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The "iron eliminator" was an aftermarket device....
Posted by: vlad
Date: May 13, 2019 05:12AM
I believe Whites bought the rights to it (message Monte here--or try to contact Jimmy Sierra Normandi, pretty sure they can fill in the blanks.)
It slewed the ground balance out of tune but it would allow some see-through of conductors among iron, though depth was not extreme. (Just for a specific situation,
sort of like a Compass 100kHz unit in iron but maybe more efficient)
And post on the Main Comparison Forum (where Whites posts are most often seen.)
:detecting:

Re: The "iron eliminator"
Posted by: Tom_in_CA
Date: May 13, 2019 07:04PM
I remember that . It was an object, about the size of a cigar tube, that you ground balanced your detector to. To fool it into thinking that iron was a part of the ground matrix, thus sort of seeing-through-nails. The maker advertised no loss of depth, and continued ability to get TID's. But :

a ) he was wrong about the no-loss-of-depth claim. You did indeed loose depth by a lot. You had to operate the coil swing in a similar way to the all TR-disc.: To hit the retune button just slightly off the ground. And then "scrub" fashion detecting, careful not to raise your loop.

b) The TID would continue to give read-outs, HOWEVER, it would not give the correct TID for objects that were masked. You would get a beep to hint at something conductive. But were not getting a correct TID.

c) IMHO : A person was better off simply getting an old 77b, than to fool with that iron-eliminator gadget.

Re: The "iron eliminator"
Posted by: rluka
Date: May 14, 2019 12:18AM
Quote
vlad
I believe Whites bought the rights to it (message Monte here--or try to contact Jimmy Sierra Normandi, pretty sure they can fill in the blanks.)
It slewed the ground balance out of tune but it would allow some see-through of conductors among iron, though depth was not extreme. (Just for a specific situation,
sort of like a Compass 100kHz unit in iron but maybe more efficient)
And post on the Main Comparison Forum (where Whites posts are most often seen.)
:detecting:

Lots of interesting info here about detectors from the past... Thanks for all that info


Quote
Tom_in_CA
I remember that . It was an object, about the size of a cigar tube, that you ground balanced your detector to. To fool it into thinking that iron was a part of the ground matrix, thus sort of seeing-through-nails. The maker advertised no loss of depth, and continued ability to get TID's. But :

a ) he was wrong about the no-loss-of-depth claim. You did indeed loose depth by a lot. You had to operate the coil swing in a similar way to the all TR-disc.: To hit the retune button just slightly off the ground. And then "scrub" fashion detecting, careful not to raise your loop.

b) The TID would continue to give read-outs, HOWEVER, it would not give the correct TID for objects that were masked. You would get a beep to hint at something conductive. But were not getting a correct TID.

c) IMHO : A person was better off simply getting an old 77b, than to fool with that iron-eliminator gadget.



Minelab CXT3030, Gray Ghost underwater headphones, Garrett Pro-Pointer
<><><><><><><>
PAST DETECTORS
Whites 6000D
Whites Eagle llSL90
Whites MXT
Explorer ll
Excalibur ll
Explorer SE,15 inch WOT, 12x10 SEF, Sun Ray Stealth X-8, Sun Ray Stealth X-5, Sun Ray X-1 Target probe

Re: RE: Whites Eagle IISL (1989)
Posted by: rluka
Date: May 22, 2019 03:23PM
Hope you can help....it turns out that the battery pack was rebuilt with 1.2v NIMH batteries. Thats probably why it was overheating.
Can the 509 - 0020 charger used for this?
Thanks for all your help
Ron L


Quote
J-ROB
I suspect that battery pack is no good, drawing too much current, overheating the charger.



Minelab CXT3030, Gray Ghost underwater headphones, Garrett Pro-Pointer
<><><><><><><>
PAST DETECTORS
Whites 6000D
Whites Eagle llSL90
Whites MXT
Explorer ll
Excalibur ll
Explorer SE,15 inch WOT, 12x10 SEF, Sun Ray Stealth X-8, Sun Ray Stealth X-5, Sun Ray X-1 Target probe

Re: RE: Whites Eagle IISL (1989)
Posted by: Tom_in_CA
Date: May 23, 2019 02:07AM
Quote
J-ROB
..... When I think back on the dozens of detectors that I have owned over the years, the old Eagle II SL stands proud among them. It was a point in the development of detector technology that was -- and still is -- a good place to be.

