[aprssig] A question for an electronic design tech./ engineer

david vanhorn kc6ete at gmail.com
Sat Sep 22 11:37:03 EDT 2012

Ok, that adds some complication.
I've done underwater metal detectors.

I would be VERY tempted to change from analog circuitry to a processor, and
use magnetic reed switches for tuning. That can work through a permanently
sealed case.  Battery charging can be done inductively, but all
rechargeables have a finite lifetime.  Anything with seals though, is
problematic. Pressure isn't an issue, the casing can be filled with mineral
oil and then it will go deeper than you will without a JIM suit.

On Sat, Sep 22, 2012 at 9:30 AM, <AA3JY at winlink.org> wrote:

> ..additional criteria: be able to with stand down to 4 ATM's, neutral to
> slightly neg. buoyancy, small able to be held in one hand.
> https://sites.google.com/site/kendiver/PingerConstruction1.pdf
> Clay AA3JY
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