Viewing digital photos on air
Reading this post from 2E0HTS Simon did give me some interest in SSTV again. Although I didn’t want to do SSTV the traditional way as the images are low quality when QRM is coming in. I heard about digital SSTV modes and discovered now that it is actually not SSTV anymore. The pictures are send digitally and so you receive them they way they were made. This is really a nice mode for someone that has photography as a hobby. So, I had some spare time today to make this digital TV or photoshow happen. I installed Easypal the most used digital SSTV program around. And started on 20m receive, I actually received something but after half a hour still didn’t see any picture. Later on I tried some TX to see if one of the online receivers could get my picture. But unfortenately my signal has not been received, till I saw another received picture online from I6IBE. He did seem to receive my picture and send one in return, but still it didn’t appear on my screen. I don’t know why? But at last I did receive some pictures on 20m mostly from Russian stations. In the evening I switched to 80m 3733KHz LSB and found a crowded frequency and lots of pictures were received. I also discovered most of these stations are using amplifiers and only a almost perfect signal can be decoded. It’s not like analog SSTV were you see noise in the picture when QRM is fading in and out. If you get QRM with digital SSTV you simply miss some bits and you don’t see the picture. There is a possebility to fix the missing parts, but from what I’ve been experiencing so far it’s seldom been used. Conclusion: it was a nice experiment although I didn’t have the time to completely figure out all possebilities of Easypal. For someone with less time for the hobby it’s nice to receive only if you like all kind of pictures. But to make QSOs you really need a lot of time. After all I had a couple of hours radio fun.
|Tnx report Ivo, unortenately didn’t receive you myself…|