Ditto. That was one of my favorite machines as well. Except mine was the '90, not the '89. The last incarnation got the 950 loop (with the hole in the center) and the black box. A good land machine, but it wasn't too good for wet salt beaches.

Various machines now spank it for depth. But during its era, it was a fun machine.

Re: RE: Whites Eagle IISL (1989)
Posted by: J-ROB
Date: May 23, 2019 07:56AM
Quote
rluka
Hope you can help....it turns out that the battery pack was rebuilt with 1.2v NIMH batteries. Thats probably why it was overheating.
Can the 509 - 0020 charger used for this?

NiMH batteries are more complex to charge than Nicads as used in the original White's rechargeables.

Short answer is NO, I would not use a White's wall wart charger to recharge NiMH batteries. They need a smarter charger with control over charging current.

Easiest way out would be to rebuild again with sub C size Nicads. Or buy NiMH batteries and an appropriate charger. IKEA has nice 2450mah AA batteries for less than $10 a four pack. You could use these with AA to C adapters as discussed above.

Or buy 100 packs of bulk alkaline AAs for cheap. 100 AAs with get you through a couple dozen hunts for reasonable outlay.

If excessive heat is noticed in any battery charging activity, best thing is to stop right there! Exploding batteries are no fun!

Re: RE: Whites Eagle IISL (1989)
Posted by: rluka
Date: May 23, 2019 09:04PM
I'm lucky that there is very little mineralization here where I live so I get good depth and very little problems running at the highest sensitivity. I have to CTX3030 for the salt beaches and hi mineral areas.

Quote
Tom_in_CA
Quote
J-ROB
..... When I think back on the dozens of detectors that I have owned over the years, the old Eagle II SL stands proud among them. It was a point in the development of detector technology that was -- and still is -- a good place to be.

Ditto. That was one of my favorite machines as well. Except mine was the '90, not the '89. The last incarnation got the 950 loop (with the hole in the center) and the black box. A good land machine, but it wasn't too good for wet salt beaches.

Various machines now spank it for depth. But during its era, it was a fun machine.



Minelab CXT3030, Gray Ghost underwater headphones, Garrett Pro-Pointer
<><><><><><><>
PAST DETECTORS
Whites 6000D
Whites Eagle llSL90
Whites MXT
Explorer ll
Excalibur ll
Explorer SE,15 inch WOT, 12x10 SEF, Sun Ray Stealth X-8, Sun Ray Stealth X-5, Sun Ray X-1 Target probe

Re: RE: Whites Eagle IISL (1989)
Posted by: rluka
Date: May 23, 2019 09:06PM
In the process of getting it rebuilt with NiCads
Ron L

Quote
J-ROB
Quote
rluka
Hope you can help....it turns out that the battery pack was rebuilt with 1.2v NIMH batteries. Thats probably why it was overheating.
Can the 509 - 0020 charger used for this?

NiMH batteries are more complex to charge than Nicads as used in the original White's rechargeables.

Short answer is NO, I would not use a White's wall wart charger to recharge NiMH batteries. They need a smarter charger with control over charging current.

Easiest way out would be to rebuild again with sub C size Nicads. Or buy NiMH batteries and an appropriate charger. IKEA has nice 2450mah AA batteries for less than $10 a four pack. You could use these with AA to C adapters as discussed above.

Or buy 100 packs of bulk alkaline AAs for cheap. 100 AAs with get you through a couple dozen hunts for reasonable outlay.

If excessive heat is noticed in any battery charging activity, best thing is to stop right there! Exploding batteries are no fun!



Minelab CXT3030, Gray Ghost underwater headphones, Garrett Pro-Pointer
<><><><><><><>
PAST DETECTORS
Whites 6000D
Whites Eagle llSL90
Whites MXT
Explorer ll
Excalibur ll
Explorer SE,15 inch WOT, 12x10 SEF, Sun Ray Stealth X-8, Sun Ray Stealth X-5, Sun Ray X-1 Target probe

Re: RE: Whites Eagle IISL (1989)
Posted by: J-ROB
Date: May 23, 2019 11:18PM
Quote
rluka
I'm lucky that there is very little mineralization here where I live so I get good depth and very little problems running at the highest sensitivity. I have to CTX3030 for the salt beaches and hi mineral areas.

