Not sure what the protocol is in your part of the world, but here in the
US, we typically make voice contact with the station that sent the picture
before we send one of our own. Unlike analog SSTV where stations are sending on
top of stations when things get busy.
Over here, when the band opens and we have multiple stations wanting to
send pictures, we start sort of a net and then go down the list giving each a
turn. That way we get more probablity that the pictures will be received.
We also use Digi-Sites and Digi-Cams to assist our pictures. on Digi-Sites
you can program your front page with stations that normally copy your pictures.
In my case I have east coast, Florida, west coast and NE stations, so if I don't
copy the picture myself, I can see it on Digi-Sites. With Digi-Cams, you can see
other stations virtual camera's and you can see if someone is sending that you
may not be able to copy. The programs can be found at http://www.w3wvg.com/
. Dick has some other programs like
sstvPics that are usefull in managing your pictures for both sending and
receiving and it works directly with EasyPal.
One other thing, we don't send many CQ pictures like on analog SSTV. We
usually ID in the waterfall so others know we are around but with the net type
format there is not much need for CQ. Maybe we will work one of these days. We
hang out around 14.233 most days.
Hope this is helpful