![]() Qsstv is a Linux utility for turning SSTV signals into images and vice-versa. Slow Scan Television from charlesreid1 on Vimeo. Or watch SSTV in action in the video below: You can find a sample of what slow scan TV signals sound like here: Slow scan TV was also utilized during the Apollo lunar missions. The technology dates back to 1968, when amateurs were first granted spectrum space to do slow scan TV. This makes it easy to receive an SSTV signal with a VHF radio and pipe it over to a sound card for slow scan TV software to take over. You can use existing equipment and radio transceivers designed for SSB voice signals at a bandwidth of 3 kHz. SSTV is also cheaper - you aren't operating microwave transmitters and drawing thousands of watts to transmit your signal. ![]() This saves a huge amount of spectrum space, making this mode usable on lower frequencies (HF/VHF) and not just restricted to higher frequencies. Why is this a big deal? First, because normal, moving television images require signals with a bandwidth 2,000 times larger (6 MHz). ![]() It is essentially a translation of image data into audio tones that can be transmitted over the radio, and then back into images. It transmits images using a very narrow bandwidth, approximately the same as a single sideband (SSB) voice signal - 3 kHz. SSTV is a method for transmitting images that was pioneered by ham radio operators.
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