Andy;

  At my previous company we worked on/patented a  pacemaker transponder
system that had to transmit through body tissue at 900 mhz. You lose
30db in a couple of inches (Body is mostly water). Bills idea is
probably the sanest thing you would try (unless you have tons of money).
Other wise start going down in frequency (like real subs do) and give up
on high bandwidth. On the note of bobbers, if you did  use a bobber with
an 1.3 Ghz antenna.......>

Rob

Andy,

You might consider using a fiber-optic cable (the cheaper grade should
work o.k.). Off the shelf video transmitters/receivers (over fiber) can
be purchased for $200.00 to $300.00 ea.  Hey... Maybe you could put a
bobber and a hook on the line and reel in the big ones - a remote
control fishing pole!

Bill Rhoads

wrhoads@earthlink.net


----------------------------------

Andy Shaw wrote:

> Hi Folks,
> I'm sure one of you out there will know the answer to this one.
>
> Anyone any idea how well a 1.3GHz radio transmission will penetrate
fresh water. I build model subs and I know that standard 40MHz Radio
control gear  works well down to ten feet or so. I'm thinking of
mounting a black and white TV camera on a sub. I've seen a transmission
system that uses the 1.3GHz telemetry bands to carry a video feed, but
I'm not sure how well it will work.
>
> So any help would be much appreciated - Oh and it is not that off >
topic the  Sub has two PICs in it, one for depth/attitude control the
other for speed  control!
>
> Andy



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