03 April 2016, 15:57 | #1 |
Registered User
Join Date: Feb 2016
Location: SAO PAULO
Posts: 27
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Problem with Scandoubler: vertical bars
Hi guys.
I have an Scandex Scandoubler and its behaving oddly. I attached to 22" LCD Monitor and got vertical bars. So I decided to use it on my LG 1721a Flatron (15Hz capable monitor) and got these: Using the Scandoubler and selecting monitor's 15Hz mode: Using the Scandoubler and selecting monitor's VGA Mode: Composite mode: (obs: the bluish color is probably my mobile cam distortion) Using a RGB cable (15hz) - No scandoubler: The 15Hz image using the scandoubler should not be dark, at least the same as the same as the VGA mode. Do you guys can try to help me out please, where should I start checking it? I have good electronic skills and equipment. Best Regards |
03 April 2016, 19:00 | #2 |
Registered User
Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 6,348
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First off, make sure the grounding is ok everywhere that it should be - cable and scandoubler.
Have a look at the power supply to the scandoubler on an oscilloscope. It's possible there's some sort of interference from something else nearby that's causing the repeating patterns. It would most likely be a video clock as the lines are synchronised with the horizontal clock. To confirm if a clock is causing the interference, put one of the RGB outputs (I would say red would be the best bet as it is showing the most interference in those photos) on the second channel of the scope and look for similarities between the two signals. |
03 April 2016, 19:04 | #3 |
ex. demoscener "Bigmama"
Join Date: Jun 2012
Location: Fyn / Denmark
Posts: 1,624
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Interference, bad connection, or a bad passive component (likely a capacitor), I'd say.
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03 April 2016, 20:26 | #4 | |
Registered User
Join Date: Feb 2016
Location: SAO PAULO
Posts: 27
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Quote:
While I was testing I managed to get better images manually configuring my monitor and changing its clock adjustment. Take a look: (The bluish images are my mobile cam distortion) I also noticed it got a little cleaner when I connected this device, a CVBS converter. It drops the signal a bit: But will hook to an osciloscope and see the clock. |
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04 April 2016, 14:30 | #5 |
mä vaan
Join Date: Nov 2001
Location: Finland
Posts: 1,655
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I have excatly same problem.
However my problem is both of my scandoublers. I haven't tested with my other A1200 Computers. But I quest that tells that problem is with Amiga, not a scandoubler. http://amiga.resource.cx/exp/scanmagicint http://amiga.resource.cx/exp/scandy1200 Last edited by utri007; 03 March 2021 at 22:10. |
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