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Thread: Amplifying the VGA signal...

  1. #1
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    Post Amplifying the VGA signal...

    I have a 12' VGA cable that I will hopefully be using in the car, but when I went to test it (luckily before I installed it), I noticed that it makes the picture on the LCD very fuzzy. I also have the PS/2, USB, and Audio cables tie-wraped together to make a simple to install wiring harness. Therefore, I don't know if the picture I am seeing is related to any possible interference from the other cables (even though the monitor cable is shielded) or due to the increased resistance in the cable length and any related signal loss.

    If it is due to signal loss, is there a way I can amplify the signal between the Video out and LCD in?

    If it is due to interference, do you think that running these wires seperately will decrease any interference?

    Thanks,
    Jonathan
    JZ CarPC - 1998 Volvo C70
    Shuttle SV-24 Celery 400Mhz 128MB SDRAM 60GB HD DVD, 12.1" VGA TFT LCD, Sproggy/Mastero DC-DC ATX PSU, Mucha ATX shutdown controller, Co-Pilot GPS

  2. #2
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    Post

    is it easy to unbundle them to test? or better yet, just attach the VGA without attaching the other 2 cables and see if you still have the problem.

    my guess is however that you're getting reflection within the cables... was this a premium cable that you bought, or just some $20 cheapo one?

    You might want to check here, for example, however unfortunately those things tend to be expensive for what they are. also, what type of LCD are you hooking it up to, and how much cable do you really need?
    IN DEVELOPMENT -- '96 Mustang, lilliput with PII/450 laptop, custom DC-DC power supply, 60GB; Garmin GPS; 802.11g; compact keyboard, small graphical LCDs, OBDII.

  3. #3
    Retired Admin Aaron Cake's Avatar
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    Cool

    It sounds like the cable isn't very good. I've extended a VGA signal 150 feet without any noticeable loss in quality. But if I remember correctly, the cable cost somewhere around $120. It was just a standard cable, with no built in amp. But it was very high quality.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  4. #4
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    Post

    I tried hooking it up without any of the other devices plugged in with the same result - poor picture quality. I will try a different cable in the meantime.

    Can you recommend a place to pick up a good quality cable without necessarily spending an arm and a leg?
    Thanks,
    Jonathan
    JZ CarPC - 1998 Volvo C70
    Shuttle SV-24 Celery 400Mhz 128MB SDRAM 60GB HD DVD, 12.1" VGA TFT LCD, Sproggy/Mastero DC-DC ATX PSU, Mucha ATX shutdown controller, Co-Pilot GPS

  5. #5
    Retired Admin Aaron Cake's Avatar
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    Cool

    http://www.startech.com has a bunch of different cables. Be sure to go for the good ones, not the generic grey ones.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

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