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Here's an interesting read @ the birth of Teknetics
Posted by: Tom_in_CA
Date: September 26, 2017 09:17AM
I recall in about '83, seeing the first ever Teknetics with target ID. Shown by a dealer at a club meeting, where he had the machine propped on a table, doing demonstrations for the 25-or-so attendees. Bear in mind, that at this time in history, all of us were accustomed to "progressive dial" discrimination . Where .... if you want to loose round tabs, you WILL ... of necessity, loose nickels and so forth. Or if you wish to loose aluminum foil, you WILL ... of necessity ... loose small gold rings. Etc....

The dealer waived a nickel. It gave a distinct tone. Then he waves a tab. It gave ANOTHER distinct and DIFFERENT tone. Then he waved a gold ring. It gave YET A 3rd DISTINCT and different tone. The crowd was spell-bound with awe ! Dollar signs appeared in all of our eyes. With images of digging gold rings till our arms fell off, while effortlessly leaving foil and tabs behind. Doh !

Naturally, as we all know, a million aluminum objects exactly mimic a million gold rings. The variations are endless, so to pick 3 random target examples was not going to show the true array of objects that appear in the field. But at the time, you can imagine how groundbreaking this was :)

For a look back at the concept invention, here's a cool legal briefing that surrounded the Whites Co. vs. creation of Teknetics. Interesting read:

https://www.leagle.com/decision/1984745677p2d681735

Re: Here's an interesting read @ the birth of Teknetics
Posted by: Dave J.
Date: September 26, 2017 12:34PM
I don't know the actual factuals relating to the core invention that made the general idea practical, that Payne said he came up with after leaving White's employ. However I can speculate based on the following:

1. In electronic circuits, multiplication and division are difficult to implement and still have them accurate over a wide dynamic range. There are ways to do it (I've done it) but the bottom line is that the various methods have limitations and we're always wishing there was a better way.

2. there's this thing we call "the Payne Circuit" which does analog division in the time domain. It was the basis of the original Teknetics target ID system and is still in use today in some of our products. The Payne Circuit is very ingenious, I'd never have thunked it up in a thousand years.

3. to my knowledge, White's has never used that circuit in any of their products. For that matter, I've never seen it anywhere other than in Payne legacy metal detector platforms.

Therefore I draw the same conclusion that the Judge did; and that the key ingredient was the Payne Circuit.

thanx Dave !
Posted by: Tom_in_CA
Date: September 26, 2017 06:34PM
Dave, thanx for your input. I love reading your post on any forum. A great contribution to the hobby, discussions, etc....

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How does George's circuit differ from thr PRG?
Posted by: vlad
Date: September 29, 2017 07:15AM
Just i.d.; as GB and motion were not in practice when the PRG emerged, from Technos Inc.around, 72?



Edited 1 time(s). Last edit at 09/29/2017 07:18AM by vlad.

Re: How does George's circuit differ from thr PRG?
Posted by: Joe(TX)
Date: November 07, 2017 01:02AM
Vlad, did you ever find a PRG?

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Re: How does George's circuit differ from thr PRG?
Posted by: vlad
Date: November 18, 2017 11:26AM
last one I heard of was in Oz

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