Slow-Scan Television (SSTV)
|Frequencies||3 MHz,300 MHz|
|Frequency Range||3 MHz - 300 MHz|
|ACF||Line per minute|
|Short Description||Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images.|
|I/Q Raw Recording||Download file|
Slow-scan television (SSTV) is a method for picture transmission used by amateur radio operators to transmit and receive images. The most popular modes of SSTV are Robot, Scottie, and Martin.
A technical term for SSTV is narrowband television. Analog broadcast television requires at least 6 MHzMegaHertz (MHz) 10^6 Hz wide channels, because it transmits 25 or 30 picture frames per second (in the NTSC, PAL or SECAM color systems), but SSTV usually only takes up to a maximum of 3 kHzKiloHertz (kHz) 10^3 Hz of bandwidth. It is a much slower method of still picture transmission, usually taking from about eight seconds to a couple of minutes, depending on the mode used, to transmit one image frame.
SSTV uses analog frequency modulation, in which every different value of brightness in the image gets a different audio frequency. In other words, the signal frequency shifts up or down to designate brighter or darker pixels, respectively. Color is achieved by sending the brightness of each color component (usually red, green and blue) separately.
Sync is 1100 to 1300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).; channel information is 1500 to 2300 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)..
SSTV has been used in popular culture, including secret easter eggs in the video games Portal and Portal 2 by Valve.
- 1 Modes
- 2 Decoding Software
- 3 Encoding Software
- 4 Video Examples
- 5 Additional Links
SSTV Robot was developed by Robot Research Corporation. Used to send images over HFHigh Frequency (3-30 MHz) and VHFVery High Frequency (30-300 MHz) frequencies. The most popular modes in use today are Robot 36 and Robot 72.
|Robot 8 B/W||Robot 12 B/W|
|Robot 24||Robot 36||Robot 72|
SSTV Martin was developed by Martin Emmerson, and was originally included as a ROM enhancement for Robot Research's SSTV units. Martin mode scans 256 lines instead of the standard 240. This is usually to give HAM operators 16px of banner room above or below their image for their callsign and other text. Martin is primarily used in Europe.
|Martin 1||Martin 2|
SSTV Scottie was developed by Eddie Murphy GM3BSC, and was originally included as a ROM enhancement for Robot Research's SSTV units. Scottie mode scans 256 lines instead of the standard 240. This is usually to give HAM operators 16px of banner room above or below their image for their callsign and other text.
|Scottie 1||Scottie 2||ScottieDX|
- Hobby Level Software
- SSTV Encoder (Android)
Most common SSTV frequency is 14230 kHzKiloHertz (kHz) 10^3 Hz (USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)). When this frequency becomes busy, some activity moves to 14227 or 14233 kHzKiloHertz (kHz) 10^3 Hz. During improved propagation conditions, amateur SSTV stations operate on 21340 and 28460 kHzKiloHertz (kHz) 10^3 Hz. SSTV transmissions from the International Space Station (ISSInformation Sending Station in an ARQ link (The station sending information to the recipient). Usually the signal that's longer in duration than the short RQ (Repeat Request) bursts from the IRS.) using callsign RS0ISS take place on 145800 kHzKiloHertz (kHz) 10^3 Hz (FMFrequency Modulation) in PD120 mode.
- SSTV Transmission & Decode
- Portal Update 3/1/2010 (transmission received) SSTV and CW Morse Code
- SSTV decoding via smartphone app next to radio