SSTV

Slow-Scan Television (SSTV) is a relatively narrow-band, slow-transmission image mode used by amateur radio operators. It is designed to transmit still images or slow-moving video over radio frequencies where bandwidth is limited, such as those typically used by amateur radio. Unlike conventional television which transmits many frames per second, SSTV transmits images over a period of several seconds to several minutes per image. This significantly reduces the required bandwidth.

The transmission of an SSTV image involves encoding visual information into an audio signal. This audio signal is then transmitted over a standard voice radio channel. The receiving station captures this audio and decodes it back into a visual image. There are various SSTV modes, each with different transmission speeds, resolutions, and color capabilities. Some common modes include Robot, Martin, and PD. The choice of mode depends on factors such as desired image quality, available bandwidth, and the capabilities of the transmitting and receiving equipment. SSTV is a popular activity among amateur radio enthusiasts, allowing them to share images of their surroundings, equipment, or personal interests across long distances.