JA0BZC K6AEP COLOR SSTV QSO NHK-NEWS 1982/6/30

Forum for discussion of SSTV topics. Slow Scan television (SSTV) is a picture transmission method used mainly by amateur radio operators, to transmit and receive static pictures via radio in monochrome or colour.

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JA0BZC K6AEP COLOR SSTV QSO NHK-NEWS 1982/6/30

Postby Harry Dalek » Sat Mar 24, 2018 10:22 pm

I think this fellows wife was very tolerant of he's hobby !
Interesting seeing the sstv at that time .
https://viyoutube.com/video/pkIChL-JNQY ... 01982/6/30
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: JA0BZC K6AEP COLOR SSTV QSO NHK-NEWS 1982/6/30

Postby Klaas Robers » Sun Mar 25, 2018 3:47 am

This is indeed SSTV over short wave. The FM-signal is quite distorted due to the reflections in the ionosphere. However without those reflections there would have been no signal at all.

In the very beginning there were experiments done with the video signal modulating a tone in amplitude (AM), but that gave even more distortions in the received video signals. So Cop McD switched to Frequency Modulation of the tone. It is by accident that speech, transmitted in SSB, is not so much affected by the ionospheric reflections and imperfections. That is to say: it is affected, but we don't hear it, the speech is still understandable.

But it is good to see that in 1982 still the 120 line standard was used. 1982 was also the year of the emerging IBM compatible PC, so the computer modes of SSTV, in colour and with more lines, were just to come.
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