Los cvbs video inalámbricos del receptor HDMI de COFDM entraron el mini módulo modulador RX de larga distancia 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.

Características

1. Dual Antenna reception
2. Support working frequency range: 160MHz~860MHz, 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, air interface rate, tasa de datos, frecuencia de trabajo, ancho de banda inalámbrico, etc.) can be superimposed/not displayed on the video screen through the OSD switch button, or output to the serial port (customized) ;
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) Salida de audio y vídeo AV
   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, ancho de banda inalámbrico, receiving decryption password);
12. Fuente de alimentación: 6~15V, working power consumption is 230mA@12V.
13. Machine size: 115x90x34mm
14. Machine weight: 243 gramos

Conector:

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. Fuerza conector: 3PIN 2.54mm socket
6. USB interfaz:
   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. Botón OSD:
   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. RF：338.0MHz ancho de banda：4.0megahercio
      QPSKCR：2/3 soldado americano：1/16
      AIRE：3.90mbps
      VBR：3.05Mbps AES desactivado
      SIG1：27 SIG2：22
      ber1：0.14% ber2：100.00%
      REC APAGADO Sin almacenamiento
   2. RF indicates the center operating frequency, y peso corporal indicates the working bandwidth.
      QPSK is the modulation mode, CR es la tasa de código convolucional, y GI es el intervalo de guardia.
      AIRE is the air interface rate
      VBR is the video bitrate, AES APAGADO means no encryption
      SIG1 refers to the received signal strength near the HDMI port antenna, y SIG2 refers to the other antenna.
      Ber1 refers to the BER error rate near the HDMI port antenna, y ber2 refers to another antenna.
      REC OFF means no video storage
8. When the wireless receiving signal is interrupted or weak, la pantalla de salida de vídeo se interrumpirá (la pantalla de señal rerecibida se restaurará automáticamente), and display: Disconnected, no signal
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. Si la tarjeta TF no está insertada, se graba en la unidad flash USB. Si no están insertados, no serán grabados.
10. Link indicator: 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: Power Indicator.
13. CFG serial port: Parameter configuration Serial port, you can configure wireless receiving related parameters, such as center working frequency, ancho de banda inalámbrico, decryption password, etc.. Vcan provides a matching parameter configuration panel SconB to facilitate user parameter setting.
14. Data serial port: Puerto serie de transmisión de datos transparente. The serial port data of the transmitter can be wirelessly transmitted to the receiver and output from the serial port.
15. Interfaz de tarjeta TF: Used for software upgrade maintenance or for storing video.

Nota

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 the mutual influence and mutual restraint. When the air interface rate is greater than 5 times the video code rate, the video delay is minimum. In this case, the actual test is that the video delay is about 60 ms when the code is transmitted at 720P@60, and the video delay is about 130 ms 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, excluyendo el retraso de la cámara frontal del extremo transmisor (we measured the delay of a brand SLR camera at about 70 EM, and the delay of a famous brand sports camera at about 130 EM). 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, frecuencia de trabajo, ancho de banda inalámbrico, and transmitting and receiving antennas. Actual test results: a customer test, unmanned aircraft mounted ST100 transmitter to fly about 100 metros de altura, set to 4M QPSK wireless bandwidth, 700MHz center operating frequency, 1W transmit power, transmitter antenna 3dBi around, Receiving double glass fiber antenna gain of about 10dBi, 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 kilometers away, high-definition video smooth, a small amount 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.

Conector

Tamaño

75 incógnita 55 incógnita 25 milímetros

RF Performance Test

Operating Center Frequency 470MHz, Amplificador de potencia: 1W.

Operating Center Frequency 700MHz, Amplificador de potencia: 1W.

Mejora

How to upgrade TX from 720P to 1080P?