Garrett Master Hunter 7 ADS frequency

[tiempwa]

As a detectorist i like to restore vintage metal detectors when i'm not in the fields searching. Most of the detectors i have from the 70's or 80's were easy to repair with documentation widely available, but Garrett got me on this one

Recently i found a Garrett Master Hunter 7. Looks brand new but came without the shaft and search coils. I didnt think finding a coil would be a problem, but i turns out to be harder than i thought.

It turns out that the later models that were made just before the 7X dont use the older 5.5khz deepseeker coils, but use the Crossfire coils. I can imagine that the Master Hunter 7 units with the Crossfire frequency are much harder to find, because they were only made in the late 80's. Calling Garrett isnt a option for me because i live in the Netherlands so i emailed them. I got the reply that Crossfire coils work on all Master Hunter 7 models. I know for a fact that is not true.

So my question: how can i tell that my Master Hunter 7 is indeed a late model capable of using Crossfire coils?

The circuit board of my ADS 7 looks like a hybrid between the older ADS circuitry and that of a 7x (the white cuircuit but with a lot of the new components, like the potmeters with the black protection)

Edit: the serial number on the stem and circuit board is 0888-019

 

[vlad]

Keith Wills
East Texas Metal Detectors
Gilmer, Texas
He repairs/sells all--even BFO's
Has parts for everything you can imagine
http://www.brokendetector.com/

 

[pan4au]

Don't know if the crossfire will work or not... I had a ADS7 and a Freedom 2 plus... I never tried the freedom 2 plus coil(crossfire on the deepseeker ads7.. Keit,h as noted in the above post, should be able to answer that.. I wouldn't think that they would work.. dunno for sure..

 

[tiempwa]

Thanks, i have sent Keith a email. But if anyone here has some info, please share

How dangerous is it really to connect a coil with a higher (or lower) frequency? Could it really fry the detector or coil?

 

[vlad]

-to the point it does not work at all, but you won't cook anything.
However I accidentally put a 15kHz loop on a 5kHz D-Tex once, and it worked just fine, no apparent loss in performance.
I checked that Crossfire loop in the garage today at buddy's house, it says ultimate Deepseeker [or some similar word.]
I think it'd work.--8"? I would not go above 10" because of some loss of resolution on very small items with bigger loops.
(count the pins in the loop plug to help identify)

 

[tiempwa]

Thanks for the info Vlad!

Tuesday i found a elliptical 10X5 Crossfire coil and since it was only 15 bucks incl. shipping i tought it was well worth the risk.

Turns out that it works! I havend tested it properly yet, only a indoor air test. but it gives proper signals and if the air test is accurate, will go pretty deep.

The only thing is that i didnt get a Coin alert signal with coins and that this machine has no volume control, it is very loud!

 

[vlad]

you may be able to turn belltone on & off. As to volume--use the headphones.
Ellipitical? Is it concentric, or a DD? I think Garrett still made a coax for it back then. Nulls from top, no emf interference &
get next to metal, like fences and still hit targets.

 

[tiempwa]

I will take a look at it today.
It is a DD coil, picture is the same as mine:

 

[pan4au]

That's a great price for that coil. The ears on my 8" broke.. I'm going to have to fix it or find another if I want to use the Freedom 2 plus

 

[vlad]

similar to this if you see one someplace....
http://compass-metal-detector-forum.548136.n2.nabble.com/file/n7595923/Garrett_0003.jpg

 

[doc holiday232]

similar to this if you see one someplace....
http://compass-metal-detector-forum.548136.n2.nabble.com/file/n7595923/Garrett_0003.jpg

The first "stacked" coil was orange---deepest Garrett ever.

 

[doc holiday232]

As a detectorist i like to restore vintage metal detectors when i'm not in the fields searching. Most of the detectors i have from the 70's or 80's were easy to repair with documentation widely available, but Garrett got me on this one

Recently i found a Garrett Master Hunter 7. Looks brand new but came without the shaft and search coils. I didnt think finding a coil would be a problem, but i turns out to be harder than i thought.

It turns out that the later models that were made just before the 7X dont use the older 5.5khz deepseeker coils, but use the Crossfire coils. I can imagine that the Master Hunter 7 units with the Crossfire frequency are much harder to find, because they were only made in the late 80's. Calling Garrett isnt a option for me because i live in the Netherlands so i emailed them. I got the reply that Crossfire coils work on all Master Hunter 7 models. I know for a fact that is not true.

So my question: how can i tell that my Master Hunter 7 is indeed a late model capable of using Crossfire coils?

The circuit board of my ADS 7 looks like a hybrid between the older ADS circuitry and that of a 7x (the white cuircuit but with a lot of the new components, like the potmeters with the black protection)

Edit: the serial number on the stem and circuit board is 0888-019

I used a "Hot Head" coil on my Master Hunter and it was about 20% deeper than the stock coil.--

 

[pan4au]

As a detectorist i like to restore vintage metal detectors when i'm not in the fields searching. Most of the detectors i have from the 70's or 80's were easy to repair with documentation widely available, but Garrett got me on this one

Recently i found a Garrett Master Hunter 7. Looks brand new but came without the shaft and search coils. I didnt think finding a coil would be a problem, but i turns out to be harder than i thought.

It turns out that the later models that were made just before the 7X dont use the older 5.5khz deepseeker coils, but use the Crossfire coils. I can imagine that the Master Hunter 7 units with the Crossfire frequency are much harder to find, because they were only made in the late 80's. Calling Garrett isnt a option for me because i live in the Netherlands so i emailed them. I got the reply that Crossfire coils work on all Master Hunter 7 models. I know for a fact that is not true.

So my question: how can i tell that my Master Hunter 7 is indeed a late model capable of using Crossfire coils?

The circuit board of my ADS 7 looks like a hybrid between the older ADS circuitry and that of a 7x (the white cuircuit but with a lot of the new components, like the potmeters with the black protection)

Edit: the serial number on the stem and circuit board is 0888-019

I had one and tried it on my ads-7.. The HH was as good as my stock coil. I may have gotten a bad coil. I just recently bought a 7X, I haven't got to hunt with it yet..


I used a "Hot Head" coil on my Master Hunter and it was about 20% deeper than the stock coil.--

 

[vlad]

-its best feature is being shielded in such a way as to block EMI from the top,
& metal from the sides, to some extent-but its not as deep as a concentric. I used them on both the Deepseeker with just a retune,
and also the ADS model with mode switch.
And at some point Garrett ceased manufacture of the large donut. (I'm not sure if he continued it with his current sharp-shooters)

https://c1.staticflickr.com/4/3763/33157673372_745de214d6_o.jpg

 

[LS hunter]

I started out qith the ads 3 then the ads 7. Then the 7x not sure if rhere any different i also had the 10x and man it was a gold and silver finder.....Gotta love rhem old Garretts..