/quote]


I ran my Eagle SL a lot in Central TX where the soil was very mild limestone, mostly. I felt like I had 6-8 inches under control and there didn't seem to be much deeper than that. 8-10" down was hardpan caliche in many places locally.

Trust me, there are a lot of places in Texas where you just about need dynamite to dig 10" through that rock hard stuff!! :blink:

I found that EMI was more of an impediment to jacking up the sensitivity than the soil, but I could usually run at 4 out of 5.


Re: RE: Whites Eagle IISL (1989)
Posted by: J-ROB
Date: May 25, 2019 09:12AM
Quote
J-ROB
Quote
rluka
I'm lucky that there is very little mineralization here where I live so I get good depth and very little problems running at the highest sensitivity. I have to CTX3030 for the salt beaches and hi mineral areas.

/quote]


I ran my Eagle SL a lot in Central TX where the soil was very mild limestone, mostly. I felt like I had 6-8 inches under control (with 600 coil) and there didn't seem to be much deeper than that. 8-10" down was hardpan caliche in many places locally.

Trust me, there are a lot of places in Texas where you just about need dynamite to dig 10" through that rock hard stuff!! :blink:

I found that EMI was more of an impediment to jacking up the sensitivity than the soil, but I could usually run at 4 out of 5.


avatar
From what I recall NIMH & Nicad are both 1.2 volts (others...)
Posted by: vlad
Date: May 26, 2019 06:13AM
and stay at that voltage a very long time. Alkaline are 1.5 volts and once alkaline batteries discharge to 50% capacity, it's delivering a lower voltage than a rechargeable.
The problem with Nicads is they can develop a memory (at a certain point where a good charge remains--they stop discharging) and they have a tendency to reverse polarity too.
(Some units when switching from alkaline to rechargeables need more rechargeables to work--a ML Sovereign is this way.)
In the end NIMHs are a better deal than alkaline because they can be charged around 1000X. A good "smart charger" is inexpensive and will even work with alkalines (set them aside after
though to see if they leak. Also another variety, Rechargeable Alkalines (RAM) -- higher voltage + long shelf life. But have a short cycle life (can't be charged as many times as a real rechargeable) Capacity (and sometimes voltage) is reduced on every cycle. Doesn't work in high-drain devices
Do NOT recharge acid types like Hvy Duty as ever time I've tried they leaked. All rechargeables lose their charge over time through self-discharge even when not in a device. This can be up to 30% per month. So a battery is never fully charged when you go to use it , unless you keep it on constant trickle charge. Newer type NiMh batteries hold a charge for longer,( Low Self-Discharge) LSD. version; lithium-ion cells have very low self-discharge, ( and alkalines will store the charge a long time too.) and not available in standard voltage, except for 9V size (AAA, AA, C, and D-size Li-ion put out 3.7V instead of 1.5V.) You better have a voltage regulator or some circuits may be fried.
I cannot say that Nicad/NiMH will not leak, I've just never seen it happen. (Steer clear of some Chinese types because they seldom live up to advertising; batteries here have a guarantee that
if they leak they will repair or replace----foreign batteries may be a different proposition altogether.)
A newer type is NiZn (Nickel-Zinc) that has higher voltage (1.65V+); if you use a high drain device these might be good, but a voltage regulator may be necessary to protect electronics.
*** Whites does offer NiMH chargers.



Edited 1 time(s). Last edit at 05/26/2019 06:16AM by vlad.

Re: RE: Whites Eagle IISL (1989)
Posted by: Sweeping-4-junk
Date: January 02, 2020 01:09PM
Do you know at what voltage using alkaline or zincs the SL90 will work down to safely before a battery change is needed. This detector really sucks my zincs flat in no time at all. Alkaline cost a fortune so i might be going for
re-chargeable batts soon...

Re: RE: Whites Eagle IISL (1989) ( forjunk )
Posted by: Flintstone
Date: January 02, 2020 04:14PM
I broke down and got 4 rechargeable C cells for my 90sl. I can hunt about 5 hr. before I get tired and quit, and still have a lot of power left. I think I could get at least 10hrs. if I need to. I then just put them back in the charger and good to go again. You can get them on the big board just look under rechargeable batteries.