The last link is interesting. (no audio), any further information?
Steve A.
Narrow-Bandwidth Television Association
Forum for discussion of television and imaging using mechanical, radio, and early electronic systems.
NBTV Software
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Re: NBTV Software
by Steve Anderson » Mon Jul 03, 2023 5:36 pm
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Steve Anderson - "Fester! Don't do that to 'Thing'"
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Re: NBTV Software
by Harry Dalek » Sat Jul 08, 2023 7:59 pm
Steve Anderson wrote:The last link is interesting. (no audio), any further information?
Steve A.
More here Steve as i recall he explains the system in one of the earlier videos you might understand how he has done this
https://www.youtube.com/@kargaroc386/se ... %20line%20
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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Re: NBTV Software
by GrantXTV » Thu Sep 26, 2024 5:29 am
Hi All,
I have setup a Get-hub account, both the NBTV_TX and the NBTV_RX files are there for version 2.9. Here is the Link: https://github.com/GrantXTV/NBTV-Project
There are bugs in the software, let me know if there is any issues getting the files and installing them?
In the last few day I have experimented with different ideas for the configurations for the modulator and the demodulator, I tested out the new design with sending to file and receiving back from file. As I still running my CPU full out at 100%, giving me a frame rate of about two video frames per second. Once I get some feedback from the encoder / decoder software that up on on GitHub, I will make the GNU Radio files available to limited number users to tryout. As it is not that easy do a full testing with my current hardware, until I can get a newer computer to work with.
Here are a few images showing the upper level of the GNU Radio modulator and the demodulator, with the other one showing testcard F, of the video coming back to the decoder. I was testing with mode 4 the uncompressed video mode at 120 x 96 x 8, 1/3, as I get a number of errors with modes 1 to 3, which is still been worked on. This new type of NBTV system designed for HF radio sky wave propagation, still very much a work in progress. Software was tested with Ubuntu Linux, using Gambas3 modules as the base layer, that will need to be install as well as the NBTV application.
Grant
I have setup a Get-hub account, both the NBTV_TX and the NBTV_RX files are there for version 2.9. Here is the Link: https://github.com/GrantXTV/NBTV-Project
There are bugs in the software, let me know if there is any issues getting the files and installing them?
In the last few day I have experimented with different ideas for the configurations for the modulator and the demodulator, I tested out the new design with sending to file and receiving back from file. As I still running my CPU full out at 100%, giving me a frame rate of about two video frames per second. Once I get some feedback from the encoder / decoder software that up on on GitHub, I will make the GNU Radio files available to limited number users to tryout. As it is not that easy do a full testing with my current hardware, until I can get a newer computer to work with.
Here are a few images showing the upper level of the GNU Radio modulator and the demodulator, with the other one showing testcard F, of the video coming back to the decoder. I was testing with mode 4 the uncompressed video mode at 120 x 96 x 8, 1/3, as I get a number of errors with modes 1 to 3, which is still been worked on. This new type of NBTV system designed for HF radio sky wave propagation, still very much a work in progress. Software was tested with Ubuntu Linux, using Gambas3 modules as the base layer, that will need to be install as well as the NBTV application.
Grant
- Attachments
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Demod_192_RX.pdf- Shows the GNU Radio NBTV demodulator
- (26.76 KiB) Downloaded 30 times
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- Mod_192_TX.pdf
- Shows the GNU Radio NBTV Modulator
- (29.43 KiB) Downloaded 29 times
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- Images show testing the modulator and demodulator, sending to and from a file
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- NBTV OFDM Performance vs VSB AM and FM modulation
- Carrier to Noise.png (54.2 KiB) Viewed 1626 times
- GrantXTV
- "Fester, enough of the light-bulbs!"
- Posts: 18
- Joined: Wed Jul 20, 2022 9:44 am
18 posts
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