TESORO GOLDEN SABRE

[sdesic]

TGSL EDU with 27 cm DD coil works good but it has some rusty iron problems.
It finds old rusty iron and it beeps regularly in disc mode (set to disc out most of iron)
when I dig it up then it is not audible target... is there any solution for this ?

Pinpointing with big coil is also problem.
Sometimes I think all metal pinpoint is in one place and disc in other ... difference of 20-30 cm sometimes.

All metal is too sensitive to small peaces of iron ... can be corrected by lowering sensitivity (and loosing some depth)

Started building concentric coil but I am stuck at winding busking coil over...
Used 0.2 mm enameled wire so I had to change no. of laps.... and need info on measurements TX and RX are as should be 6.5 and 6.0mH.
Bucking coil is x mH ?

[Gwil]

Have you seen this article?

http://www.geotech1.com/cgi-bin/page...anar/index.dat

Gwil

[Silver Dollar]

sdesic if your RX is 1/2 diameter of TX then the Buck is 1/4 the number of turns of the TX.

So if you used 80 turns for TX then use 20 for the buck. I think it's around .2 mh, it will subtract .2 from
the TX so I use 6.0 for TX then it drops to 5.8 when buck is in line.

I found you should use thicker wire for the TX and buck or your TX amplitude will suffer. I used .5 mm on TX and buck
and .25 mm on RX.

[sdesic]

Have you seen this article?

http://www.geotech1.com/cgi-bin/page...anar/index.dat

Gwil

I have Don's manual for building concentric coil.
But there is no inductivity for bucking coil.
http://www.geotech1.com/forums/showt...373#post164373

sdesic if your RX is 1/2 diameter of TX then the Buck is 1/4 the number of turns of the TX.

So if you used 80 turns for TX then use 20 for the buck. I think it's around .2 mh, it will subtract .2 from
the TX so I use 6.0 for TX then it drops to 5.8 when buck is in line.

I found you should use thicker wire for the TX and buck or your TX amplitude will suffer. I used .5 mm on TX and buck
and .25 mm on RX.

I have some detection but don't know how effective is bucking coil...
Don't know no. of turns as I added few so it would be up to 6.0 and 6.5mH

[Silver Dollar]

It's nearly impossible to keep a certain inductance you can only keep it close.

The buck is added until the RX goes to minimum so keep adding wire until it
is the smallest it gets...

[paku]

what is big difference 2N2222, 2N2907 plastic one and metal one

[Koala]

what is big difference 2N2222, 2N2907 plastic one and metal one

"plastic one and metal one" none as far as I can see. The metal can type were more reliable but both are the same now.

be careful the pin outs are different between the metal and plastic.

be careful where you get the pin outs from. There is at least one site on the web that has the wrong pin out for the plastic 2N2222 I found out the hard way. Much better to pull the original data sheet.

[paku]

yes kola. thanks for remind now i build success TGSL Its Very Good
need to read many time to understand on this forum hahahah
Im start make TGSL Years of 2012
Now 2015 The success Hahahah Take To Long Time For newbies like me
i dont have expert tools like oscilloscope
all make manual

my engineer say if you want be wise
what you looking that is you tools for use
Hahaha fun

[jladre]

Hi everyone.. i been wondering if how many percent will be lost in the real ground compare in air test depth?

[paku]

Hi everyone.. i been wondering if how many percent will be lost in the real ground compare in air test depth?

bring out you tgsl and test

[jladre]

Im a little upset .... in air test i got 27cm on 50cent silver us dollar but when i buried at about 10cm in soil i no longer detect it.

[Koala]

Depends on your ground and settings.

I use a the IDX


One nice dry sand I loose virtually nothing


Most ground I loose about 25%


on ground with a lot of coke in it. If I move the ground balance to stop the coke sounding I am getting about 50%


On a wet beach where I have to turn the threshold down I am only getting the the top few inches.

Try with the discrimination turned right down.

Try something other than silver do you get the same bad results

Try adjusting the ground balance. Mine prefers to be slightly positive.

Try in all metal mode are the results the same or better


I am sure we can turn that frown upside down

[jladre]

Depends on your ground and settings.

I use a the IDX


One nice dry sand I loose virtually nothing


Most ground I loose about 25%


on ground with a lot of coke in it. If I move the ground balance to stop the coke sounding I am getting about 50%


On a wet beach where I have to turn the threshold down I am only getting the the top few inches.

Try with the discrimination turned right down.

Try something other than silver do you get the same bad results

Try adjusting the ground balance. Mine prefers to be slightly positive.

Try in all metal mode are the results the same or better


I am sure we can turn that frown upside down

Thanks koala my friend.. i will try tommorow.

[Silver Dollar]

Yes your ground balance will greatly affect silver depth. Try a bit of gold for a better test...

[siimkuningas]

Ordered EDU kit, hope to get it working faster than paku did Good reading here, thanks for that.