looking for a wireless system

hi
I am looking for a wireless system for the following set up:

we have an under water camera with cable, we can get the cable to
the surface (where we have a battery with solar recharging).  There
we just need a wireless system to get the signal to a computer that
is connected to a network (about 100 yards = approx 91 meters ).

I was thinking of the using same wireless systems used in computers for 
wireless LAN. But that might need some sort of a computer on the 
transmitter side (?)

Maybe a simpler (and cheaper) solution is out there. where the camera 
connects to a device, that simply sends the video (pictures) wirelessly 
to the receiver.

thanks

> hi
> I am looking for a wireless system for the following set up:
>
> we have an under water camera with cable, we can get the cable to
> the surface (where we have a battery with solar recharging).  There
> we just need a wireless system to get the signal to a computer that
> is connected to a network (about 100 yards = approx 91 meters ).
>
> I was thinking of the using same wireless systems used in computers for
> wireless LAN. But that might need some sort of a computer on the
> transmitter side (?)
>
> Maybe a simpler (and cheaper) solution is out there. where the camera
> connects to a device, that simply sends the video (pictures) wirelessly
> to the receiver.
>
> thanks

Check here http://www.supercircuits.com/store/home.asp


-Bruce
http://www.rentron.com

On Tuesday, in article <cftv1s$g3l$1@gist.usc.edu>
     hsuri@usc.edu "suri" wrote:
>hi
>I am looking for a wireless system for the following set up:
>
>we have an under water camera with cable, we can get the cable to
>the surface (where we have a battery with solar recharging).  There
>we just need a wireless system to get the signal to a computer that
>is connected to a network (about 100 yards = approx 91 meters ).

The question that comes to mind first is where is this going to be situated?

        International Waters?
        A Particular country?
        Within a built up area?
        Park/lake area?
        Wilderness area?
        What type of video signal (analog, component, digital..)?
        Do you need every frame, every second frame, one frame a second etc..

All of these points have a bearing on what is possible.

>I was thinking of the using same wireless systems used in computers for
>wireless LAN. But that might need some sort of a computer on the 
>transmitter side (?)

Yes it will to deal with

        finding other points on the wireless network to talk to
        handling the network traffic, dropouts, interference etc..
        grabbing images
        compressing the images (lots and lots of data),
        breaking the compressed image up into packets,
        sending the packets
        waiting for acknowledgemnets etc...

In a built up area you may have all sorts of other networks vying for the
bandwidth and the non-deterministic delays of wireless LANs may well mean
you end up missing frames. This will happen because at some point the retries
will back up the compression queue, so grabbed frames, will have nowhere to
go so you will have to start dropping frames.

>Maybe a simpler (and cheaper) solution is out there. where the camera 
>connects to a device, that simply sends the video (pictures) wirelessly 
>to the receiver.

Why not check if you can use a simple low cost and potential low power
analog system, there exists in most countries the band allowed for remote
video telemetry, or domestic video transmitters. These are cheap and can
be used without special radio licensing. If on open seas or lake, or
lake in wilderness area the likelihood of interference is minimal. These
are meant to be used for that type of range.

Leave getting it into computers to the land based end; where more electrical
and computing power is readily available.

-- 
Paul Carpenter		| paul@pcserv.demon.co.uk
<http://www.pcserv.demon.co.uk/>        Main Site
<http://www.gnuh8.org.uk/>              GNU H8 & mailing list info.
<http://www.badweb.org.uk/>             For those web sites you hate.

> we have an under water camera with cable, we can get the cable to
> the surface (where we have a battery with solar recharging).  There
> we just need a wireless system to get the signal to a computer that
> is connected to a network (about 100 yards = approx 91 meters ).

If this is a standard NTSC or PAL signal, you can use an off-the-shelf
video sender unit. These are commonly used for example in
radio-controlled aircraft.

> we have an under water camera with cable, we can get the cable to
> the surface (where we have a battery with solar recharging).  There
> we just need a wireless system to get the signal to a computer that
> is connected to a network (about 100 yards = approx 91 meters ).

If this is a standard NTSC or PAL signal, you can use an off-the-shelf
video sender unit. These are commonly used for example in
radio-controlled aircraft.