Spectrum analysis of a SSTV signal received from a local station. A cursor sits at 2757Hz; showing the signal there is at -78.9 dB. The spectrum shows strong peaks at the usual SSTV frequencies: 1.5~2.3kHz (channel signal) and 1.1~1.3kHz (FSK VIS data). There's significant spectral density between 500Hz and 2.5kHz.
Spectrum plot of https://en.wikipedia.org/wiki/File:Qpsk31wiki.wav There's a big spike at 1kHz with most of the energy being between ~900Hz and ~1.1kHz. So call it 200 Hz wide.
Had a silly thought with SSTV just now, thinking abut the whole issue with AltText.
There are two SSTV bots that I know of, operating here on the fediverse. @aregsstv and @vk4msl_sstv.
One provides a generic "static" alt text, the other provides […]
[Original post on mastodon.longlandclan.id.au]
