OO coils for Tesoro Umax detectors

[sa1ka]

I rememebr reading about some one recently who made a OO or DD coil for a bandido II Umax. Since all of the Umax detectprs use the same coils, woudl your design work on my Deleon? IF so coudl you please answer me back. I woudl really like to try building one.

Thanks!

[Max]

I rememebr reading about some one recently who made a OO or DD coil for a bandido II Umax. Since all of the Umax detectprs use the same coils, woudl your design work on my Deleon? IF so coudl you please answer me back. I woudl really like to try building one.

Thanks!

Hi,
I think that they would be ok too on deleon. I know it works at 10KHz like bandido...but have much newer circuitry. It's a uMax too...so uMax coils would work on it. For the OO coils find the IVCONIC's posts about the topic ...
my DD is 22cm diameter 0.3 wire...120 turns for both tx and rx...but I suggest you add 10 or 20 turns to rx coil. I putted Rx coil flat on bottom of shell and then Tx over. Worked very well with bandido.
I've shielded with aluminium-mylar film...but you can use common kitchen foil too I think...without losing too much performance.

Best regards,
Max

[sa1ka]

Thanks Max!
I have acces to an LCR meter this weekend so I have to get turning. I have aluminized Mylar, foil tape or kitchen foil. Do you have a picture of your build? How big of a air gap did you leave on the coils? Does it matter where the gap is?
I will see if I can dig up IVCONICs OO posting.

[Max]

Thanks Max!
I have acces to an LCR meter this weekend so I have to get turning. I have aluminized Mylar, foil tape or kitchen foil. Do you have a picture of your build? How big of a air gap did you leave on the coils? Does it matter where the gap is?
I will see if I can dig up IVCONICs OO posting.

Hi,
yes I have a picture but already enclosed...but problem is that I haven't a picture of construction phase...I've used clear but non-transparent epoxy to seal...no way.
Anyway, I've just made two windings on a former 120T each with 0.3mm wire...then put RX coil flat on bottom of housing (that's homemade) and TX coil over i. Gap is about 2cm between the two coils in the middle. Overlap is made without making touching the shields at overlapping points. I've used tape-layer, then al-mylar layer, then again tape-layer on each coil. A bare wire was wound on each coil (in a free tape space) to give gnd connection to each shield. A small gap is needed for both shields (about 5mm if I remember well). Then the 2 wires are connected at same gnd point.
No matter where the gaps are (in theory)...I've made them near the cable connections to keep short the two bare wires...and avoid too long gnd cabling inside the housing. After cabling was done I've potted everything with epoxy.

Entire diameter of coil is 22.3cm (extern of housing). Internal diameter is near 21.6 cm. I think that these dimensions are not critical...but nulling is very important...and you need a scope to do it easy.

Best regards,
Max

[sa1ka]

Thanks for the lesson and details, I do have a scope.

Happy Hunting!

[sa1ka]

it begins

Hi,
I think that they would be ok too on deleon. I know it works at 10KHz like bandido...but have much newer circuitry. It's a uMax too...so uMax coils would work on it. For the OO coils find the IVCONIC's posts about the topic ...
my DD is 22cm diameter 0.3 wire...120 turns for both tx and rx...but I suggest you add 10 or 20 turns to rx coil. I putted Rx coil flat on bottom of shell and then Tx over. Worked very well with bandido.
I've shielded with aluminium-mylar film...but you can use common kitchen foil too I think...without losing too much performance.

Best regards,
Max

Well my measurements are in and: my TX coil reads 5.76 mH and my Rx coil reads 7.00 mH. I added 20 turns to it better to take off than add on I figured. The Tx is right on in the range from the data sheet but the Rx is about .6 to .8 mH too high, I will try it anyway.

Just out of curiosity which plug is which on the female plug of the housing?

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This is the best I can do right now.

I have covered my coils with an aluminum tape that I have. Pictures will come later if anyone is interested.

Many thanks for your input