سؤال: لماذا هناك بعض “تظهر شاشة سوداء” بعد استخدام وحدة تشويش الفيديو FPV?
إجابة: ال “black screen appears” has nothing to do with our video scrambler. Is the analog video transmission signal interfered with?
عميل: لا.
نعم فعلا, بالطبع, there is some interference. It’s used at long distances, about 5 كم. But there is also the situation when it is just nearby in the house.
Video when it has interference and this concerns the video transmitter. This is expressed by interference on the screen, but not a black screen.
iVcan:
According to our engineer, The black screen appears because the receiver does not output video. The receiver does not receive the video signal from the transmitter. After digital scrambling, the black screen appears. When the receiver receives the video, it will reappear.
If the black screen appears frequently, it means that the power ripple is too large and a capacitor filter is needed at the power supply end to the scrambling module.
Another important point is that the video ground wire needs to be connected separately. The video ground and power ground are not connected together. Connecting them like this will affect the video quality and cause stripes.
When there is no signal, snowflakes appear without scrambling, and a black screen appears with scrambling. في الحقيقة, it is the same, إنه, no video appears.
Your customer’s current connection method is to use the ground wire of the public power supply. My engineer means that the power ground wire and the video ground wire on the board should not be together, they are independent ground wires.
There are two possibilities from your below video. أولاً, the flight control supplies dirty power, with poor ripple or voltage stability. ثانية, the descrambling module supply voltage is not high, lower than 5V.
From the below video picture, we can see that the video transmission equipment has always been in an unstable state, and the snowflakes are very serious at a certain point in time.
عميل: You mean. When there is no signal from the transmitter, the black screen is showing, instead of the snowflakes without the FPV Video scrambler module.
iVcan: نعم فعلا.
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