USB 介面:
   1. External phone or tablet can be used to output audio and video to mobile phone or tablet for decoding display
   2. Recording video can be connected to an external USB flash drive or USB hard disk
7. OSD按鈕:
   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. 射頻：338.0兆赫頻寬：4.0兆赫
      四相相移鍵控CR：2/3 胃腸道：1/16
      空氣：3.90Mbps的
      可變位元速率：3.05Mbps AES 關閉
      SIG1：27 SIG2：22
      ber1：0.14% ber2：100.00%
      錄製關閉 無存儲
   2. 射頻 indicates the center operating frequency, 和 體重 indicates the working bandwidth.
      QPSK is the modulation mode, CR是卷積碼率, GI是保護間隔.
      空氣 is the air interface rate
      可變位元速率 is the video bitrate, AES OFF means no encryption
      SIG1 refers to the received signal strength near the HDMI port antenna, 和 SIG2 refers to the other antenna.
      Ber1 refers to the BER error rate near the HDMI port antenna, 和 ber2 refers to another antenna.
      REC OFF means no video storage
8. When the wireless receiving signal is interrupted or weak, 輸出視訊螢幕將會中斷 (重新接收訊號畫面將自動恢復), and display: Disconnected, 無訊號
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. 如果沒有插入TF卡, 它被記錄到USB隨身碟. 如果沒有插入, 他們不會被記錄.
10. 連結指示器: 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: 電源指示燈.
13. CFG serial port: Parameter configuration Serial port, you can configure wireless receiving related parameters, such as center working frequency, 無線頻寬, decryption password, 等等. Vcan provides a matching parameter configuration panel SconB to facilitate user parameter setting.
14. Data serial port: 串列資料透明傳輸. The serial port data of the transmitter can be wirelessly transmitted to the receiver and output from the serial port.
15. TF卡介面: 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. 在這種情況下, the actual test is that the video delay is about 60 milliseconds when the code is transmitted at 720P@60, and the video delay is about 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, 不含發送端前端攝影機延遲 (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, 工作頻率, 無線頻寬, and transmitting and receiving antennas. Actual test results: a customer test, unmanned aircraft-mounted ST100 transmitter to fly about 100 meters high, set to 4M QPSK wireless bandwidth, 700MHz center operating frequency, 1W 發射功率, 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, about 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.

連接器

尺寸

75 x 55 x 25 毫米

RF Performance Test

Operating Center Frequency 470MHz, Power Amplifier: 1W¯¯

Operating Center Frequency 700MHz, Power Amplifier: 1W¯¯

升級

How to upgrade TX from 720P to 1080P?