[PSUBS-MAILIST] 32 kHz U/W Comm. Std.

["Jens Laland" <laland@artematrix.org>]

Jon

> Given that ABS standardized on 32khz, I'm a bit surprised that we are
> having such a hard time finding suppliers with 32khz centered
> transducers. I think it is worth contacting ABS to find out "what
> gives?" on this standard. One would assume they didn't randomly select
> 32khz.

I have seen this 32 kHz mentioned a lot in relation to underwater
communication, and it often turns out to be a conversational short form
for the more specific frequency 32.768 kHz [32,768 Hz].

This frequency are almost exclusively used in clocks and watches, and the
reason the 32,768 Hz resonator has become so common is due to a compromise
between the large physical size of low frequency crystals for watches and
the large current drain of high frequency crystals, which reduces the life
of the watch battery.

Given that this clock crystal goes for about $0.1 per item (in wholesales)
on eBay, also says something about the availability and why it is used as
a standard in most underwater communication systems.

Best regards,
Jens Laland




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