Nautilus revisited

[6666]

I am glad I did it as now things have disappeared from the internet due to death of each of the two owners in the past. Never quite learned the secrets, but I did it mainly to learn about what Nautilus did.

Try the wayback machine
http://archive.org/web/

[6666]

The forum is doing weird things
if you dont find what you are looking for try reading this article
https://technofizi.net/best-internet...rnative-sites/

[dbanner]

Forum dedicated to Nautilus, going back more than 10 years.
https://www.findmall.com/list.php?39,page=1

[dbanner]

Coming attractions
Layout for AT3 beachunter
Layout for gold bug 1
Layout for aquasound

[6666]

What technology is a AT3 beachunter ?

[dbanner]

VLf induction balance. It has nice bell tone sound for non ferrous metals.

[kt315]

DB

can you share your .sch file?

tia

[Melbeta]

Very interesting information there sir. Thanks for posting. Well those fine wires which loop around and are stuck down, are positioned and stuck when coil is being fine balanced. This is part of manufacture process of coil. These wires are part of bucking coil. An extra piece is left swinging before attaching the end to small pcb. Then when final balancing of coil is being done, the little piece of extra wire is moved around until null is achieved. Then it is glued down in that position. This is what I learned from various thread and documents as to construction of concentric coil. So I think that the 2b is normal concentric coil(with bucking coil) and should be relatively easy to reproduce the original coil.

DBanner, I have an question. One seeks to achieve "NULL" of the coil by moving around the last dangling null wire. So my question is, "what exactly is what one trying to do in seeking null"? Looking at the oscilloscope and seeing the lowest voltage reading? How would a person KNOW he has finally set it ON NULL? Melbeta

[Melbeta]

Forum dedicated to Nautilus, going back more than 10 years. https://www.findmall.com/list.php?39,page=1

Yes, if one has a love for the vintage detectors, one better get busy reading and saving, as just like a fart in the wind, even the smell goes away in the wind. I did get some of the old Discovery Electronics but even on Wayback, it was disappearing faster then I could read it and save it. I got some on JB website, and then it was gone. There was an original Compass forum that is now history. Do not confuse it with the current Compass forum, but it is gone today, just like Compass is gone today. Just like hash browns sizzling on the griddle, better come and get it while it is still hot, as suddenly it is done and gone. We are busy with life, then we decide we need something, and we go looking and find it is not being manufactured anymore today! BUMMER!!!!!! Melbeta

[Melbeta]

Nautilus Coil secrets.........

While you are still looking at the Nautilus coil. I read in various posts, from guys who were very familiar with Nautilus 2B coils, that one of the secrets of the Nautilus coils was it was a CO-AXIAL CONCENTRIC coil. Now not sure if that can be observed by looking at the guts inside the coil. So was it really a normal concentric coil? Or a different wound concentric coil. Remember, Compass Electronics when it made it infamous COIN MAGNUM, patented a new Co-Axial Coil? Heavier and thicker of course. Garrett then came out with his own co-axial, and even Whites Electronics came out with its own co-axial coil. DID JERRY TYNDALL come out with his own SECRET kind???

Also Compass engineers in the coil department, experimented with coating the top of the inside of the coils, coating it there, then testing the coils. Then they coated the bottom of the inside of the coils, then tested them that way. Now I am speaking of the Farraday Shield coating. They even coated both sides of the inside of the shell, and tested that way. I do not have the sheets of the testing of which way was best or not best.

Who was there on the Oregon maffic black sand beaches, working with the Compass engineers? Well one was Bruce Candy. This information came to me from one guy who is a friend of a guy who who was present on the beaches with the engineers back then.

Why did Jerry Tyndall keep his coil windings AWAY from the bottom shell? Obviously even a fraction of distance away made a lot of difference. It was a more flimsy coil of course, but George Payne used to say in the postings, hold the coil up above the ground, and it works better as far as getting rid of ground noise. Even a fraction of distance away from the magnetic black sands, makes a hell of a difference in performance!
Melbeta

[dbanner]

DB

can you share your .sch file?

tia

I solved last part of puzzle for this device. The wiring of the swiches( Search Loop Balance Switch and Non-motion disc./ ground balance disc.)
Later on I will post complete wiring diagram for all switches and pots on a single image. But for now here is the wiring for the switches. The color dots correspond to the wires on switches.
you can find the .sch file here also.

[dbanner]

While you are still looking at the Nautilus coil. I read in various posts, from guys who were very familiar with Nautilus 2B coils, that one of the secrets of the Nautilus coils was it was a CO-AXIAL CONCENTRIC coil. Now not sure if that can be observed by looking at the guts inside the coil. So was it really a normal concentric coil? Or a different wound concentric coil. Remember, Compass Electronics when it made it infamous COIN MAGNUM, patented a new Co-Axial Coil? Heavier and thicker of course. Garrett then came out with his own co-axial, and even Whites Electronics came out with its own co-axial coil. DID JERRY TYNDALL come out with his own SECRET kind???

Also Compass engineers in the coil department, experimented with coating the top of the inside of the coils, coating it there, then testing the coils. Then they coated the bottom of the inside of the coils, then tested them that way. Now I am speaking of the Farraday Shield coating. They even coated both sides of the inside of the shell, and tested that way. I do not have the sheets of the testing of which way was best or not best.

Who was there on the Oregon maffic black sand beaches, working with the Compass engineers? Well one was Bruce Candy. This information came to me from one guy who is a friend of a guy who who was present on the beaches with the engineers back then.

Why did Jerry Tyndall keep his coil windings AWAY from the bottom shell? Obviously even a fraction of distance away made a lot of difference. It was a more flimsy coil of course, but George Payne used to say in the postings, hold the coil up above the ground, and it works better as far as getting rid of ground noise. Even a fraction of distance away from the magnetic black sands, makes a hell of a difference in performance!
Melbeta

Well insofar as co-axial concentric, just looking at the photos I have of the 2b coil, it would seem that it is not a co-axial concentric. You can clearly see the smaller reciever coil in the middle which the wires are clearly seen going to small pcb where they are connected to input of preamp. From this I think it is a safe assumption that its a conventional "normal" concentric coil. But I could be wrong, you cannot be 100% sure unless you have the coil to examine in detail.

[dbanner]

Could it be that instead of a bucking coil connected in anti-phase to the Tx coil, there is a second Rx coil with smaller number of windings connected in ant- phase to Primary Rx coil?
That would make it sort of a co-axial concentric. Just a wild guess.
I intend to try to copy this device, so I'll have to cross that bridge when I get there.

[dbanner]

KT, I put schematic in .sch for you. check in zip above.

[kt315]

oops. thanks.

check schematic for netlist errors gives 'Duplicate use of C'.