![]() ![]() This is why a bent video antenna usually has worse signal than a brand new one. The VRX measures the voltage across the antenna and decodes or demodulates it to recover the PAL or NTSC analogue FPV video feed that was sent to the VTX.Īntennae technically pick up every frequency transmitted but the size and shape of the antenna ‘tune it’ to be more sensitive to some frequencies over others. This is because voltage and current are linked by the ‘voltage = current * resistance’ formula. Because the current through the receiving antenna is changing, the voltage across the antenna will also be changing. This changing current flow closely mimics the changing current flow going through the VTX antenna. This antenna receives the transmitted radio waves. When the VRX antenna receives the radio waves containing the encoded analogue FPV video feed, the radio waves moving across the VRX antenna creates a changing current flow through it. The video receiver (VRX) also has an antenna mounted to it. By changing the current flowing into the antenna around 5,800,000,000 times per second, the radio waves will mimic these changes and propagate out at the chosen video frequency within the 5.8GHz band. The current flowing through the antenna produces an electromagnetic field or radio wave around it. This radio wave can then be picked up by a set of FPV goggles where the live analogue FPV video feed can be viewed.įor the VTX to form a radio wave, a current must be run through a wire known as an antenna. The VTX transmits the analogue FPV video signals into the air as a radio wave by amplifying the encoded FPV video signals and passing them through the antenna. The process of translating/encoding the analogue FPV video signals from the camera into a radio wave is known as modulation. An example of a video frequency is Fatshark channel 1 which has a frequency of 5740 megahertz (MHz) or 5.74 gigahertz (GHz). Frequencies around the 5.8 gigahertz (GHz) band are the most common for analogue FPV video feeds. ![]() The job of the VTX is to take the electrical video signals from the camera and to translate them into a radio wave at the desired video channel frequency. The analogue FPV video signal is then fed along a video wire to the video transmitter. The FPV camera translates light hitting its sensor into a PAL or NTSC format analogue FPV video signal. But, how does this analogue FPV video feed actually work? Well, glad you asked, this article will discuss just that and provide you with an overview of what is going on behind the scenes whilst you rip through the sky! And in regards to the Clearview’s magic, I will try to explain a portion of that too. Basically, an FPV camera sends images to the video transmitter (VTX) which is then wirelessly transmitted to a set of FPV goggles and observed by the pilot. The most crucial aspect of first person view (FPV) racing is arguably the analogue FPV video feed which allows pilots to observe a live view from the front of their craft. ![]()
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