If you really need full-motion 30 (or so) fps video, than some digital=20
solution is probably the way to go.  Although, considering ethernet over=20
twisted pair actually works, I wonder if modulating the video at a=20
relatively low frequency, say 3-5 MHz, wouldn't help it survive the trip.

If you don't really need full motion, then some slow scan technique shoul=
d=20
be a piece of cake over a km.

There are relatively low cost RF solutions that will work over a km.=20
Depends on laws, though. Might not be a choice in all jurisdictions.

--McD


----- Original Message -----=20
From: "liam ." <liaaam2@gmail.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Friday, October 21, 2005 6:18 AM
Subject: [EE] Video over long distance


> List,
> I've got a relative who needs to get video (color PAL) over akilometer=20
> however only on a single twisted pair. I know this isprobably beyond my=
=20
> electronics ability so an off the shelf styleapproach is probably neede=
d.
> He has been talking to an "expert" who has suggested a solution I amhav=
ing=20
> trouble with=85. They have been told to: Use a small PC to acceptup to =
4=20
> video signals and act as a streaming web server to stream outof a 10mbp=
s=20
> Ethernet. Then use a dongle which will convert Ethernet to12mbps over a=
=20
> single twisted pair and back.
> Considering they want to record this to DVD for later viewing I can'tse=
e=20
> this will work too well. All of the camera to Ethernet I have seenopera=
te=20
> like web cams sending jpegs to a web browser. To convert thisto a DVD w=
ill=20
> take a fair bit of processing on the behalf of a laptop.
> The video is for remote diagnostics and so production quality is=20
> notnecessary. Also they are locked into some twisted pair they=20
> alreadyhave.
> Anyone got ideas ??
> Liaaam
> --=20
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>=20

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist