On Thu, 24 Aug 2000 16:06:05 +0200, you wrote:

>At 20:05 23.08.2000 -0400, you wrote:
>>I would probably use one of the cheap CCD modules and send the =
composite
>>signal up a coax.  You can get some nice cable that has CAT5 and RG6 in=
 the
>>same jacket.
>
>I thought about this as well, but I keep running into some problems. =
Some
>of these are probably just showing that I don't really know much about
>video, and video transmissions :-(
>
>First of all, the cameras I have seen are fairly expensive.
Look at the cheap  PCB-type camera modules, not the big boxes with
lenses screwed on the front. =20
Mono PCB cameras start around UKP30-40 (US$50-65), and can be as small
as 15x15x20mm including lens. Colour ones are only slightly more.=20

>Secondly, how far can these signals travel without unacceptable signal
>degredation? I need
>about 110-120 meters ( I want the sub to be able to operate down to 40 =
m,
>with a range of about 100m from the boat)
100M should be quite feasable with a proper 75 ohm driver and
correctly terminated good quality cable. Somewhere in the Maxim
databook I saw an apnote on sending video down a twisted-pair - can't
remember the length though. Another possibility could be to use a UHF
modulator  - might be easier to combine power and baseband signalling
onto UHF than raw composite - you may need lower capacitance cable
though. =20
UHF would also allow the use of multiple cameras on one cable.
=20

>Thirdly, using a camara such as this means I have to have a seperate
>monitor for the videoimage (or use some kind of "tv" capture card for a
>pc). But what I really want is to have the image on the computer screen
>together with the controls.
TV capture cards and video-to-USB devices are not exactly expensive...
>Btw. does anyone know how many frames pr. second you manage to get
out of
>the combination of a CoolCam/VV6xxx and one of the pic controllers?
Analogue video would give you 50/60fps...

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