HackTV nbtv-am mode + HackRF ONE - first tests
Автор: Peter Spies
Загружено: 2021-02-16
Просмотров: 2598
Описание:
HackTV software in nbtv-am 32-line video mode - first tests
SETUP
HackTV and Hacktv-gui software on Windows PC
HackRF One SDR transceiver
attenuator with DC-blocking capacitor
tunable xtal detector (am medium wave)
af amplifier (single transistor)
mechanical NBTV 32-line disc monitor
oscilloscope for visual monitoring of video signal
OBSERVATIONS
image is rotated by 90 degrees and mirrored
sync pulses very large in proportion to the video signal
It would appear that the implementation of the NBTV 32-line club standard in HackTV (committed Dec. 1, 2020) does not take the scanning direction and aspect ratio of the standard into account.
(NBTV has 32 vertical lines, 12.5 horizontal frames / sec and the scanning direction is from bottom right to top left of the frame. Aspect ratio is 3:2 in portrait orientation.)
LINKS
NBTV standard: www.nbtv.org (navigate to Handbook, chapter 25). Also contains definitions of the Baird and TeKaDe 30-line standards
HackTV: https://github.com/fsphil/hacktv
HackTV-gui: https://github.com/steeviebops/jhackt...
HackRF One: https://greatscottgadgets.com/hackrf/...
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