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Re: [PSUBS-MAILIST] Home-Built Pinger
Al,
There are a lot of transducer manufactures. ITC is on the high end.
We get most of our transducers from Sensor Technology Limited in Ontario.
Mainly for price and their
willingness to do custom stuff for us.
Their web site is http://www.sensortech.ca/site/index.cfm. We do at times
use ITC, primarily for
their low kHz ducers. Yes, they are expensive.
Another company we have used in the past is airmar (http://www.airmar.com/)
Another "high end" http://www.massa.com/
If you do a search for ultrasonic transducer you may have more luck than say
underwater acoustic transducer.
We actually have a transducer that would probably work, our standard
transducer is nominally
flat around 34-41 kHz and omni-directional. We have them with a seacon
connector (MCBH2M) or a threaded stem.
We list them at $400 for the one with the connector. We generally sell them
as spares for our acoustic nav systems, but
wouldn't have a problem selling them in Qty 1. I'm not sure what the
current lead times would be.
You can probably get them direct from Sensors for less than $400. You can
also get the naked ceramic and pot it yourself. This is usually MUCH
cheaper.
One can defiantly pick up our transponder signals on the OTS systems (which
we use in the field), so they should match your application pretty well.
BTW having a pinger (or transponder) close to the same frequency as your
voice comms will drive you crazy, but at will let you
know that your pinger is working...
I can dig up the freq response and directivity if any one is interested.
Hope that helps,
-a
----- Original Message -----
From: "Al Secor" <wreckdiver@frontiernet.net>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, March 05, 2008 3:33 PM
Subject: Re: [PSUBS-MAILIST] Home-Built Pinger
Hi guys,
I've mentioned this in the past but have not been keeping the list up to
date. I have a design nearly complete and 2 prototypes being built for an
underwater comm unit with a built in beacon capability. This operates at
a frequency of 32.768 Khz USB (Upper Side Band) which is compatible with
most scuba comm units that are on the market today. My biggest stumbling
block to date is finding an affordable transducer. I've checked with
ITC, & Reson, which are two of the big transducer mfg and theirs go for
over $1000 each. A standard hydrophone will not work since they are too
broadbanded and most are not designed for transmitting. The transducer I
need should have a resonant freq of 33 Khz with of bandwith of at least
2.7 Khz and is capable of handling a transmit power of 5 watts at a duty
cycle of 20-30%.
If anyone knows of a possible source, I would appreciate any leads. I am
currently using transducers from OTS (Ocean Technology Systems) but doubt
they will sell them in anything besides service part type quantity. Maybe
Andy from Desert Star could give me some leads...(I'm not looking to do
this commercially, just as a service to PSUBS).
I also need to know what kind of price approaches the "pain threshold".
The end price (which would be at cost) would depend on quantities, pc
board costs, transducer costs, etc, but feel they could probably be built
for maybe $200 each and you would need 2, one for the sub and one for the
surface.
Let me know what you think....
Al Secor
----- Original Message -----
From: "aeg" <ag@desertstar.com>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, March 05, 2008 1:56 PM
Subject: Re: [PSUBS-MAILIST] Home-Built Pinger
Jon,
Good talking with you on the phone.
Attached is the wholesale pricing.
I let Tommy know about the psub group and that I thought it was
a good idea to offer some sort of discount to the group. He promised to
follow up
this week.
Let me know if you have any questions.
-andy
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