Garrett Master Hunter Coil Details

[Goaty]

I was recently given this Garrett VLF/TR Deepseeker to to see if I could get it working but unfortunately all the owner had was the control box ? no coil or shaft.





A search of this forum soon turned up a circuit diagram which seemed to be a close match (thanks!) and before long I had it emitting a continuous beep when switched on, so I am hopeful that it may now work. The problem is that I do not have a suitable coil to test it with. I searched the forum again for coil details but could find nothing other than mention of a co-planar coil. Further searching on the web did not come up with any useful information so I am appealing here for any details and help. I am quite prepared to have a go at building a coil if I can get some info to get started as I have built quite an assortment of PI machines and see this as a good learning opportunity with this type of detector.


As can be seen from the photos it is a Garrett ADS VLF/TR Deepseeker ?Master Hunter?

[Carl-NC]

Your best bet is to find a compatible coil. Keith Wills (http://brokendetector.com) has a bunch of old coils, or eBay.

[Goaty]

Thanks Carl. I have been watching ebay for a while but without coil specs I don't know what would be suitable. Also the high cost of freight from the US to Aus is a bit of a deal breaker for a detector of this age. I'm just treating it as a learning exercise and not prepared to spend too much on it at this stage .

[ivconic]

Few weeks ago i decided to clean and rearrange the "scrapyard" in my addict.
Surprisingly and strangely enoguh; i discovered several ruined detectors that i totally forgot there!
Winter, annoyance, so i started to reverse ee this one:










So far i did this:

[ivconic]

Neither one of the coils have connector, all cut off and God knows where those are.
I took round coil and tried to measure it, it has 4 wires and shielding.
So:
Red-Black = 6.3ohms/1.32mH
White-Green = can't measure, probably some component in series ... or broken.

Haven't tried yet to measure those "2box" coils. Will do these days.
Although i think it would be with obstacles too, there are some switches on those coils,
probably some "electronics" inside and probably will prevent accurate readings.
I don't feel kinda good about cutting and opening those coils... at least not yet.

[ivconic]

For those who can't open Sprint Layout files:

[Op04]

Thank you Sir Ivconic many many thanks for the knowledge you've been sharing for years. Regards

[ivconic]

Thank you Sir Ivconic many many thanks for the knowledge you've been sharing for years. Regards

Usually it is somebody's else knowledge disclosed partially or completely by me.
So the main credit goes to original authors, of course.
But i know the feeling, i still remember how it was in the past when one could not find even most trivial fact, info, schematic... on this subject.
It was bitter experience. To want to learn but not having from where to learn.
In the old "good" (bad) dial-up days; i used to spend several hours to download one simple patent article...
... with very skim explanations and nonsense sketches... along with incomplete parts of schematic.
"Good" old days... the hell with them!

[profesor]

for garret master hunter.
crossfire coil information:
TX 2.382mH 0.67mmAL 30cm diameter 55 turns.
RX 1.5mH 0.55mmCu diameter ? I did not measure.
TX 2 156uH 13 turns 0.67mmAL
green wire 390k - pole.
white tx coil driver tip
380k resistor between tx 1 tx2

[sinclairuser]

Few weeks ago i decided to clean and rearrange the "scrapyard" in my addict.
Surprisingly and strangely enoguh; i discovered several ruined detectors that i totally forgot there!
Winter, annoyance, so i started to reverse ee this one:

[ATTACH]56382[/ATTACH]
[ATTACH]56383[/ATTACH]
[ATTACH]56384[/ATTACH]
[ATTACH]56385[/ATTACH]
[ATTACH]56386[/ATTACH]
[ATTACH]56387[/ATTACH]
[ATTACH]56388[/ATTACH]
[ATTACH]56389[/ATTACH]

So far i did this:

thanks ivica maybe this could be made into an interesting project, re done with modern components and a plastic enclosure, when i started messing with detectors it was early designs like this, i found they work really well, the main drawback with detectors like this is how heavy the were.
that is something we can work on today.
i still love a non motion analogue machine, the other problem is its a garrett design, and they can be a bit snotty about their stuff even stuff this old.

[profesor]

corosfıre.PDF

[ivconic]

thanks ivica maybe this could be made into an interesting project, re done with modern components and a plastic enclosure, when i started messing with detectors it was early designs like this, i found they work really well, the main drawback with detectors like this is how heavy the were.
that is something we can work on today.
i still love a non motion analogue machine, the other problem is its a garrett design, and they can be a bit snotty about their stuff even stuff this old.

Exactly my thoughts, since i have it laying in a dust; i thought to give it a try. Integrated circuits on this one are with skrathced labels, most of those i am not sure about. But i think it would not be a problem to "decypher" them.
I had to stop for a while with works on it, due other responsibilities, but for sure i intend to continue. And as it progress i will post here new things.

[ivconic]

[ATTACH]56397[/ATTACH]

That's usefull info, thanks!

[Qiaozhi]

This might be useful.

[ivconic]

This might be useful.