Transmissions carry a station's callsign, Maidenhead grid locator, and transmitter power in dBm. WSPR implements a protocol designed for probing potential propagation paths with low-power transmissions. To test propagation paths on the MF and HF bands. The program isĭesigned for sending and receiving low-power transmissions Is now open source and is developed by a small team. The program was initially written by Joe Taylor, K1JT, Weak-signal radio communication between amateur radio operators. WSPR (pronounced 'whisper') stands for 'Weak Signal Propagation Reporter'. Helpfull tutorials The Wonderful World of SSTV

In other words, the signal frequency shifts up or down to designate brighter or darker pixels, respectively.Ĭolor is achieved by sending the brightness of each color component (usually red, green and blue) separately.Ī feed of my last receved SSTV images can be viewed from the live feed link above. Uses analog frequency modulation, in which every different value ofīrightness in the image gets a different audio frequency. It is a much slower method of still picture transmission, usually taking from about eight seconds to a couple of minutes,ĭepending on the mode used, to transmit one image frame. (in the NTSC, PAL or SECAM color systems), but SSTV usually only takes up to a maximum of 3 kHz of bandwidth.

A technical term for SSTV is narrowband television.Īnalog broadcast television requires at least 6 MHz wide channels, because it transmits 25 or 30 picture frames per second The most popular modes of SSTV are Robot, Scottie, and Martin.

Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images.

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