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Understanding the program!
1. The purpose of the system:
The system gives the user an insight into the unlicensed amateur radio - especially in the operating mode Slow Scan TV (SSTV). Licensed amateur radio operators enjoy without their own amateur radio station worldwide SSTV mode (gateway filters make it possible). Friendships, to get information and news from around the world, it is a pastime, it also does not come to the meeting place and communication with your brief. Many tech-savvy users have the same time a second hobby. It is photography! Therefore I am assuming that enough visual material (photographs) for this type of hobby is present.
2. How to use:
For the use of WWW-SSTV an imperative a free key is applied for. In general, you get on the same day the key sent by email (it can happen that it takes longer). Then, download a photo from your hard disk or from the Internet. Now you write a short QSO text that is inserted into the picture. Finally, just upload the picture. After they see the results instantly.
3. To industrial engineering:
If users simply want to share images over the Internet only, so there is not much to note. But if QSOs are sent out via gateway stations, we consider the following points:
a) your images are received by the gateway, and reduced by a factor of 4. That is: If possible, choose a font size greater than "20"
b) transmission times in the best case:
You upload your picture on the SSTV Server
After about 3 seconds, the gateway starts the download
Now, the gateway looks at the RF frequency to whether just another SSTV image is received. If not so begins the transmission of SSTV image. It takes, for example (in the fashion Martin1) 114 seconds. Now if no one else, and sends the other station is ready to respond immediately, the release also lasts 114 seconds. After 3 seconds, the gateway transmits the image to the server and your SSTV WWW-SSTV program will start the download after 3 seconds. Only now you see the pictures answer. So it can ever take a while.
If your interlocutor can respond because, for example, sends a different station as the response time is delayed for a period until the frequency is free. Should extend from your WWW-SSTV program and the Gateway unfavorable timer settings, the time, so you have to count up to 20 seconds additional delay.
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