~~NOTOC~~
====== Slow Scan TV ======
From [[wp>Slow-scan_television |Wikipedia: Slow-scan Television]]:
<WRAP indent>
> Slow Scan television (SSTV) is a picture transmission method used mainly by amateur radio operators, to transmit and receive static pictures via radio in monochrome or color.
>
>[SSTV] 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.
>
>Since SSTV systems operate on voice frequencies, amateurs use it on shortwave (also known as HF by amateur radio operators), VHF and UHF radio. 
</WRAP>

===== Android =====
The easiest way to start playing SSTV is to install [[https://play.google.com/store/apps/details?id=xdsopl.robot36 |Robot36]] to receive and (optionally) [[https://play.google.com/store/apps/details?id=om.sstvencoder |SSTV Encoder]] to send.

To test this off the air, use a phone with SSTV Encoder to "transmit" the picture as sound via the speakers, while a second phone with Robot36 listens and decodes the image.

To decode SSTV transmitted over the air, do the same thing: have your phone with Robot36 listen to the radio speaker and you'll see the image load.


===== Computer =====
The previous method is the most basic and is subject to noise from the environment.  A better way of receiving and transmitting is to send the audio from the radio straight to a computer.

With the [[howto:signalink |SignaLink]] already installed and configured, the only other step is to install a program like [[https://hamsoft.ca/pages/mmsstv.php |MMSSTV]]
{{ :howto:sstv:sstviss.png }}


===== ISS =====
From time to time, the International Space Station transmits pictures on 145.800 MHz.  To find out where the ISS is, the Android app [[https://play.google.com/store/apps/details?id=uk.me.g4dpz.HamSatDroid |AmsatDroid]] is excellent.  More information about SSTV from the ISS, can be found on [[https://amsat-uk.org/beginners/iss-sstv/ |amsat-uk.org]].

Here's a picture that VA7FI received from the ISS on Jan 1, 2020 at 7:27 :
{{ :howto:sstv:202001011527.jpg }}