[aprssig] Smartphone SSTV?

Stephen H. Smith wa8lmf2 at aol.com
Fri Jul 14 08:24:36 CDT 2017


On 7/13/2017 4:59 PM, Robert Bruninga wrote:
>
> As I pack up several VCH1 Kenwood SSTV Handhelds for Saturday’s Appalachain 
> Golden Packet event, I wonder if surely by now there is an SSTV AP for 
> smartphones?
>
> Just snap a picture, press SEND and hold the phone’s speaker up next to your 
> radio’s microphone for 40 seconds.
>
> Done?
>
> And for receipt, just let the cellphone hear the audio on receipt?
>
> Surely this exists?
>
> Bob
>

I have the Black Cat Systems  "SSTV for iOS" app on my iPod Touch and several 
iPads.  It sorta works, but leaves a lot to be desired.   It can grab an image 
direct from the camera, or use any existing pic on the device's "Camera Roll". 
Despite using the "iGadget"s rather high resolution camera, it only does the 
traditional 320x240 pixel modes.  It won't do the higher-res 640x480 or 800x600 
modes which is a shame, given the image quality of the camera.   It won't do 
the MPnn-N  500-Hz-bandwidth  narrow-band modes that are the only SSTV modes 
legal on 30 meters.    It lacks the image editing/cropping/extensive text 
overlays that Windows SSTV applications such as mmSSTV and Chromapix have.   
(You can type a single line of text at the top of the screen.)

Perversely, for an app transmitting exclusively landscape images, it runs only 
in the portrait orientation on iPods and iPhones, no matter how you hold the 
device.  This makes the view of the image being received (or being 
previewed/titled on TX) needlessly small. (On iPads, it will run in the 
landscape mode.)

I use the app through a tiny home-brew interface that is a modified version of 
the KH6TY self-powered tone-activated interface into either my TH-D72 or a 
Wouxun KG-UV-8D.  (Both have the identical Kenwood-standard speaker/mic 
pinout.)    I velcro the small interface to the back of the iPod or iPad, with 
a 3-foot cable running to the hand-held's speaker/mic connector.

By the way, about three weeks ago, I actually successfully sent and received 
live SSTV images from my TH-D72/iPod on 20 meters using the Kenwood TS-2000's  
"Sky Command" remote-control feature.



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Stephen H. Smith    wa8lmf (at) aol.com
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EchoLink:  Node #  14400  [Think bottom of the 2-meter band]
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