SSTV lets you decode and display SSTV (Slow Scan TV) transmissions on your iPad.
Just connect it to an HF radio
(or even set it next to the radio's speaker), tune
in an SSTV frequency, and watch the pictures.
A quick tour of the controls:
When Auto Start is turned on, the app will detect the start of an SSTV transmission, and begin
decoding the image.
When Auto Mode is turned on, the app will decode the VIS code sent at the beginning of the
transmission, and set the SSTV Mode. When off, it will use the current mode.
When Auto Save is turned on, decoded images will be saved to the Documents folder for the app.
You can then use iTunes to retrieve these images from your computer:
You can also email a saved image. When viewing the image, tap the Email button, and fill out the
recipient's email address, then tap send.
- Go to iTunes, and select your device from the DEVICES list at the left
- Click the Apps tab
- Under File Sharing, select SSTV from the list of Apps
- All of the saved pictures will be under SSTV Documents. You can Save them to your computer,
or delete them
The Manual Start and Manual Stop buttons can be used to start and stop decoding an image. This can be
handy if the signal is weak, and the app couldn't detect the start of transmission.
You can manually select the SSTV mode. Tap the mode button, and select the new mode.
If you're already decoding an
image, previous audio will be re-decoded for the new mode. This is handy if you need to
manually set the mode due to poor signal conditions, or when you manually start decoding.
The Phase slider is used to slide the image left and right, and is normally used when decoding was
manually started, since it is likely that the decoding wasn't started at exactly the correct time,
and there is an offset. The Center button can be used to re-center the phase to the default value.
You can also use your finger to adjust the phase. Just touch the decoded image, and move back and
forth to adjust it
The Skew slider is used to adjust the skew or slant of the image, and is used to compensate for
timing differences between the sending station and this app.
The Center button can be used to re-center the skew to the default value.
You can also use your fingers to adjust the slant. Touch with two fingers, and move up and
down to adjust the skew.
To use this app, you need to feed the audio output from a your radio into the device.
You can do this via one of several ways:
You can use the volume indicator in the upper right corner to verify that audio is getting into
your device, and that the volume level is appropriate.
- Set the device near the radio's speaker to pick up the audio. While easy to do,
this is not ideal, as background noise can interfere with the audio, causing garbled decodes.
- Plug headphones into the radio, and set one earphone near the mic. I find that with good
quality headphones, this can work extremely well.
- Use the microphone input jack of your device, by obtaining an appopriate cable and
connecting the radio's line level output to the microphone input.
- With the Camera Connection Kit, you can plug a USB sound input device into the iPad, and use
a patch cable between it and the radio's audio output. This is by far the best solution.
If you are running iOS 7 or later, be sure to give the app permission to use the
microphone. If you denied permission, you can always give it again by following
- Open Settings app and go to "Privacy"
- Select "Microphone" to get a list of all apps that have requested access to the microphone, and to control which apps have access to the microphone
If you're looking for a radio to use with the app, there are many different types to choose from.
Take a look at our
listing of radios to use with your app, to see several, along with some
suggestions on how to choose a radio.
Here are some details on
directly connecting an audio line source to your iPad/iPhone/iPod Touch