Multiple Distance Over 750m!

[daubs8]

The heading should have been 'multiple cameras over 750m! Need some advice on this. We are trying to get 3 cameras 750 metres down a conveyer. There is an 8 core unshielded non cat5 cable at the site and we can get a good picture using a balun and 2 or 4 of the cores. Our problem comes when we attach a 2nd camera, we get interference which is understandable. We also have available 4 75mm power cables which again we get a decent picture off until we add a 2nd camera. We can install cat5 but without buying it in a 1000m roll which is mega we would have to join it twice. Question is could we get 2 or more video signals down the cat5 without one interfering with the other? We can use any combination of the current cables to provide the other video signal and rs485 for the speedome? Money isn't really an objective but the use of coax is! Thanks.

[ilkie]

The heading should have been 'multiple cameras over 750m! Need some advice on this. We are trying to get 3 cameras 750 metres down a conveyer. There is an 8 core unshielded non cat5 cable at the site and we can get a good picture using a balun and 2 or 4 of the cores. Our problem comes when we attach a 2nd camera, we get interference which is understandable. We also have available 4 75mm power cables which again we get a decent picture off until we add a 2nd camera. We can install cat5 but without buying it in a 1000m roll which is mega we would have to join it twice. Question is could we get 2 or more video signals down the cat5 without one interfering with the other? We can use any combination of the current cables to provide the other video signal and rs485 for the speedome? Money isn't really an objective but the use of coax is! Thanks.

Running video and data 750m in an industrial enviroment, you should be considering fibre.

Ilkie

[Alpat Systems]

As Ilkie, fibre it for guaranteed results.

Its not as expensive as you may think.

We successfully ran a 900m External Grade unshielded CAT5e cable, as a temporary install in a quarry environment. This had 2 joints. We used

http://www.minitran.co.uk/pages/products/l...ufacturer=Mini5

...for the joints, which where contained within IP65 rated enclosures.

and active baluns (transmitter/reciever) at each end.

[daubs8]

Just to update. I ran 950m of external grade cat5 with active transmitters and receivers. The pictures are fine although on Adpro I am losing approx 60 degrees of picture out of 360 degrees on the speed dome. The picture on the analogue monitor is fine though. A boost on the data connection will sort this then all's well. Thanks for the replies.

[sjonley]

Here's 3 options:

1. Use fibre and fibre modules. This will stop any localised interference plus a single 4 core tight buffered offers two redundant cores. I would recommend a subcontractor to sort out the cabling and terminations since the termination kit comes to many hundreds of pounds and has to be done correctly.

2. Cable to the nearest external wall at both ends and then use a video transmitter/receivers to send the video signal.

3. If the company has an internal structured cable system employed running a local intranet, utilising multichannel encoder/decoders over an IP network may be a viable option.