uh-oh....almost forgot...i'm working on a new 1260-X project....

[chuck]

i'm getting help from one of my electronics teachers in college to try and make 1260-x more powerful and even deeper.
he has a theory about amplifying the transmit signal coming from the coil.i told him i really wanted to boost it,but try and keep it stable at the same time.anyone else ever try this,or have an idea on any other theories that would make it go deeper ? .......HH......chuck

[Chris]

Re: uh-oh....almost forgot...i'm working on a new 1260-X project....

Hi Chuck

Of course....many people & companies try to "boost" their detectors to go deeper for more than 30 years....but the deep penetration depends mostly on soil conditions & detector technics (PI, VLF) etc. Check out www.minelab.com there you can find info (DVT, MPS & FBS) in which direction you should go with your design ideas. But this is for PI detectors and not for VLF's like your 1260-X. Maybe you can adopt some of their technologies for your VLF design project. Keep us updated. I'm sure all in the forum are interested in the out come.

Regards
Chris

[JC]

more power

Hi Chris,

There are two straight forward ways of getting the detector to go deeper. Increase xmit power or increase receiver gain, simply stated. The problem you run into on vlf detectors is that the nulling of the search coil becomes a driving factor in this. Because of capacitive and inductive coupling of the xmit coil and rec coil in different ways depending on how they are wound you may find it difficult to make a really well nulled coil set that the gain (xmit or rec) can be cranked up on too much. However, that said you can probably improve on the original design some as manufacturers have to leave some wide room for manufacturing tolerances (sloppyness). Which you can improve on some for a single unit (yours). Increasing the xmit power is preferable to the rec gain as the rec gain will receive more external noise, to deal with, however either one will make it more sensitive.

If you increase the power with the commerical coil set you will probably find the integrators in the circuit will saturate due to the "un-nulled signal" and the detector will quit working.

This may be part of the reason why you don't see more vlfs with 4 lb lead acid batteries like minelab pulse units.

JC

[JC]

whoops meant chuck!!

Just got up and need more coffee.