SSTV NBTV ?

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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SSTV NBTV ?

Postby Harry Dalek » Sun Sep 30, 2018 12:19 am

I came across this a posting from chris long on facebook a tv system bit like slow scan tv and a bit like NBTV \
For those without face book heres what i found
https://www.facebook.com/groups/1522320 ... 778730135/
https://www.facebook.com/search/str/ZL2 ... ded_videos
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ANOTHER TEST of high-speed SSTV using ZL2AFP software, in the lead up to tests of MOVING picture narrow-bandwidth TV. Vic Brown G3SDQ transmitted 72-line images of his London (UK) shack briefly on 3712.5kHz (80 metres), which I received and recorded via the Hack Green online web-SDR, about 200km to the North-West of Vic in Cheshire. He transmitted one picture every three seconds. I decoded the pictures from the Hack Green audio stream, here at VK3AML in Melbourne, Australia. Each Saturday morning between 07:30 and 08:00 UTC, the narrow band TV net in UK experiments with new methods of NBTV on 3712.5kHz plus or minus QRM. Please, if you're within range in Europe, do join us!
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Chris Long Last week, we tried the 48-line version of the ZL2AFP software, transmitting one picture per second:


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In the WATERFALL DISPLAY of the audio stream produced by the ZL2AFP software, you can see the 96 subcarriers, one per picture scan line, each modulated by very narrow bandwidth FM - in fact if you look hard you can almost see a negative image of me in the waterfall. This is an entirely analog process, though it uses multiple subcarriers similar to OFDM technique:WATERFALL DISPLAY of the narrow band video signal used for this test. Each of the 72 lines of the image are simultaneously scanned, and each line is allocated a separate NBTV audio tone, spaced about 30 Hz apart, frequency modulated by the greyscale values, and occupying a band of frequencies from about 300 Hz to 2600 Hz:
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As below he says you will not find the software on the net well that was 2016 ? fft-tv.zip any case very interesting may be its there now ....i found one link to download the file but it was dead link sadly.



Chris Long By the way, the software that was used for those tests was not on the page for which you gave the url. It is a development from it, also by Con Wassilieff ZL2AFP, and as far as I know it's unpublished, but I can give you the zip files if you message me.
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NBTV14673047_1794848200791138_126984208504586240_n.mp4
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nnbbttvv14673047_1794848200791138_126984208504586240_n.mp4
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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: SSTV NBTV ?

Postby Monochrome » Mon Oct 15, 2018 1:53 am

Hi Harry,

Trawling through the posts in an effort to catch-up on NBTV activity I stumbled upon your posting "SSTV NBTV" and was very interested in the item about fft-tv.zip

I have experimented with Con's software in the past so I was delighted to learn of the existance of fft-tv.zip though sadly a quick search on the Internet revealed only a couple of dead links for that package.

Would it be possible for you to e-mail me a copy of the zip as I would like to give that one a try?

Regards,

Des (aka Monochrome & M0AYF)
Monochrome
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Re: SSTV NBTV ?

Postby Harry Dalek » Mon Oct 15, 2018 2:47 pm

Monochrome wrote:Hi Harry,

Trawling through the posts in an effort to catch-up on NBTV activity I stumbled upon your posting "SSTV NBTV" and was very interested in the item about fft-tv.zip

I have experimented with Con's software in the past so I was delighted to learn of the existance of fft-tv.zip though sadly a quick search on the Internet revealed only a couple of dead links for that package.

Would it be possible for you to e-mail me a copy of the zip as I would like to give that one a try?

Regards,

Des (aka Monochrome & M0AYF)


Hi Des i went looking for it as well and came up with the same dead link :roll:
i think chris long mentioned in these postings on face book if you contacted him and he will pass on a copy might be best to contact him on Facebook messager.
I should mention FreeNBTV i think can do something similar you can drop the frame rate or increase it in the program very handy to make a video file or live video for a custom tv format ...so i am pretty sure it could copy the software chris long was using above as far as the line and frame rates ...but in NBTV system not a speeded up SSTV FM
viewtopic.php?f=8&t=2458&p=23241&hilit=freenbtv#p23241
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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Posts: 3836
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Re: SSTV NBTV ?

Postby Monochrome » Tue Oct 16, 2018 5:58 am

Hi Harry,

Thanks for responding and for the pointers to Chris Long. Sadly I dont have a Facebook account but I may be able to find a work around ;-)

Re Free NBTV, I did try that one but have (so far) not been able to get it working on my laptop. When time permits I will give it another go on my old desk-top machine. It really is an impressive looking software tool for nbtv work.

Thanks again for taking the time to respond.

73,s

Des (aka Monochrome & M0AYF)
Monochrome
"Fester, enough of the light-bulbs!"
 
Posts: 13
Joined: Sat Jun 02, 2007 7:19 am

Re: SSTV NBTV ?

Postby Harry Dalek » Tue Oct 16, 2018 3:45 pm

Monochrome wrote:Hi Harry,

Thanks for responding and for the pointers to Chris Long. Sadly I dont have a Facebook account but I may be able to find a work around ;-)

Re Free NBTV, I did try that one but have (so far) not been able to get it working on my laptop. When time permits I will give it another go on my old desk-top machine. It really is an impressive looking software tool for nbtv work.

Thanks again for taking the time to respond.

73,s

Des (aka Monochrome & M0AYF)


Des use the last version of Free NBTV on page 3 ,the version on page 1 you needed extra drivers version 2 and 3 don't have this problem ....if you have problems working it out my postings on that topic pages and helped me work it out but i can help if you want its easy like every thing once you know so just ask here i will keep an eye out .
The sstv software i will see if i can track it down as well ,i wouldn't mind it it does look interesting .
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.
User avatar
Harry Dalek
"Fester! Don't do that to 'Thing'"
 
Posts: 3836
Joined: Fri Sep 26, 2008 4:58 pm
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