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Diagonal lines on video
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vinnielo



Joined: 19 Feb 2008
Posts: 13
Location: hertbeat Country

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PostPosted: Tue Feb 19, 2008 2:34 pm    Post subject: Diagonal lines on video Reply with quote

Hi, all,

I've just bought a McCam birdbox from eBay and have found diagonal lines on my video ever since installing it in my garden.
I'm not aware of any interference issues around the garden but I have read on the net that there may be a problem with "ground loops".

Has anyone else had experience of ground loops and how have you managed to eliminate the problem?

Thanks in advance.
Diagonal pattern
Diagonal pattern
Poster: vinnielo, viewed 73 Time(s)
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Martin



Joined: 03 Nov 2005
Posts: 843
Location: Stevenage, Herts

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PostPosted: Tue Feb 19, 2008 4:22 pm    Post subject: Reply with quote

do you have lighting in your box ? if so do the lines show up when the lights are on ?
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Martin
http://the2wrennies.co.uk/
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vinnielo



Joined: 19 Feb 2008
Posts: 13
Location: hertbeat Country

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PostPosted: Tue Feb 19, 2008 4:32 pm    Post subject: Reply with quote

The lighting, I've been told, only works in good sunlight, so I can't tell yet.
There's a sensor on the outside of the box that detects the amount of "white light" in the surroundings and adjusts the LEDs inside the box accordingly. Apparantly, the sun's still pretty low in teh sky, so I'm unlikely to get any decent light/colour just yet.
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Martin



Joined: 03 Nov 2005
Posts: 843
Location: Stevenage, Herts

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PostPosted: Wed Feb 20, 2008 7:50 am    Post subject: Reply with quote

vinnielo wrote:

There's a sensor on the outside of the box that detects the amount of "white light" in the surroundings and adjusts the LEDs inside the box accordingly.

I must stop giving my ideas away !

perhaps if you shine a torch on the sensor and take another picture and see if the lines are still there ?

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http://the2wrennies.co.uk/
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fsphil



Joined: 09 Mar 2006
Posts: 1549
Location: Cookstown, N.Ireland

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PostPosted: Wed Feb 20, 2008 7:57 am    Post subject: Reply with quote

Don't you just hate it when people copy your ideas...

*covers up incomplete light sensor circuit...*

Whistle

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-Phil
https://webcam.sanslogic.co.uk/
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Martin



Joined: 03 Nov 2005
Posts: 843
Location: Stevenage, Herts

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PostPosted: Wed Feb 20, 2008 8:03 am    Post subject: Reply with quote

darn it !

right, that's it....my new mk2 light sensor system is staying a secret !

Wink

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Martin
http://the2wrennies.co.uk/
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vinnielo



Joined: 19 Feb 2008
Posts: 13
Location: hertbeat Country

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PostPosted: Wed Feb 20, 2008 12:55 pm    Post subject: Reply with quote

Martin wrote:

I must stop giving my ideas away !

perhaps if you shine a torch on the sensor and take another picture and see if the lines are still there ?

Well, before I asked for assistance, this is what I tried doing. But after speaking with the manufacturer, they said torches don't give "white light", so the only way for it to work is with sunlight.
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vinnielo



Joined: 19 Feb 2008
Posts: 13
Location: hertbeat Country

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PostPosted: Wed Feb 20, 2008 2:05 pm    Post subject: Reply with quote

Hmm, I've done more investigation and it seems it may (or may not) have something to do with my satellite cable that runs in parallel with my video cable a lot of the way.
I've found that when I have the satellite cable wired up to my decoder, the interference is less obvious.
When it's disconnected, the interference is worse.
I'm thinking there may be two kinds of interference here cancelling each other out that gives a less obvious picture, (cos removing something can't make things worse!!).

It's irrelevant whether my satellite decoder is switched on or not (at the mains).

Attached it the image of when the cable is disconnected.
Satellite cable disconnected
Satellite cable disconnected
Poster: vinnielo, viewed 74 Time(s)
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fsphil



Joined: 09 Mar 2006
Posts: 1549
Location: Cookstown, N.Ireland

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PostPosted: Wed Feb 20, 2008 5:56 pm    Post subject: Reply with quote

Are you disconnecting it at the LNB or the decoder?
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vinnielo



Joined: 19 Feb 2008
Posts: 13
Location: hertbeat Country

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PostPosted: Wed Feb 20, 2008 6:08 pm    Post subject: Reply with quote

I've tried unplugging at both the DiSEqC output end and the decoder end. Both produce the same results (as well as unplugging at both ends at the same time).
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fsphil



Joined: 09 Mar 2006
Posts: 1549
Location: Cookstown, N.Ireland

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PostPosted: Wed Feb 20, 2008 11:18 pm    Post subject: Reply with quote

Strange one.

What equipment is there between the camera and the computer? Have you tried plugging the video directly into a TV?

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vinnielo



Joined: 19 Feb 2008
Posts: 13
Location: hertbeat Country

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PostPosted: Wed Feb 20, 2008 11:23 pm    Post subject: Reply with quote

Between the camera and the computer?
I use an A.C. power lead that provides the power, mono audio and composite video. One end is connected to the camera/microphone. The other end of the lead comes up to a RCA (phono) switch box. The video output of the switch goes to my TV card. The audio goes to my hi-fi. I've tried bypassing the switch box and also using a phono->SCART adaptor to feed my VCR before using RF to transmit to my TV card. All the same.

As well as the lines on the video, I also get a faint 50Hz buzz on the audio.

I've tried plugging into my TV downstairs. There was major hatching patterns, similar to my second attachment, which leads me to think that perhaps the satellite lead is, indeed, cancelling out the interference to an extent.
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fsphil



Joined: 09 Mar 2006
Posts: 1549
Location: Cookstown, N.Ireland

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PostPosted: Wed Feb 20, 2008 11:40 pm    Post subject: Reply with quote

Your using an AC power lead to carry the video?

Are you always using the antenna (RF) input on your capture card? Just that the pattern in your second image looks like RF interference of some kind.

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https://webcam.sanslogic.co.uk/
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vinnielo



Joined: 19 Feb 2008
Posts: 13
Location: hertbeat Country

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PostPosted: Wed Feb 20, 2008 11:45 pm    Post subject: Reply with quote

No, what I *really* meant, of course, is an AV power lead! Wink
http://www.maplin.co.uk/module.aspx?C=SO&U=strat310&T=Camden&ModuleNo=98415&ma=Camden+-+AV+Power+Extension+Cable

I mostly use it with the composite video input on my TV card.
Ditto with the TV downstairs.
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fsphil



Joined: 09 Mar 2006
Posts: 1549
Location: Cookstown, N.Ireland

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PostPosted: Thu Feb 21, 2008 12:01 am    Post subject: Reply with quote

Phew, had me worried there for a second Wink

Faulty cable maybe? Try it between a known working device (another camera or DVD player) and your computer.

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https://webcam.sanslogic.co.uk/
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