Slow-Scan Television (SSTV)

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Slow-Scan Television (SSTV)
Robot 36waterfall.jpg
Frequencies 3 MHz,450 MHz
Frequency Range 3 MHz - 450 MHz
Mode USB, LSB, NFM
Modulation FM
ACF Line per minute
Emission Designator
Bandwidth 2.5 kHz
Location Worldwide
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
Audio Sample

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 signals requires 6 to 8 MHzMegaHertz (MHz) 10^6 Hz of bandwidth, because it transmits 25 or 30 picture frames per second (in the NTSC, PAL or SECAM color systems), but SSTV usually only takes up 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 to create brighter pixels and shifts down to create darker pixels. 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. It was also used in the famous entertainment site Newgrounds, for their opensource video game Friday Night Funkin. << The mode used for the resulting image was Scottie 2, and decodes to a note made by the author about how the internet has evolved along with its culture, how it was formed, etc.

The reddit article to prove this image here: https://www.reddit.com/r/FridayNightFunkin/comments/kk9j1v/the_possible_friday_night_funkin_arg/


Modes[edit]

Original Image:

BBC-Test.jpg





Robot[edit]

Description[edit]

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.

Samples[edit]

Robot Modes
Robot 8 B/W Robot 12 B/W
Sample
Robot 8 BWsample.bmp
Robot 12 BWsample.bmp
Waterfall

Robot 8 BWwaterfall.jpg

Robot 12 BWwaterfall.jpg

Robot 24 Robot 36 Robot 72
Sample
Robot 24.bmp
Robot 36sample.bmp
Robot 72sample.bmp
Waterfall

Robot 24waterfall.jpg

Robot 36waterfall.jpg

Robot 72.jpg

Additional Images[edit]

Martin[edit]

Description[edit]

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.

Samples[edit]

Martin Modes
Martin 1 Martin 2
Sample
Martin 1sample.bmp
Martin 2.bmp
Waterfall

Martin 1waterfall.jpg

Martin 2waterfall.jpg

Additional Images[edit]




Scottie[edit]

Description[edit]

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.

Samples[edit]

Scottie Modes
Scottie 1 Scottie 2 ScottieDX
Sample
Scottie 1sample.bmp
Scottie 2sample.bmp
ScottieDXsample.bmp
Waterfall

Scottie 1waterfall.jpg

Scottie 2waterfall.jpg

ScottieDXwaterfall.jpg

Additional Images[edit]




Decoding Software[edit]

Android Apps


Black Cat Software


Linux


Mac OS


Windows


Professional Equipment/Software

Encoding Software[edit]

SSTV frequencies[edit]

HFHigh Frequency (3-30 MHz) Bands
Band Freq. (kHzKiloHertz (kHz) 10^3 Hz) Mode Notes
160m 1890 LSBLower Side Band Modulation
80m 3730 LSBLower Side Band Modulation Europe
80m 3845 LSBLower Side Band Modulation
6925 USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) Pirate Transmissions
40m 7165 LSBLower Side Band Modulation Europe
40m 7171 LSBLower Side Band Modulation
40m 7180 LSBLower Side Band Modulation Proposed
30m 10132 USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) MP73N Mode Only
20m 14230 USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) Alternates:
14227 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)
14233 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)
15m 21340 USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
27700 USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) Pirate Transmissions
10m 28680 USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)

Adapted from Wikipedia

VHFVery High Frequency (30-300 MHz)/UHFUltra High Frequency (300-3000 MHz) Bands
Band Freq. (MHzMegaHertz (MHz) 10^6 Hz) Mode Notes
6m 50.680 NFMNarrowband Frequency Modulation
6m 50.950 USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
2m 145.500 NFMNarrowband Frequency Modulation
2m 145.550 USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
2m 145.600 NFMNarrowband Frequency Modulation
2m 145.625 NFMNarrowband Frequency Modulation Australia
2m 145.800 NFMNarrowband Frequency Modulation 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. Downlink
Call: RS0ISS
1.25m 223.850 NFMNarrowband Frequency Modulation
70cm 433.775 NFMNarrowband Frequency Modulation
USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Australia
70cm 430.950 NFMNarrowband Frequency Modulation
USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)

Video Examples[edit]

Additional Links[edit]