COFDM 無線視訊接收器 HDMI cvbs 輸入迷你調變器模組 RX 遠距離 fpv 無人機

COFDM Wireless Video Receiver HDMI CVBS output

COFDM 無線視訊接收器 HDMI CVBS 輸出迷你調製器模組遠距離 fpv 無人機資料傳輸 UART 配置記錄器

Work for COFDM-905T

 

高清數位無線圖傳接收器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, air interface rate, 數據速率, 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 (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口音視訊輸出
   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-輸入: 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: 左右聲道類比音訊輸出
5. 力量 連接器: 3PIN 2.54mm 插座
6. USB 介面:
   1. 可外接手機或平板輸出音視頻到手機或平板解碼顯示
   2. Recording video can be connected to an external USB flash drive or USB hard disk
7. OSD按鈕:
   接收狀態訊息顯示開/關按鈕, 長按按鈕可以切換開關狀態, 且開關狀態為斷電. When the reception status information display is turned on, 它在輸出視訊螢幕的左上角顯示為紅色:
   1. 射頻：338.0兆赫頻寬：4.0兆赫茲
      四相相移鍵控CR：2/3 胃腸道：1/16
      空氣：3.90Mbps
      可變位元速率：3.05Mbps AES 關閉
      信號1：27 訊號2：22
      誤碼率1：0.14% 誤碼率2：100.00%
      錄製關閉 無存儲
   2. 射頻 表示中心工作頻率, 和 體重 表示工作頻寬.
      四相相移鍵控 是調製模式, CR是卷積碼率, GI是保護間隔.
      空氣 是空中接口速率
      可變位元速率 是視訊比特率, AES 關閉 意味著沒有加密
      信號1 指HDMI埠天線附近的接收訊號強度, 和 訊號2 指的是另一個天線.
      貝爾1 指HDMI埠天線附近的BER誤碼率, 和 誤碼率2 指另一個天線.
      錄音關閉 意味著沒有視頻存儲
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), 並顯示: 已斷開連接, 無訊號
9. 錄音按鈕: 錄影開/關按鈕, 短按按鈕切換狀態, 偵測到電源後開始錄音. 系統預設錄製到TF卡. 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: 無線接收連結工作狀態指示燈系統啟動後亮起，接收訊號正常時閃爍.
11. 錄音指示燈: The video recording indicator will flash at the low frequency when recording video, 否則高頻會閃爍.
12. 壓水堆指示器: 電源指示燈.
13. CFG串口: 參數配置 串口, 可配置無線接收相關參數, such as center working frequency, 無線頻寬, 解密密碼, ETC. Vcan提供搭配的參數配置面板SconB，方便使用者參數設定.
14. Data serial port: 串列資料透明傳輸. 可以將發射器的串列資料無線傳輸到接收器並從串列埠輸出.
15. TF卡介面: 用於軟體升級維護或儲存視頻.

筆記

當COFDM-905T發射機和COFDM-905T接收機組成點對點無線視訊傳輸系統時, 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, 不含發送端前端攝影機延遲 (我們測量了品牌單眼相機的延遲約為 70 多發性硬化症, and the delay of a famous brand sports camera at about 130 多發性硬化症). 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 公尺高, 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.

連接器

尺寸

75 x 55 x 25 毫米

RF Performance Test

Operating Center Frequency 470MHz, 功率放大器: 1瓦

Operating Center Frequency 700MHz, 功率放大器: 1瓦

升級

How to upgrade TX from 720P to 1080P?