Camera feed = lines through projector screen

[Steve G.]

Hey Guys,

I have a problem with lines or shall I say "fat blurry" lines going through our projector screen - this is not the main projector in the sanctuary, it is a smaller one in a different building - at the moment it is intended to get a live feed from the sanctuary.
Let me explain the signal chain - Camera>RS Distribution Amplifier>RF Modulator>RF Coax signal (outdoor 120 ft)>(back inside)TV(the image is perfect on the tv)>line out from TV to projector="fat blurry lines".

What do you think the problem can be?
I have a perfect video signal until the projector, then I have these ugly lines.

Thanks in advance

Steve

[jsharris83]

can you bring another TV in there and plug it in to the direct out that was going to the projector. If the lin is still there then something could be wrong with the direct output on the TV. I dont think that it is the cable going to the Projector but could be possible. If you can test the projector in another video feed that you know is good for instance instead of going to the TV first go to the Projector and see if it still has the lines. If it does then we know that it is the projector. Then i would proceed if it is the projecotor to checking the lens and the bulb in the projector see if it is dirty. Good Luck and hope this helps you somehow!

[AlexH237]

Is it possible it could be the line out from the TV? Try a different TV, or splitting the video signal, have one go to the TV and the other to the projector to make sure the TV out isn't messing it up. I am assuming you swapped out the cable from TV to projector, but if you haven't try that.

EDIT:jsharris beat me to it.

[jsharris83]

Sorry Alex LOL.

[Steve G.]

Originally Posted by AlexH237

Is it possible it could be the line out from the TV? Try a different TV, or splitting the video signal, have one go to the TV and the other to the projector to make sure the TV out isn't messing it up. I am assuming you swapped out the cable from TV to projector, but if you haven't try that.

EDIT:jsharris beat me to it.

Yep I had already swapped out the cable and I know the projector is fine cuz' we use it all the time and it never has lines.
The thing is I can't just split the line cuz' it's an RF feed and I need it to go through the TV so I can have sound and so I can convert the RF to a video feed.
I think I'll try putting another TV in there and see what happens.

Keep the ideas comin'

Steve

BTW, thanks for the help so far

[AlexH237]

Originally Posted by jsharris83

Sorry Alex LOL.

Great minds think alike .

Originally Posted by Steve G.

Yep I had already swapped out the cable and I know the projector is fine cuz' we use it all the time and it never has lines.
The thing is I can't just split the line cuz' it's an RF feed and I need it to go through the TV so I can have sound and so I can convert the RF to a video feed.
I think I'll try putting another TV in there and see what happens.

Ya, it sounds like the TV's output is messing up the signal.

[nevmoor]

Try using VCR to demodulate the signal also. If it turns out that it is the out on the TV you could either use the VCR as the projector feed or get a demod for it.

[kbob]

and or another RS distribution amp...

cheap, in the category of Kbob's "It just works".

[garringt]

We had a similiar problem when we opened a video venue. The two buildings were on seperate grounding (electrical) systems, and this created rolling bars in the picture. (A video signal being created by one electrical system, being displayed by another electrical system).

We're sending the signals over CAT5 (one for the video and one for the audio). I'd suggest getting rid of the RF cable...long runs are very likely to pick up interference and have signal loss. Also you can transmit S-video signals over CAT5, if your camera will allow.

Then look at adding a video hum eliminator from B&H Photo.

[Steve G.]

Originally Posted by garringt

We had a similiar problem when we opened a video venue. The two buildings were on seperate grounding (electrical) systems, and this created rolling bars in the picture. (A video signal being created by one electrical system, being displayed by another electrical system).

We're sending the signals over CAT5 (one for the video and one for the audio). I'd suggest getting rid of the RF cable...long runs are very likely to pick up interference and have signal loss. Also you can transmit S-video signals over CAT5, if your camera will allow.

Then look at adding a video hum eliminator from B&H Photo.

Actually the RF signal is perfect, it was a nice signal going to the other building - it's when I take the line even further and hook it up to a projector that I get the problem.

Can you post a link of that video hum eliminator you were talking about?

Steve