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Skills of using COFDM gusset-type wireless image transmission
Skills of using COFDM gusset-type wireless image transmission
1. When placing the antenna outdoors, the small distance from the wall is 1 meter.
2. If the receiving direction is predicted, the directional antenna used by the receiver can greatly increase the transmission distance, but the direction of the transmitting front end is changing at any time due to its mobile usage. Generally, the directional antenna is not used.
3. The system can use an auto-iris camera. If you use a monochrome camera, the image resolution will be much higher than that of a color camera (the image is very sharp), because there is no color coding process, and all bandwidth is used for grayscale Image processing.
4. Indoors, you can try to move the antenna slowly, you may find that it has a very good reception effect in some locations. This is because the intensity of electromagnetic waves changes periodically with the wavelength.
5. COFDM buckle-type wireless image transmission When you put the receiver outdoors and behind a glass window (glass windows can generally reflect about 30% of the energy), the system coverage may be larger.
6. A car is close to a "Faraday" potential, which is equivalent to about 20% to 30% of the transmission power left in the car. At this time, try to move the antenna outside the car, open the window and bring the antenna as close as possible Car window.
7. In order to make the diversity receiving effect better, please try to extend the distance between the two receiving antennas of the diversity receiver.
8. Please set the antenna height of the transmitter and receiver as high as possible. The higher the antenna position, the longer the transmission distance.
9. Try not to use long feeder cables to connect the antenna to the transmitter or receiver, so that the power of the antenna will be very attenuated. If you want to extend the distance from the antenna to the camera or monitor, you can only extend the video cable, if you use RG59 The video line from the receiver or transmitter can only reach 50 meters away.