Re: [PSUBS-MAILIST] radio link

["Al Secor" <wreckdiver@frontiernet.net>]

Sorry, got two of my links wrong....faulty memory ;-)

www.oceantechnologysystems.com is the correct adr for OTS and

www.divelink.net is correct for the second.

Two additional ones:

www.orcatron.com

http://www.fuji-us.co.jp/e/underwater/

Hope this is helpful to someone.

Andy, I realize that transducers (or anything else for that matter) is 
cheaper in quantity but I'm sure as hell aren't going to commit to any 
quantity when no one appears interested enough to give me any input.  My 
reasons for 32 Khz was to be compatible with my OTS scuba comm which is 
32.768 Khz USB but maybe there isn't that much interest in talking to 
divers....kind of hard to tell with no input.  I did find some cheap 40 Khz 
unpotted elements on E-Bay which are certainly a possibility.  Do you have 
any detailed info on what's involved to pot them?

Regarding your comment on pingers creating noise...I agree...I was not 
intending to run comm and pinger at the same time....Te pinger function I am 
going to include in the radio design is more of just an automated CW (morse 
code) broadcasted by the radio so it's signal could be zeroed in on without 
having someone constantly talking on the radio.

Al Secor

----- Original Message ----- 
From: "Al Secor" <wreckdiver@frontiernet.net>
To: <personal_submersibles@psubs.org>; "Rick and Marcia" 
<empiricus@telus.net>
Sent: Thursday, April 10, 2008 1:24 PM
Subject: Re: [PSUBS-MAILIST] radio link



If you want something that is tried and true and not half assed then
you need to go ultrasonic as Jay mentioned earlier.  The following
companies offer off the shelf solutions for underwater to surface comms:

www.ots.com

www.divelink.com

www.oceanreefgroup.com

There are a few others but these guys are the major players with OTS
probably being the top dog (I speaking strictly non commercial, non
military).

Ir you want reliable (mostly) and non-Mickey-mouse comm, this is the
way to go.  It's going to be somewhat pricey but hey, if we can afford
side scan sonar and all other types of expensive "toys" then a
reliable form of surface communication should be affordable.

Now, on a side note, I am working on a cheaper alternative using the
same basic design as the companies listed above.  My major stumbling
block is an affordable transducer which I am still looking for and
have not yet found.  Most of the ones I've located so far cost as
much, if not more than the costs of the entire units of the above
companies.  OTS acts very suspicious when I try to purchase a
"replacement transducer".....

I've mentioned in several previous posts that I am working on this and
pretty much get silence in return so I have to wonder how many people
are actually willing to step up and "pet the pony" and actually
purchase something like this.  I couldn't even get a response as to
what people view as an acceptable price to invest in something like
this would be.  Right now, my prototype is spoken for and is being
built for Dan H. for use on Persistance.  If I don't get any feedback,
this will likely be the only pair of units I will build.

Al Secor - Electrical Engineer for IBM, Ham Radio operator callsign WA3PWX






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