[aprssig] Fast SSTV for on-air presentations

[Lynn W Deffenbaugh (Mr)]

Mr, APRS,

Have you heard of this one? https://github.com/DL7AD/pecanpico9

> Other than usual position tracker, this tracker has also the ability 
> to take pictures with a camera and send them to the ground. The 
> tracker can use RTTY/SSDV to transmit those to the ground. While RTTY 
> can only be received directly, this tracker can also use APRS/SSDV. 
> Therefore SSDV has been integraded into the APRS protocol. This new 
> protocol allows the user to receive pcitures by using their APRS 
> receiver and a computer. There is no tuning required, so everything 
> could work autonomously. APRS has been integrated for the image 
> transmission in respect to be used on the global APRS network itself. 
> So images can be received from far away using the Igating service. 
> Image packets may be received somewhere else by Igates and relayed 
> through the internet. The APRS image transmission could be also used 
> to make use of 9k6 APRS. 9k6 APRS transmits the images very fast. VGA 
> sized pictures can be transmitted within minute. While the protocol 
> doesn't change, using this technique doesn't need any changes rather 
> than the decoding equipment.

I've been trying to get a round to implementing this protocol into my 
APRS clients.

And if the operators have the radio/PC interface to receive SSTV, they 
can certainly install DireWolf and an APRS client to receive and decode 
APRS.  Or just tap into the APRS-IS, if conditions permit.

Or look into NBEMS which can do file transfers over repeaters at a 
reasonable speed.  Our local club had training on this and were using it 
to send small files over the repeater at the end of our weekly check-in 
nets.  NBEMS is nice because it can be accomplished with acoustical 
coupling. Just hold the radio near the PC microphone (or vice versa to 
transmit) and boom, file is received (or transmitted).  NBEMS also 
includes error correction and all-or-nothing reception indication.  If 
using NBEMS, I'd suggest sending one picture per page of the PPT just to 
make the retries quicker.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

PS.  Here's a sample picture from the PECAN tracker:

Train station

Airport Berlin Tempelhof





On 5/4/2020 12:45 PM, Robert Bruninga wrote:
> The local radio club wants to move to on-line technical talks but got 
> bogged down in arguments over teleconferingin  protocols and security..
>
> I's like to transmit my presentation as SSTV FAST mode (13 seconds per 
> slide) and give the talk on the local repeater.  The FAST FM mode 
> premiered in the (decades ahead of its time) Kenwood VC-H1 And 
> generally has to connect to the modulator and discriminator and not 
> the voice circuits.
>
> Has anyone used FAST FM mode for SSTV?  Can it be received by most 
> folks without having to get to the discriminator for receive?
>
> I'm thinking of transmitting the image on the UHFrepeater and the 
> "talk" on the VHF colocated club repeater.
>
> This would be a great way to do ham club meetings duging COVID, bad 
> weather, etc.
>
>  In fact a great end-use software could be developed so that at the 
> prescribed time, the entire Power Point presentation could be 
> transmitted continuously, and be assembled on receipt and then Viewed 
> at the presenters speed. This would not introduce 13 second per slide 
> delays, but could in fact, send the entire 50 slide PPT presentation 
> in 10 minutes prior to the scheduled talk.
>
> And for near real time, the slide transmission need only begin say 1 
> minute early and still be able to remain ahead of the presentation speed.
>
> Ham Radio should have this toolbox!  (probably already does and i 
> missed it)
>
> The most important thing is that the images should be able to be 
> received by almsot any radio and any SSTV software on hand... thought 
> not the advanced features.
>
> Comments and experiences welcome...
> Bob, WB4aPR
>
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