Narrow-Bandwidth Television Association

Hi guys,

that folder is here:

https://schematicsforfree.com/files/Vid ... elevision/

Code: Select all

1981 Video Technology.jpg                          13-Jul-2023 01:11    936K
40 Years of TV by Hugo Gernsback.pdf               01-Nov-2022 12:52    138K
A Historical Look at Television (2).pdf            01-Nov-2022 12:52      2M
A Historical Look at Television.pdf                01-Nov-2022 12:52      2M
Ad For My First Vcr - Rca Vct200 In 1978.pdf       01-Nov-2022 12:52    123K
Captioning - The Inside Story.pdf                  01-Nov-2022 12:52    838K
From TVs Tender Years.pdf                          01-Nov-2022 12:52      1M
John Logie Baird & the early days of TV.pdf        19-Oct-2022 00:07      4M
Television 50th Anniversary Part 1 SC 2006-06.pdf  27-Sep-2022 03:31      2M
The Future of TV in the USA - 1949.pdf             01-Nov-2022 12:52    398K
Thirty Years of Canadian TV - 1982.pdf             01-Nov-2022 12:52      3M
Was Baird Fooling the Public.pdf                   01-Nov-2022 12:52     47K
Whatever Happened to TV Channel One.pdf            01-Nov-2022 12:52      2M


I went a bit around this site and there are also two interesting SSTV related articles:

This one has schematics for 8255 parallel interface card related to Weather Satellite Receiving System:
https://schematicsforfree.com/files/Rad ... 995-04.pdf

Extensive build plan for digital scan-convertor (Picture Phone) with some kind of 15sec SSTV mode:
https://schematicsforfree.com/files/Rad ... 201982.pdf

The 'Picture Phone' item is interesting, but really needs updating. I'm tempted to have a go at it if others are also interested. These days chip count and power consumption could be noticeably reduced. The 15-second mode mentioed and is non-standard and would be replaced with selectable US/EU rates. 128-lines in 8.53 seconds (US, 60Hz/4), or 128-lines in 7.68 seconds (EU, 50Hz/3). This is a monochrome device as per the original article. Other 'features' could be added, suggestions welcome.

However camera selection is an important consideration in all this....or files could be loaded from a PC via USB, (probably better quality), and doesn't require the fast A-D that live FSTV 525/625 signals require.

Steve A.

Interesting to note that the prototype shown in the article looks very much like an early (maybe prototype version) of a Robot device. The 'looks' of it has the general 'feel' of a Robot unit, same font, knobs etc. Maybe that's what the author was trying to achieve?

If there's interest in this I'll start off a new thread in the SSTV section.

An 'addition' might be a switchable interface to an Amateur Transceiver and/or a phone line.