Narrow-Bandwidth Television Association

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Copthorne McDonald's SSTV system.

Where it all started as far as most are concerned and saw heavy use from the 60s through to the 80s. Colour and Hi-res modes have unfortunately pushed this system into the backwaters of SSTV. Time to resurrect interest in this simple analogue system.
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Copthorne McDonald's SSTV system.

Postby Steve Anderson » Wed Feb 22, 2017 2:37 pm

Copthorne McDonald was the man that gave the world SSTV. Originally an AM modulated sub-carrier was used but it was quickly found that a FM-based system was better immune to fading and interference on the HF Amateur bands. This system was in use from the 60s through to the 80s and there are still a few around who have an interest in this simple to implement analogue mode. If you have an interest in this or just curious have a browse around as the threads develop. It's worthwhile having a look in the "Reference and Archive" section for explanation as to how this all works and perhaps some inspiration.
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Steve Anderson
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Re: Copthorne McDonald's SSTV system.

Postby Harry Dalek » Sat Feb 25, 2017 8:30 pm

Copthorne McDonald
Hope they can be used here.....
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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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Harry Dalek
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Re: Copthorne McDonald's SSTV system.

Postby Harry Dalek » Sat Feb 25, 2017 8:37 pm

Copthorne McDonald
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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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Harry Dalek
"Fester! Don't do that to 'Thing'"
 
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Joined: Fri Sep 26, 2008 4:58 pm
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