SSTV-625 Up Converter MkV (Five)...

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.

Re: SSTV-625 Up Converter MkV (Five)...

Postby Steve Anderson » Sun Apr 25, 2021 5:15 pm

R.E. Variable duration and pixel quantities...posting of last Sunday, April 18th in this thread...

Well, no-one (yet) has come forward and said, "What dumb idea." so I guess it might be a valid proposition? I can't see any reason why not...but it may come back later to bite me on the bum!

Now...how to do it? "Wench - more beers."

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Re: SSTV-625 Up Converter MkV (Five)...

Postby Harry Dalek » Sun Apr 25, 2021 9:07 pm

That's interesting the 1 and 5% resistors tests similar results or very close ,i like the idea of a few test runs just in case post or so back ...
Keep at it Steve still watching ...might be an idea to ask who else is i am sure there are others who like me can't really post due to your one of the few people who can do this so we can't help .
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: SSTV-625 Up Converter MkV (Five)...

Postby Steve Anderson » Mon Apr 26, 2021 3:43 pm

Well, this, (SSTV), is a very minority interest, so I've never expected hoards of people to be partaking or even interested. However, some of the techniques and ideas may have an application within NBTV and could be inspiration for others.

However, once this is done my next project here will be specifically NBTV themed. I've already done some unpublished work on it a while back. But this SSTV project isn't going to be done quickly, there are still a number of hurdles to overcome whilst still making it practical for others to copy/build/modify/improve.

I now have quite a bit of time to get on with this, the last nine months or so have been hectic with other things not related to our interests here. But they occasionally have a spill-over of ideas into what we do here.

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Re: SSTV-625 Up Converter MkV (Five)...

Postby Harry Dalek » Mon Apr 26, 2021 8:58 pm

Pretty much all the forum ideas are very of a narrow interest only for the connoisseur of hobbies ! :wink:
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: SSTV-625 Up Converter MkV (Five)...

Postby Steve Anderson » Tue Apr 27, 2021 3:06 pm

Nice expression! "connoisseur of hobbies"....

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Re: SSTV-625 Up Converter MkV (Five)...

Postby Steve Anderson » Thu Apr 29, 2021 3:46 pm

I've just realised the title of this thread is incorrect! It should be "SSTV-VGA Up-Converter MkI", with no mention of 625 or 525. It's mutated from a 625 output into 800x600 VGA. I'll start a new thread to clarify matters. I won't lock this tread for now, but maybe in a month I will.

The continuation thread will be "SSTV-VGA Up-Converter MkI".

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Re: SSTV-625 Up Converter MkV (Five)...

Postby Harry Dalek » Fri Apr 30, 2021 8:05 pm

Steve Anderson wrote:I've just realised the title of this thread is incorrect! It should be "SSTV-VGA Up-Converter MkI", with no mention of 625 or 525. It's mutated from a 625 output into 800x600 VGA. I'll start a new thread to clarify matters. I won't lock this tread for now, but maybe in a month I will.

The continuation thread will be "SSTV-VGA Up-Converter MkI".

Steve A.


On the discontinued video formats for Television as in plugging things into a monitor or more so for a television these days as we have all noticed we have never had more of choice of different formats than today to plug into a Tv .
But for computer monitors i think its going to go the other way fast where nothing is plugged in its all wireless .
Some future constructor might have to work out away around this if TVs go the way of computer monitors ...plug in cables seem to be on the way out and that's no fun ! OH well i will stay in my rut i like the past and keep it alive .
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: SSTV-625 Up Converter MkV (Five)...

Postby Steve Anderson » Sat May 01, 2021 11:51 am

Harry Dalek wrote: ...plug in cables seem to be on the way out and that's no fun ! OH well i will stay in my rut i like the past and keep it alive .

At the moment it's 'the thin end of the wedge', but it's inevitable I think. Multi-conductor cables and their connectors cost money, the components for a wireless link will become cheaper than cables in time.

But there's the security issue to address, how to stop your neighbour seeing what you are? Financial statements, or simply 'awkward' e-mails...we won't go there.

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Re: SSTV-625 Up Converter MkV (Five)...

Postby Steve Anderson » Thu May 06, 2021 5:08 pm

For a number of reasons I'm placing this project 'on-hold'. Most significantly a paid project that perfectly overlaps a NBTV project I started some time ago has landed in my lap. Expect to see a resumption of the DC-coupled NBTV PC recorder (or whatever I called it) very soon.

I will resume this thread when the above is complete...I am on a fixed timeline so it shouldn't be that long an interruption...

The original thread was called "Negating LF problems of NBTV.", which I will continue...in the 'Electronic NBTV' section...I started it just over a year ago, this SSTV-VGA thing has distracted me...

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