Two Box

[Wiltran]

Is the two-box technology such that you could build one that would go down about 2.5 feet ( past the 30 year strata). it could have discrimination but that would not be essential. Possibly be a VLF using maybe TGSL technology? With this you could locate small jars etc.

[mikebg]

Is the two-box technology such that you could build one that would go down about 2.5 feet ( past the 30 year strata). it could have discrimination but that would not be essential. Possibly be a VLF using maybe TGSL technology? With this you could locate small jars etc.

Hi Wiltran.
For small jars you need small loops.
You're now more than one year participant in this forum, so I hope you have read this:

http://www.geotech1.com/forums/showt...ighlight=boxxx

Note that there are two different definitions of the term "two box":

1. Orthogonal or almost orthogonal loop configuration. In this case the RX and TX coils are fixed in induction balance, ie the mutual inductance remains minimal and stabile. The coil configuration is suitable also for PI metal detectors. In this case the term "two box" is misleading, but the configuration operates excellent even in BFO metal detectors.

2. The transmitter and receiver are two separate boxes, ie the mutual inductance between RX and TX coils changes randomly in searching process because two operators make searching. In other case the transmitter box is placed on the earth, but the mutual inductance changes when the operator moves the RX box.

[Qiaozhi]

Possibly be a VLF using maybe TGSL technology?

The TGSL is a motion detector, and is not suitable for conversion to a 2-box design.

[Wiltran]

Thanks MikeBG and Qiuozi for the replys! It seems that the current state of the technology dead ends at about 1-1.5 foot in the ground for coins and small objects. I was wondering if a orthogonal type of MD would be possible to extend this range to possibly 2 feet for coins and small objects?