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Just finished adding Ground balance to my Cibola

Cibola internal Ground Balance adjustment it does work,i have tuned mine with very good results;

I have had my Cibola for a while and have read many threads on modding and general tips for it's use. I have used it at the beach, tot lots, relic hunting, and coin shooting. I have countless hours using it. I am not an authority on it but feel quite confident on how to use it's capability to the fullest without adding or taking away from it's basic design. My unit is not covered by a warranty so I do any internal adjustments at my own risk. I think most of you have seen my vids on the Cibola "Super Tuning" and "Cibola Air Test". Those were done before I figured out how to ground balance the Cibola without adding a pot or toggle switch to it. I adjusted the inside GB trimmer while holding the PP button down and pumping the coil. I went for a neutral setting instead of pos or neg like some suggest. My soil here is red clay so it will change some from location to location. I did some air testing inside after adjusting the GB and I was impressed. The signals had to be repeatable and something most would dig. No headphones just speaker.


Disc. Iron Thresh. 1 o'clock Sens. 10 /Sens. 3 o'clock /Sens. maxed

25c 7" /8" /12"

10c 6" /7" /10"

5c 8" /9" /13"

1c 7" /8" /11"


Disc. Iron Thresh. 3 o'clock Sens10 /Sens. 3 o'clock /Sens. (TY) in Sensitivity

25c 8" /9" /13"

10c 7" /8" /11"

5c 9" /10" /14"

1c 8" /9" /12"


Sens. (TY) /Thresh. 3 o'clock /Disc. First line after Tab /Disc. Maxed

25c 11" /10"

10c 10" /8"

5c - -

1c 9" -

One last note, the higher into or above the red zone in Sens. you go the more sensitive the Cibola becomes to iron objects. Especially if they are large or heavily encrusted. That is why some people say the can't Discriminate iron out. They may be running the detector too hot.
 
RAYMOND INGRAHAM said:
to make it a little easier,tab number order its not 123

Depends upon the pot manufacturer
 
installed 50k bourn pot,[tip -tune you onboard pot to the best you can get ,when you take it of board ,read the ohms on it ,to adjust your 10 turn pot to the same,gives you a good starting point :) now to install mode switch,pin point not easy where its at...out to test this in drought sticken calif. dirt ( like brick in this drought ;0
 
hey i'm in Lancst/palmdale and while its been dry it isnt that bad....
 
ahh....Lancst/palmdale,Desert,they still have that sweet swapmeet out there ?im used to sweet farm soil....")
Fields up ere look like cracked lake beds ,used to always hit moist dir
t by 2 inches ..not no more "(
 
results today aug.7 whent out with cibola with gb mod,and pinpoint toggle.........WOW this thing is a whole new Animal ,,,coins all about 5 inches,(gravel dirt,nasty stuff ) signals very strong best 1944 wheety,this is in an old lot full with garbage ( old farm house,unforunatly front yard is 3 feet tall in weeds,will have to wait for spring)

expecting 5.75 coil today,[TIP] the best way to ground balance,if you ave any farm fields near you try balancing there
alaways doube ceck for any iron tarets to be sure its virgin soil,once you have gb set right ,HANG ON !!



now comes volume cotrol
 
Amazing what this mod does for the Cibola..................have fun, good luck on your hunts.
That 5.75 coil will be a wonderful addition. A tot lot killer
 
Hey Sven,
I could swear that I saw photo of a modded Cibola with an Auto Tune/ Manual switch somewhere. Would like to add that while I'm into the board doing the GB mod. Any help appreciated.
Roger in VA

Tek Gamma
Tesoro Cibola
BH Time Ranger
Garrett Ground Hog
Compass 99IB
Whites CM4
RS ArcherKit BFO from the 70's
 
Occupant said:
Hey Sven,
I could swear that I saw photo of a modded Cibola with an Auto Tune/ Manual switch somewhere. Would like to add that while I'm into the board doing the GB mod. Any help appreciated.
Roger in VA

Download How-to is on my website: http://www.treasurelinx.com/mods.html
 
Thanks, and I did download/print your excellent How-To for the Ground Balance with the trigger switch for Disc/All Metal mod.

However, what I am looking for is info on the Cibola's all metal tracking or auto-tune circuit. Would love to be able to turn tracking OFF. I'm sure that I saw a photo of a Cibola with a switch to do that, but cannot find it now to save me.The detector will re-tune itself far to quickly if in all metal mode and over a target for more than a couple of seconds. I suspect that something as simple as a resistor may set the tracking speed. I haven't dug into the circuit to see. Thought I would ask first if anyone else had experience with that.
Example: In pinpoint/all metal with a target near the center of the coil and coil not moving or moving very slowly, the signal quickly fades to the threshold level that was set with the Threshold control. Since I'm old and slow, it would be nice to turn that OFF so the target signal would remain till the coil was moved away.
 
Only drawback is if you then sweep at normal speed, the detector will no longer see the target in disc or all metal mode. You will be forced to sweep much slower.

On some Tesoros, changing out two 4.7uf caps to 10uf will slow down the sweep speed and add a slight amount of depth. This is one mod that has been performed by Geotech members.
I have done this mod on an older Cutlass II, non Umax. You can try it at your own risk. Be warned its easy to damage the pads and traces on the Umax circuit boards.

Your best bet is to register at the Geotech Forums and ask there. Tesoros have been a favorite detector to reverse engineer.
 
i made my pinpoint switch so it wasnt momentary,hate haveing to resqueeze every few seconds,i put in a on/on switch the unused end of switch is open so its automaticlly disc.
Today i went to a park to learn how to supertune GB ,ater that 15 coins in a area seached for 20 years,+ 1 silver ring ,im hunting just below nickel disc, most coins were 6" or deeper) three holes 12+ inches deep,i gave up need shovel,silver signal will blow your heaphones off !
take time to check this video ,i found it very help for bourn GB Control 10 turns is a lot but you can fine tune that Cibola to super hot,wasnt sure about all these mods at first,But turned out Beautiful,as for changing capacitors, i dont know ,you have to know when to stop modifing,with costs you can just buy the next model up,P.S. i have heard the Silver Umax with gb mod gets some serious depths,good luck


video recommended
https://youtu.be/kfWNo3vleRU
 
I like my Cibola with no mods so might look at this in to the future, this might sound a bit strange but in some hunting styles I like the dulled down Cibola for coins and rings with the CSC its not as chirpy as the V in some spots.

but still like the GB mod idea maybe one day when I am board "get it" :poke:

AJ
 
More experience with Bourn GB CIABLO MOD,
after much testing i found 1 set threshold 2 raise and lower coil *adj GB until tone matches theshhold sound,then set sensitivity all the way right
thats nuetral,i search at that setting (now getting old pulltabs at 11+ inches ) log setings for different areas,
some people like to set GB a little positive
Overall Reaction, im going to need a Backhoe ")))
yesterday in a worked over park, scored a 1919 wheatie- 6 inches,loud response
i can run full Disc. and still nail Quarters ,Dimes ,and Pennies...much happy
It will take a little bit to learn how to fine tune Ground Balance,gonna name my Cibola Caterpillar.."))
 
On my Modded Ciablo
Just tried 5.75 ciablo coincentric coil
Coil goes almost as deep as stock coil,dug 3 times more coins than yesterday
Disc. set just about iron,the distinct sound this coil makes when it hits a coin cant be beat,very clean sound,it just migh make default coil.
any one know how to change pitch of ciablo sound ?
 
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