dnet / pySSTV

Python classes for generating Slow-scan Television transmissions
https://pypi.python.org/pypi/PySSTV
MIT License
138 stars 27 forks source link

Scottie S2 encodes only the first half of the image #38

Open sjlongland opened 3 months ago

sjlongland commented 3 months ago

I think the WIDTH = 160 in color.py is in error for Scottie S2.

I responded to a SSTV station in VK7 who had sent something in this mode, and it had been received just fine via slowrx.

2024-07-27T00-17Z-S2-VK7NMH-orig

(Upload as a MP4, because Github is too cool for just plain audio) https://github.com/user-attachments/assets/5081cfce-d79a-4590-9951-79734b55605a

I tried sending a response back, and this is what got encoded (and decoded) 2024-07-27T00-49Z-S2-VK4MSL-orig

https://github.com/user-attachments/assets/039bbb25-4433-4059-bb2a-11d71b724274

RXSSTV also mis-decoded it: 20240727005017-P2

I'll have a look and see if we can't get a better encoding in the S2 mode.

sjlongland commented 3 months ago

Ahh, much better… 20240727012011-P2