New fast dsstv mode for amateur satellites.
Hello everyone,
This is my first time posting here, so please do reprehend me in case I break a few guidelines.
For the last few months, I have been developing a new digital slow scan television mode for amateur satellites. The focus is to still be able to recover a complete image at reasonable speeds. In fact, current tests show that if 100% data recovery is desired, then up to 30% data loss can happen. If resolution is sacrificed, there can be up to 80% loss and still be able to recover the entire image, unlike sstv and other scanline systems. Also, a noise free image (100% recovery) can be received down to about 10dB SNR.
Would some of you be interested in this mode? It’s halfway thru development, and if there is enough interest I will post code on GitHub and this bulletin once it’s finished.
Thank you,
Sasha T
Sasha, Sounds interesting. Do you have any videos on the operation either at youtube or somewhere else? Dave, AA4KN
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On Wed, Sep 7, 2022 at 1:32 PM, Sasha Timsasha.nyc09@gmail.com wrote: Hello everyone, This is my first time posting here, so please do reprehend me in case I break a few guidelines. For the last few months, I have been developing a new digital slow scan television mode for amateur satellites. The focus is to still be able to recover a complete image at reasonable speeds. In fact, current tests show that if 100% data recovery is desired, then up to 30% data loss can happen. If resolution is sacrificed, there can be up to 80% loss and still be able to recover the entire image, unlike sstv and other scanline systems. Also, a noise free image (100% recovery) can be received down to about 10dB SNR. Would some of you be interested in this mode? It’s halfway thru development, and if there is enough interest I will post code on GitHub and this bulletin once it’s finished. Thank you, Sasha T
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I am very interested in the digital photo transmit mode. So far I have tested ordinary SSTV in many modes and DSSTV with reed-salomon correction. I constructed a Digital SSTV transmitter based on rpi suspended under a stratospheric balloon, which took pictures in the stratosphere from a height of 37 km and transmitted them to Earth at a resolution as high as 1920x1080 - it took about 4.5 minutes. 640x480 could be transmitted in 30sec to 1 min depending on the mode selected. As part of our tests last year, we tested sending DSSTV via the ISS repeater with success. I am very curious about your transmission method.
regards Tomek SP5LOT
śr., 7 wrz 2022 o 19:34 Sasha Tim sasha.nyc09@gmail.com napisał(a):
Hello everyone,
This is my first time posting here, so please do reprehend me in case I break a few guidelines.
For the last few months, I have been developing a new digital slow scan television mode for amateur satellites. The focus is to still be able to recover a complete image at reasonable speeds. In fact, current tests show that if 100% data recovery is desired, then up to 30% data loss can happen. If resolution is sacrificed, there can be up to 80% loss and still be able to recover the entire image, unlike sstv and other scanline systems. Also, a noise free image (100% recovery) can be received down to about 10dB SNR.
Would some of you be interested in this mode? It’s halfway thru development, and if there is enough interest I will post code on GitHub and this bulletin once it’s finished.
Thank you,
Sasha T
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Tomasz forgot metion also about EME digital SSTV tests last years (with more or less succcess) on the 100th anniversary of Lem.
So the topic is interesting.
73, Armand SP3QFE
W dniu 2022-09-09 01:54, Tomasz Blazej napisał(a):
I am very interested in the digital photo transmit mode. So far I have tested ordinary SSTV in many modes and DSSTV with reed-salomon correction. I constructed a Digital SSTV transmitter based on rpi suspended under a stratospheric balloon, which took pictures in the stratosphere from a height of 37 km and transmitted them to Earth at a resolution as high as 1920x1080 - it took about 4.5 minutes. 640x480 could be transmitted in 30sec to 1 min depending on the mode selected. As part of our tests last year, we tested sending DSSTV via the ISS repeater with success. I am very curious about your transmission method.
regards Tomek SP5LOT
śr., 7 wrz 2022 o 19:34 Sasha Tim sasha.nyc09@gmail.com napisał(a):
Hello everyone,
This is my first time posting here, so please do reprehend me in case I break a few guidelines.
For the last few months, I have been developing a new digital slow scan television mode for amateur satellites. The focus is to still be able to recover a complete image at reasonable speeds. In fact, current tests show that if 100% data recovery is desired, then up to 30% data loss can happen. If resolution is sacrificed, there can be up to 80% loss and still be able to recover the entire image, unlike sstv and other scanline systems. Also, a noise free image (100% recovery) can be received down to about 10dB SNR.
Would some of you be interested in this mode? It’s halfway thru development, and if there is enough interest I will post code on GitHub and this bulletin once it’s finished.
Thank you,
Sasha T
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participants (4)
-
Armand SP3QFE -
David Jordan -
Sasha Tim -
Tomasz Blazej